Search for resonant diboson production in the $\ell\ell q\bar{q}$ final state in pp collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector

arXiv:1409.6190v2 [hep-ex] 19 Mar 2015

EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)

CERN-PH-EP-2014-211

Submitted to: EPJC

Search for resonant diboson production in the

ℓℓq ¯

q

final state in

pp

collisions at

√s = 8

TeV with the ATLAS detector

The ATLAS Collaboration

Abstract

This paper reports on a search for narrow resonances in diboson production in the

ℓℓq ¯

q

final state

using

pp

collision data corresponding to an integrated luminosity of

20

fb

_{collected at}

√

_{s = 8 TeV}

with the ATLAS detector at the Large Hadron Collider. No significant excess of data events over the

Standard Model expectation is observed. Upper limits at the 95% confidence level are set on the

production cross section times branching ratio for Kaluza–Klein gravitons predicted by the Randall–

Sundrum model and for Extended Gauge Model

W

_{bosons. These results lead to the exclusion of}

mass values below 740 GeV and 1590 GeV for the graviton and

W

_{boson respectively.}

c

2018 CERN for the benefit of the ATLAS Collaboration.

(will be inserted by the editor)

Search for resonant diboson production in the ℓℓq ¯

q final state

in pp collisions at

√s = 8 TeV with the ATLAS detector

ATLAS Collaboration

1

Received: date / Accepted: date

Abstract This paper reports on a search for narrow

resonances in diboson production in the ℓℓq ¯q final state

using pp collision data corresponding to an integrated

luminosity of 20 fb−1 _{collected at}√_{s = 8 TeV with the}

ATLAS detector at the Large Hadron Collider. No sig-nificant excess of data events over the Standard Model expectation is observed. Upper limits at the 95% confi-dence level are set on the production cross section times branching ratio for Kaluza–Klein gravitons predicted by the Randall–Sundrum model and for Extended Gauge

Model W′ _{bosons. These results lead to the exclusion}

of mass values below 740 GeV and 1590 GeV for the

graviton and W′ _{boson respectively.}

1 Introduction

This paper presents a search for narrow diboson reso-nances in the semileptonic decay channel ZW or ZZ →

ℓℓq ¯q (where ℓ stands for electron or muon) in pp

colli-sion data corresponding to an integrated luminosity of

20 fb−1 _{recorded with the ATLAS detector at a}

centre-of-mass energy√s = 8 TeV at the Large Hadron

Coll-ider (LHC). This type of resonances appear in models such as Technicolor [1–3], Warped Extra Dimensions [4– 6], and Grand Unified Theories [7–10]. The semilep-tonic decay channel has a relatively large branching ratio compared to the fully leptonic mode, while the requirement of the presence of two decay leptons can suppress the multijet background present in the fully hadronic mode. Additionally, the absence of neutrinos in the final state allows to reconstruct the invariant mass of the diboson system.

This analysis is optimized using two models with narrow resonances as benchmarks: spin-2 Kaluza–Klein

(KK) gravitons (G∗_{→ ZZ), and spin-1 W}′_{gauge bosons}

(W′_{→ ZW ) of the Sequential Standard Model (SSM)}

with modified coupling to ZW , also referred to as the Extended Gauge Model (EGM) [11]. For both models, the W and Z bosons from resonance decays are longi-tudinally polarized over a pole mass range relevant to this analysis.

The KK graviton interpretation is based on an ex-tended Randall–Sundrum (RS) model with a warped extra dimension in which the Standard Model (SM) fields can propagate [12]. This extended “bulk” RS model avoids constraints on the original RS model [4], referred to as RS1 hereafter, from limits on flavour-changing neutral currents and from electroweak precision tests. The bulk RS model is characterized by a dimensionless

coupling constant k/ ¯MPl∼ 1 where k is the curvature

of the warped extra dimension and ¯MPl = MPl/

√ 8π is the reduced Planck mass. The width relative to the

mass of the bulk RS graviton with k/ ¯MPl = 1 varies

between 3% and 6% within the pole mass range of 300– 2000 GeV.

The EGM introduces W′ _{and Z}′ _{bosons with SM}

couplings to fermions and with the coupling strength

of the heavy W′ _{to W Z modified by a mixing factor}

ξ = c×(mW/mW′)2relative to the SM couplings, where

mW and mW′ are the pole masses of the W and W′

bosons respectively, and c is a coupling scaling factor.

In this scenario the partial width of the W′ _{boson to}

W Z scales linearly with mW′, leading to a narrow

res-onance over the accessible mass range, in contrast to

the SSM where the width grows rapidly as m5

W′. For

the simulated EGM W′ _{samples used in the analysis,}

the natural W′ _{width is about 3% at a pole mass of}

300 GeV and increases slightly to 4% at a pole mass of 2000 GeV.

Previous searches for diboson resonances have been

the Tevatron and pp collision data at √s = 7–8 TeV at the LHC. The D0 Collaboration searched for res-onances in W W and ZW production [13, 14] and

ex-cluded W′ _{bosons in the mass range of 180–690 GeV}

and RS1 gravitons in the mass interval 300–754 GeV at the 95% confidence level (CL). The CDF experiment searched for resonances in the ZZ decay channel and set limits on the production cross section of RS1 gravitons in the mass range 300–1000 GeV at the 95% CL [15]. The ATLAS Collaboration reported searches for

reso-nant ZZ (→ ℓℓℓ′_ℓ′_{, ℓℓq ¯q) [16], W W (→ ℓνq¯q) [17] and}

W Z (→ ℓνq¯q, ℓνℓ′_ℓ′_{) [17, 18] production, and searches}

for new phenomena in high-mass W W (→ ℓνℓ′_ν′₎

pro-cesses [19] using pp collision data recorded at √s =

7 TeV, except for the W Z → ℓνℓ′_ℓ′ _{search in Ref. [18],}

which used data recorded at√s = 8 TeV. Here ℓ′_stands

for an electron or muon. These studies excluded EGM

W′ _{bosons with masses up to 1.52 TeV for W Z final}

states, RS1 gravitons with masses up to 845 GeV for ZZ final states and up to 1.23 TeV for W W final states. The CMS Collaboration searched for ZZ and W W res-onances in the semileptonic decay channel, setting ex-clusion limits on the production cross section of bulk RS gravitons [20]. In the fully hadronic channel, the CMS

Collaboration excluded RS1 gravitons with k/ ¯MPl=0.1

for masses up to 1.2 TeV, and W′ _{bosons for masses up}

to 1.7 TeV [21]. Both of these searches implement jet substructure techniques to identify the event topology where the hadronic system from the decay of one or two gauge bosons is produced at high transverse

momen-tum pT, resulting in a single reconstructed jet. In the

analysis presented here, a similar technique has been used to identify hadronically decaying W or Z boson

produced at high pT. This technique uses the

charac-teristics of two cores (“subjets”) inside a single recon-structed jet and allows for a significant improvement in acceptance and selection efficiency for high mass states with boosted W and Z bosons over the previous anal-ysis [16].

2 Analysis

In this study, three optimized sets of selection criteria classify ZW/ZZ → ℓℓq¯q events into distinct kinematic

regions, namely the “low-pTresolved region” (LR),

“high-pT resolved region” (HR) and “merged region” (MR),

based on the pT of the dilepton and the hadronic

sys-tem. In the LR and HR the hadronic boson decay is reconstructed as two distinct jets, whereas in the MR it is reconstructed as a single jet. In all three cases, the dilepton (hadronic system) mass is required to be con-sistent with the mass of the Z boson (W or Z boson).

In the MR, additional jet substructure information, op-timized for the identification of the hadronic decay of a

longitudinally polarized high-pT boson, is used to

im-prove the sensitivity. Finally, the ℓℓq ¯q mass spectrum,

reconstructed as the mass of the dilepton and the

two-jet system in the LR and HR (mℓℓjj) or the dilepton

and the single-jet system in the MR (mℓℓJ), is

exam-ined for excesses with respect to the expectation from SM processes (background).

2.1 Detector and data sample

The ATLAS detector [22] consists of an inner detector (ID) providing charged particle tracking for the

pseu-dorapidity1 _{range |η| < 2.5, surrounded by a}

supercon-ducting solenoid, electromagnetic and hadronic calorime-ters with a coverage of |η| < 4.9, and a muon spectrom-eter (MS) with toroidal magnets that provides muon identification in the range |η| < 2.7.

This study uses an integrated luminosity of 20.3 fb−1

of pp collision data collected in 2012. The luminosity is derived from beam-separation scans [23] and has an uncertainty of 2.8%. Events are selected with lepton triggers that require the presence of at least one lepton

(electron or muon) with pT above 24 GeV. The trigger

efficiency for signal events that pass the selection crite-ria described in Sect. 2.3 is approximately 92% for the muon channel and greater than 99% for the electron channel.

2.2 Simulated event samples

To model the acceptance and the reconstructed mass spectra for narrow resonances, benchmark signal sam-ples are generated with pole masses between 300 and 2000 GeV, in 100 GeV steps. Additional samples are

generated between 350 and 950 GeV for the bulk RS G∗

signal so that the mass gap is reduced to 50 GeV, which is comparable to the detector resolution of the

recon-structed ℓℓq ¯q mass in this mass interval. The bulk RS

G∗_{signal events are generated by CalcHEP [24] with}

k/ ¯MPl = 1.0, and the W′ signal sample is generated

with Pythia 8 [25], setting the coupling scale factor c = 1. The factorization and renormalization scales are set to the resonance mass. The hadronisation and frag-mentation are modelled with Pythia 8 in both cases,

1

ATLAS uses a right-handed coordinate system with the z-axis along the beam pipe. The x-z-axis points to the centre of the LHC ring, and the y-axis points upward. Cylindrical co-ordinates (R,φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle θ as η = − ln(tan(θ/2)).

Table 1 Theoretical production cross section times branch-ing ratio σG∗(pp → G∗) · BR(G∗→ZZ) with k/ ¯MPl = 1.0

and σW′(pp → W′) · BR(W′→ZW ) with c = 1 for different

pole masses of the resonances.

Pole mass [GeV] σG∗·BR [fb] σW′·BR [fb]

500 540 4100

800 23 540

1400 0.44 33

and the CTEQ6L1 [26] (MSTW2008LO [27]) parton

distribution functions (PDFs) are used for the G∗_(W′₎

signal. The W′ _{production cross section is scaled to a}

next-to-next-to-leading-order (NNLO) calculation in αs

by ZWprod [28]. Calculated production cross section times branching ratio values for different pole masses are given in Table 1.

The main background sources are Z bosons pro-duced in association with jets (Z+jets), followed by top-quark pair and non-resonant vector-boson pair produc-tion. The contribution from multijet events is negligible after the selection cuts described in Sect. 2.3. All back-ground estimates are based on simulation. Addition-ally, the main background source, Z + jets, is estimated using constraints from data as described in Sect. 2.4. The Z + jets background is modelled by the Sherpa generator [29] with CT10 PDFs [30]. The top pair, s-channel single-top and W t processes are modelled by the MC@NLO [31] generator with CT10 PDFs, inter-faced to Herwig [32] for hadronisation and Jimmy [33] for modelling of the underlying event. The top pair pro-duction cross section is calculated at NNLO in QCD including resummation of next-to-next-to-leading loga-rithmic soft gluon terms with Top++2.0 [34–39]. The t-channel single-top events are generated by AcerMC [40] with CTEQ6L1 PDFs and Pythia 6 [41] for hadroni-sation. The diboson events are produced with the

Her-wig _{generator and CTEQ6L1 PDFs. The diboson}

pro-duction cross sections are normalized to predictions at next-to-leading-order accuracy as calculated with [42]. Generated events are processed with the ATLAS de-tector simulation program [43] based on the GEANT4 package [44]. Effects from additional inelastic pp inter-actions (pile-up) occurring in the same bunch cross-ing are taken into account by overlaycross-ing minimum-bias events simulated by Pythia 8.

2.3 Object and event selection

Electron candidates are selected from energy clusters in the electromagnetic calorimeter according to the medium criteria of Ref. [45], which impose requirements on the

shower profile and demand an associated ID track.

Off-line reconstructed electrons are required to have pT>

25 GeV and |η| < 2.47. The transition region between the barrel and endcaps (1.37 < |η| < 1.52) exhibits degraded energy resolution and is therefore excluded.

Muon candidates are reconstructed by combining ID and MS tracks which have consistent position, charge and momentum measurements [46]. The muon

candi-dates are required to have pT> 25 GeV and |η| < 2.4.

A primary vertex reconstructed from at least three well-reconstructed charged particle tracks, each with

pT > 400 MeV, is required in order to remove

non-collision background. If an event contains more than one primary vertex candidate, the vertex with the

high-est Σp2Tof the associated tracks is selected. To ensure

that both electrons or muons originate from the pri-mary vertex, it is required that the product of the

longi-tudinal impact parameter (z0) and the sine of the polar

angle of the candidate (θ) satisfies |z0sin(θ)| < 0.5 mm,

and that the ratio of the transverse impact

parame-ter (d0) to its uncertainty (σd0) for electrons (muons)

fulfils |d0|/σd0 < 6 (3.5). In addition, the lepton

can-didates are required to be isolated from other tracks and calorimetric activity. The scalar sum of the trans-verse momenta of tracks within a cone of size ∆R ≡

p(∆η)2_{+ (∆φ)}2 _{= 0.2 around the lepton track is}

re-quired to be less than 15% of the candidate pT.

Simi-larly, the sum of transverse energy deposits in the calorime-ter within a cone of size ∆R = 0.2, excluding the trans-verse energy due to the lepton, and corrected for the ex-pected pile-up contribution, is required to be less than

30% of the candidate pT(calorimetric isolation).

To improve the acceptance for events with boosted

Z bosons, with pT> 800 GeV, the isolation method is

modified for dilepton objects: a dilepton track isolation variable is calculated for each lepton of a like-flavour

pair by subtracting the pT of the paired lepton from

the pT sum described above if it falls inside the

isola-tion cone of the lepton under consideraisola-tion. The

mod-ified scalar sum pT variable for the dilepton isolation

is required to be less than 15% of the lepton pT, as in

the standard track isolation. The calorimetric isolation requirements are dropped if ∆R(ℓℓ) < 0.25.

Jets are reconstructed from clusters of calorimeter

cells using the anti-kt algorithm [47] with a distance

parameter R = 0.4. Jets are required to be in the

range |η| < 2.1 and to have pT > 30 GeV after

cor-recting for energy losses in passive material, the non-compensating response of the calorimeter and extra en-ergy due to event pile-up [48]. Furthermore, for jets with

pT < 50 GeV, the scalar sum pT of associated tracks

from the primary vertex is required to be at least 50%

jets from pile-up interactions. The selected anti-ktjets

are referred to as small-R jets and denoted by “j” here-after.

For resonances with a mass above about 900 GeV,

the q ¯q pair is often merged into a single jet and the

fraction of merged q ¯q pairs increases with the resonance

mass. Such jets are reconstructed with the Cambridge– Aachen jet clustering algorithm [49] with a distance pa-rameter R = 1.2. To exploit the characteristics of the

decay of the massive boson into a q ¯q pair, these jets

are further required to pass a splitting and filtering al-gorithm similar to the alal-gorithm described in Ref. [50]

but optimized for the identification of very high-pT

bo-son decays [51]. These jets are required to be within

|η| < 1.2 and to have pT> 100 GeV, and are referred

to as large-R jets or “J” hereafter.

Events which contain exactly two electrons or muons satisfying the above criteria are selected if at least one is associated with a lepton trigger candidate. To select lepton pairs originating from a Z boson decay, the

dilep-ton invariant mass (mℓℓ) is required to be in the range

66 GeV < mℓℓ < 116 GeV. The mℓℓ cut range is

cho-sen to be wide to enhance the signal cho-sensitivity, given that the dominant background is from the Z + jets pro-cesses and a narrower cut would not provide additional discrimination power. Muon-pair events are further re-quired to have muons of opposite charge. The oppo-site charge requirement is not required for electron-pair events because of a higher charge misidentification rate

for high-pTelectrons.

The three selection regions are differentiated by the

pTranges for the leptonic Z decay candidate (pℓℓT) and

hadronic jet system, namely pℓℓ

T > 400 GeV and pJT >

400 GeV for the large-R jet in the MR, and pℓℓ

T > 100

(250) GeV and pjj_T > 100 (250) GeV for the two

small-R jets at low (high) pT in the LR (HR). The mass of

the hadronic jet system is required to be in the range

70 GeV < mjj/J < 110 GeV for both the hadronic

W and Z decay candidates in all three regions. In the MR, the large-R jet is split into subjets using an al-gorithm described in Ref. [50]. However, in contrast to the configuration used in Ref. [50], the mass relation between the large-R jet and subjets, the mass drop, is not imposed. A subjet momentum balance variable

is defined as √yf = min(pj1T, p

j2

T)∆R12/m12, where pj1T

and pj2_T are the transverse momenta of the two

lead-ing subjets, ∆R12 is their separation and m12 is their

mass. To suppress jets from gluon radiation and split-ting, the subjet momentum balance is required to be

√_y

f> 0.45. Events are classified by sequentially

apply-ing the criteria for the MR, HR, and LR, thus assignapply-ing each event exclusively to one region. Overall, the signal acceptance times efficiency after all selection

require-ments increases from 5–10% at mG∗ = 300 GeV to a

plateau of 30–35% above mG∗ = 500 GeV for a signal

sample of G∗ _{→ ZZ → ℓℓq¯q. The improvement in}

ac-ceptance compared to the previous analysis [16] ranges up to a factor of five for masses above 1.5 TeV.

2.4 Background and event yield

The simulation of the main background source (Z+jets)

is corrected using data. The normalization and mℓℓjj/J

shape corrections of the simulated Z + jets background sample is determined from data in a control region de-fined by all selection cuts but with an inverted cut on

mjj/J, namely mjj/J < 70 GeV or mjj/J > 110 GeV, in

the resolved and merged regions, respectively. The nor-malization corrections, obtained as the ratio of event yields in the data and Z + jets simulated samples for the electron and muon channel, after removing contri-butions from subdominant backgrounds from the data

spectrum, range between 2% and 10%. The mℓℓjj/J

shape correction is well reproduced with a linear fit to the ratio of data to Z + jets background, derived for each signal region after combining the electron and muon channels. This results in bin-by-bin corrections of up to 7% in the LR, 3% in the HR, and 22% in the MR. The other backgrounds, from diboson and top production, are taken from simulation without applying corrections from data control regions.

The event yield in the three signal regions is sum-marized in Table 2. The total event yield with combined statistical and systematic uncertainties is given before and after the simultaneous fit to the three signal regions (cf. Sect. 3).

2.5 Systematic uncertainties

The main systematic uncertainty on the mℓℓjj/J

spec-trum comes from the uncertainty in the Z + jets back-ground modelling. The normalization uncertainty of the Z + jets background is estimated from the relative dif-ference between the normalization corrections derived

from the nominal control region (mjj/J < 70 GeV or

> 110 GeV) and either the lower or higher mass re-gion, taking the larger of the two as an estimate of the systematic uncertainty. If the resulting uncertainty is smaller than the statistical uncertainty of the normal-ization correction from the nominal control region, the latter is used as the systematic uncertainty. The un-certainty of the shape correction is estimated from the uncertainty on the slope parameter of the linear fit and is treated as uncorrelated with respect to the normal-ization uncertainty. The combined normalnormal-ization and

Table 2 Event yields in signal regions for data, expected backgrounds, and G∗_{and W}′_{signals. The statistical and systematic}

uncertainties are given separately (in this order), except for the total background where the combined statistical and systematic uncertainty before (unconstrained) and after (constrained) the fit to the data in the signal regions is shown. The signal mass points correspond to 500 (LR), 800 (HR), 1400 (MR) GeV.

Sample LR HR MR Z + jets 9460 ± 40 ± 660 591 ± 4 ± 15 20.9 ± 0.3 ± 2.3 W W/W Z/ZZ 234 ± 4 ± 22 20.6 ± 0.3 ± 1.4 1.38 ± 0.02 ± 0.13 t¯t + Single t 175.3 ± 9.2 ± 9.9 - -Total (unconstrained) 9870 ± 690 612 ± 17 22.3 ± 2.5 Total (constrained) 9730 ± 98 608.8 ± 3.8 21.80 ± 0.46 Data 9728 619 25 G∗_{Signal 1097 ± 17 ± 63 14.27 ± 0.19 ± 0.76 0.0995 ± 0.0013 ± 0.0059} W′_{Signal 1950 ± 40 ± 140 145.0 ± 2.3 ± 8.1 3.64 ± 0.06 ± 0.31}

shape uncertainties vary as a function of mℓℓjj/J and

range from 6% to 9% in the LR, 2% to 8% in the HR, and 11% to 47% in the MR. For all simulated samples, detector performance-related systematic uncertainties including the small-R jet energy scale and resolution, large-R jet energy, mass and momentum-balance scales and resolutions, the lepton reconstruction and identi-fication efficiencies, and lepton momentum scales and resolutions are also considered. The large-R jet energy and mass scale uncertainties are evaluated by compar-ing the ratio of calorimeter-based to track-based mea-surements in dijet data and simulated events, and are

validated using a data sample of high-pTW bosons

pro-duced in association with jets. A Kolmogorov–Smirnov (KS) test [52] is then performed between the nomi-nal and systematically varied distributions for a given systematic uncertainty source to determine if it has a sizeable effect on the shape of background and signal estimations. Only significant systematic effects are re-tained in the analysis by requiring a KS probability of less then 10%. For the normalization, if the event yield changes by more than half the statistical uncertainty of the nominal yield, the systematic uncertainty is in-cluded.

Uncertainties on signal acceptance due to PDF sets, renormalization and factorization scale choices, initial-and final-state gluon radiation (ISR/FSR) modelling, and LHC beam energy uncertainty are also considered. The PDF uncertainties are estimated by taking the ac-ceptance difference between CTEQL1 and MSTW2008LO PDFs and adding it in quadrature to the difference be-tween MSTW2008LO error sets. The uncertainties due to the scale and ISR/FSR modelling are estimated by varying relevant parameters in Pythia 8 by a factor of 2.0 and 0.5. The beam energy systematic uncertainty is assessed with simulation by varying the beam energy within the measured uncertainty of 0.66% [53], leading

to at most a 1% effect on acceptance. The dominant uncertainty comes from ISR/FSR modelling and is ap-proximately 5%.

3 Results

The invariant mass of the diboson system is recon-structed from the ℓℓjj or ℓℓJ system. The reconrecon-structed mℓℓjj/Jdistributions for data and simulated background

events in the three signal regions are shown in Fig. 1 for the combined electron and muon channels. Good agreement is observed between the data and the

back-ground predictions, with p-values2 _{ranging from 0.98}

to 0.10, and the results are presented as 95% confi-dence level upper limits on the production cross

sec-tion times branching ratio for the G∗ _{and W}′ _models.

The upper limits are determined using the CLS

modi-fied frequentist formalism [54] with a profile likelihood test statistic [55]. The test statistic is evaluated with a maximum likelihood fit of signal models and

back-ground predictions to the reconstructed mℓℓjj/J

spec-tra shown in Fig. 1. Systematic uncertainties and their correlations are taken into account as nuisance parame-ters with Gaussian constraints. The likelihood fit, which takes into account correlations between the systematic uncertainties, is performed for signal pole masses rang-ing between 300–850 GeV for the LR, 550–1800 GeV for the HR and 800–2000 GeV for the MR. Overlap-ping regions are fit simultaneously.

Fig. 2 shows 95% CL upper limits on the produc-tion cross secproduc-tion times branching fracproduc-tion into ZZ or ZW as a function of the resonance pole mass. The

the-oretical predictions for the EGM W′ _{and the bulk RS}

G∗ _{with two different values of the coupling constant,}

2

The p-value is the probability that the background can pro-duce a fluctuation greater than or equal to the excess observed in data.

0 500 1000 1500 2000 2500 Events / GeV -4 10 -3 10 -2 10 -1 10 1 10 2 10 3 10 4 10 5 10 Data Z+jets ZZ/ZW/WW +Single Top t t Sys+Stat Uncertainty G*, m=500 GeV 10.0 × Nominal σ ATLAS = 8 TeV s -1 L dt = 20.3 fb ∫ Res. Region T Low-p Channel µ µ ee, → Z [GeV] lljj m 0 500 1000 1500 2000 2500 Data / BG 0.60.8 1 1.2 1.4 0 500 1000 1500 2000 2500 Events / GeV -4 10 -3 10 -2 10 -1 10 1 10 2 10 3 10 Data Z+jets ZZ/ZW/WW +Single Top t t Sys+Stat Uncertainty G*, m=800 GeV 10.0 × Nominal σ ATLAS = 8 TeV s -1 L dt = 20.3 fb ∫ Res. Region T High-p Channel µ µ ee, → Z [GeV] lljj m 0 500 1000 1500 2000 2500 Data / BG 0.60.8 1 1.2 1.4 0 500 1000 1500 2000 2500 Events / GeV -4 10 -3 10 -2 10 -1 10 1 Data Z+jets ZZ/ZW/WW +Single Top t t Sys+Stat Uncertainty G*, m=1400 GeV 10.0 × Nominal σ ATLAS = 8 TeV s -1 L dt = 20.3 fb ∫ Merged Region Channel µ µ ee, → Z [GeV] llJ m 0 500 1000 1500 2000 2500 Data / BG 0 1 2 3 4

Fig. 1 Reconstructed ℓℓjj or ℓℓJ mass distributions in the data and for background after all the selection cuts are ap-plied in the three kinematic regions referred to as the LR (top), HR (middle) and MR (bottom) in the text. The shaded regions show the full background uncertainty obtained by adding statistical and systematic uncertainties in quadrature, including the constraints on the background from the data control regions and before the fit to the data in the signal re-gions (cf. unconstrained case in Table 2). Also shown are the G∗_{signal yields expected for masses of 500, 800 and 1400 GeV}

with the production cross sections scaled by a factor 10.

shown in the figure, allow the extraction of observed (expected) lower mass limits of 1590 (1540) GeV for

the W′_{, and 740 and 540 (700 and 490) GeV for the}

G∗ _{with k/ ¯MPl = 1.0 and 0.5 respectively. The most}

powerful search regions are the LR for masses below 550 GeV, the HR from 500 to 850 GeV and the MR for higher masses. [GeV] G* m 400 600 800 1000 1200 1400 1600 1800 2000 ZZ) [pb] → BR(G* × G*) → (pp σ -3 10 -2 10 -1 10 1 10 2 10 ATLAS_{s = 8 TeV} -1 L dt = 20.3 fb ∫ = 1 Pl M Bulk RS graviton k/ = 0.5 Pl M Bulk RS graviton k/ Expected 95% CL Observed 95% CL uncertainty σ 1 ± uncertainty σ 2 ± [GeV] W’ m 400 600 800 1000 1200 1400 1600 1800 2000 ZW) [pb] → BR(W’ × W’) → (pp σ -3 10 -2 10 -1 10 1 10 2 10 ATLAS_{s = 8 TeV} -1 L dt = 20.3 fb ∫ EGM W’, c = 1 Expected 95% CL Observed 95% CL uncertainty σ 1 ± uncertainty σ 2 ±

Fig. 2 Observed and expected 95% CL upper limits on the cross section times branching fraction as a function of the res-onance pole mass for the G∗_{(top) and EGM W}′ _(bottom).

The LO (NNLO) theoretical cross sections for G∗_{(EGM W}′₎

production with k/ ¯MPl= 0.5 and 1.0 (c = 1) are also shown.

The band around the W′ _{cross section represents the}

theo-retical uncertainty on the NNLO calculation. The inner and outer bands on the expected limits represent ±1σ and ±2σ variations respectively.

4 Conclusion

In summary, a search for narrow, heavy resonances pro-duced in pp collisions and decaying to diboson final states at the Large Hadron Collider has been performed. The data sample analysed, corresponding to an

inte-grated luminosity of 20 fb−1_at√_{s = 8 TeV, was recorded}

with the ATLAS detector. No significant excess over the Standard Model background expectation was found. Upper limits on the production cross section times

branch-ing ratio and mass exclusion limits are derived for W′

Gauge Model and for gravitons in warped extra di-mensions in the context of the bulk Randall–Sundrum model. The results represent a significant improvement over previously reported limits by ATLAS [16] due to increased pp collision energy and data set size as well as the development of new techniques to analyse heavily boosted decays of bosons.

Acknowledgements We thank CERN for the very success-ful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently.

We acknowledge the support of ANPCyT, Argentina; Yer-PhI, Armenia; ARC, Australia; BMWFW and FWF, Aus-tria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colom-bia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Nor-way; MNiSW and NCN, Poland; GRICES and FCT, Portu-gal; MNE/IFA, Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZˇS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America.

The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Den-mark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.

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The ATLAS Collaboration

G. Aad84_{, B. Abbott}112_{, J. Abdallah}152_{, S. Abdel Khalek}116_{, O. Abdinov}11_{, R. Aben}106_{, B. Abi}113_,

M. Abolins89_{, O.S. AbouZeid}159_{, H. Abramowicz}154_{, H. Abreu}153_{, R. Abreu}30_{, Y. Abulaiti}147a,147b_,

B.S. Acharya165a,165b,a_{, L. Adamczyk}38a_{, D.L. Adams}25_{, J. Adelman}177_{, S. Adomeit}99_{, T. Adye}130_,

T. Agatonovic-Jovin13a_{, J.A. Aguilar-Saavedra}125a,125f_{, M. Agustoni}17_{, S.P. Ahlen}22_{, F. Ahmadov}64,b_,

G. Aielli134a,134b_{, H. Akerstedt}147a,147b_{, T.P.A. ˚Akesson}80_{, G. Akimoto}156_{, A.V. Akimov}95_{, G.L. Alberghi}20a,20b_,

J. Albert170_{, S. Albrand}55_{, M.J. Alconada Verzini}70_{, M. Aleksa}30_{, I.N. Aleksandrov}64_{, C. Alexa}26a_,

G. Alexander154_{, G. Alexandre}49_{, T. Alexopoulos}10_{, M. Alhroob}165a,165c_{, G. Alimonti}90a_{, L. Alio}84_{, J. Alison}31_,

B.M.M. Allbrooke18, L.J. Allison71, P.P. Allport73, J. Almond83, A. Aloisio103a,103b, A. Alonso36, F. Alonso70,

C. Alpigiani75_{, A. Altheimer}35_{, B. Alvarez Gonzalez}89_{, M.G. Alviggi}103a,103b_{, K. Amako}65_,

Y. Amaral Coutinho24a_{, C. Amelung}23_{, D. Amidei}88_{, S.P. Amor Dos Santos}125a,125c_{, A. Amorim}125a,125b_,

S. Amoroso48_{, N. Amram}154_{, G. Amundsen}23_{, C. Anastopoulos}140_{, L.S. Ancu}49_{, N. Andari}30_{, T. Andeen}35_,

C.F. Anders58b_{, G. Anders}30_{, K.J. Anderson}31_{, A. Andreazza}90a,90b_{, V. Andrei}58a_{, X.S. Anduaga}70_,

S. Angelidakis9_{, I. Angelozzi}106_{, P. Anger}44_{, A. Angerami}35_{, F. Anghinolfi}30_{, A.V. Anisenkov}108,c_{, N. Anjos}125a_,

A. Annovi47_{, A. Antonaki}9_{, M. Antonelli}47_{, A. Antonov}97_{, J. Antos}145b_{, F. Anulli}133a_{, M. Aoki}65_,

L. Aperio Bella18_{, R. Apolle}119,d_{, G. Arabidze}89_{, I. Aracena}144_{, Y. Arai}65_{, J.P. Araque}125a_{, A.T.H. Arce}45_,

J-F. Arguin94_{, S. Argyropoulos}42_{, M. Arik}19a_{, A.J. Armbruster}30_{, O. Arnaez}30_{, V. Arnal}81_{, H. Arnold}48_,

M. Arratia28_{, O. Arslan}21_{, A. Artamonov}96_{, G. Artoni}23_{, S. Asai}156_{, N. Asbah}42_{, A. Ashkenazi}154_,

B. ˚Asman147a,147b_{, L. Asquith}6_{, K. Assamagan}25_{, R. Astalos}145a_{, M. Atkinson}166_{, N.B. Atlay}142_{, B. Auerbach}6_,

K. Augsten127_{, M. Aurousseau}146b_{, G. Avolio}30_{, G. Azuelos}94,e_{, Y. Azuma}156_{, M.A. Baak}30_{, A.E. Baas}58a_,

C. Bacci135a,135b_{, H. Bachacou}137_{, K. Bachas}155_{, M. Backes}30_{, M. Backhaus}30_{, J. Backus Mayes}144_,

E. Badescu26a_{, P. Bagiacchi}133a,133b_{, P. Bagnaia}133a,133b_{, Y. Bai}33a_{, T. Bain}35_{, J.T. Baines}130_{, O.K. Baker}177_,

P. Balek128_{, F. Balli}137_{, E. Banas}39_{, Sw. Banerjee}174_{, A.A.E. Bannoura}176_{, V. Bansal}170_{, H.S. Bansil}18_,

L. Barak173_{, S.P. Baranov}95_{, E.L. Barberio}87_{, D. Barberis}50a,50b_{, M. Barbero}84_{, T. Barillari}100_{, M. Barisonzi}176_,

T. Barklow144_{, N. Barlow}28_{, B.M. Barnett}130_{, R.M. Barnett}15_{, Z. Barnovska}5_{, A. Baroncelli}135a_{, G. Barone}49_,

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F. Bauer137_{, H.S. Bawa}144,f_{, M.D. Beattie}71_{, T. Beau}79_{, P.H. Beauchemin}162_{, R. Beccherle}123a,123b_{, P. Bechtle}21_,

H.P. Beck17_{, K. Becker}176_{, S. Becker}99_{, M. Beckingham}171_{, C. Becot}116_{, A.J. Beddall}19c_{, A. Beddall}19c_,

S. Bedikian177_{, V.A. Bednyakov}64_{, C.P. Bee}149_{, L.J. Beemster}106_{, T.A. Beermann}176_{, M. Begel}25_{, K. Behr}119_,

C. Belanger-Champagne86_{, P.J. Bell}49_{, W.H. Bell}49_{, G. Bella}154_{, L. Bellagamba}20a_{, A. Bellerive}29_{, M. Bellomo}85_,

K. Belotskiy97_{, O. Beltramello}30_{, O. Benary}154_{, D. Benchekroun}136a_{, K. Bendtz}147a,147b_{, N. Benekos}166_,

Y. Benhammou154_{, E. Benhar Noccioli}49_{, J.A. Benitez Garcia}160b_{, D.P. Benjamin}45_{, J.R. Bensinger}23_,

K. Benslama131_{, S. Bentvelsen}106_{, D. Berge}106_{, E. Bergeaas Kuutmann}167_{, N. Berger}5_{, F. Berghaus}170_,

J. Beringer15_{, C. Bernard}22_{, P. Bernat}77_{, C. Bernius}78_{, F.U. Bernlochner}170_{, T. Berry}76_{, P. Berta}128_,

C. Bertella84_{, G. Bertoli}147a,147b_{, F. Bertolucci}123a,123b_{, C. Bertsche}112_{, D. Bertsche}112_{, M.I. Besana}90a_,

G.J. Besjes105, O. Bessidskaia Bylund147a,147b, M. Bessner42, N. Besson137, C. Betancourt48, S. Bethke100,

W. Bhimji46_{, R.M. Bianchi}124_{, L. Bianchini}23_{, M. Bianco}30_{, O. Biebel}99_{, S.P. Bieniek}77_{, K. Bierwagen}54_,

J. Biesiada15_{, M. Biglietti}135a_{, J. Bilbao De Mendizabal}49_{, H. Bilokon}47_{, M. Bindi}54_{, S. Binet}116_{, A. Bingul}19c_,

C. Bini133a,133b_{, C.W. Black}151_{, J.E. Black}144_{, K.M. Black}22_{, D. Blackburn}139_{, R.E. Blair}6_{, J.-B. Blanchard}137_,

T. Blazek145a_{, I. Bloch}42_{, C. Blocker}23_{, W. Blum}82,∗_{, U. Blumenschein}54_{, G.J. Bobbink}106_,

V.S. Bobrovnikov108,c_{, S.S. Bocchetta}80_{, A. Bocci}45_{, C. Bock}99_{, C.R. Boddy}119_{, M. Boehler}48_{, T.T. Boek}176_,

J.A. Bogaerts30_{, A.G. Bogdanchikov}108_{, A. Bogouch}91,∗_{, C. Bohm}147a_{, J. Bohm}126_{, V. Boisvert}76_{, T. Bold}38a_,

V. Boldea26a_{, A.S. Boldyrev}98_{, M. Bomben}79_{, M. Bona}75_{, M. Boonekamp}137_{, A. Borisov}129_{, G. Borissov}71_,

M. Borri83_{, S. Borroni}42_{, J. Bortfeldt}99_{, V. Bortolotto}135a,135b_{, K. Bos}106_{, D. Boscherini}20a_{, M. Bosman}12_,

H. Boterenbrood106, J. Boudreau124, J. Bouffard2, E.V. Bouhova-Thacker71, D. Boumediene34, C. Bourdarios116,

N. Bousson113_{, S. Boutouil}136d_{, A. Boveia}31_{, J. Boyd}30_{, I.R. Boyko}64_{, I. Bozic}13a_{, J. Bracinik}18_{, A. Brandt}8_,

G. Brandt15_{, O. Brandt}58a_{, U. Bratzler}157_{, B. Brau}85_{, J.E. Brau}115_{, H.M. Braun}176,∗_{, S.F. Brazzale}165a,165c_,

B. Brelier159_{, K. Brendlinger}121_{, A.J. Brennan}87_{, R. Brenner}167_{, S. Bressler}173_{, K. Bristow}146c_{, T.M. Bristow}46_,

D. Britton53_{, F.M. Brochu}28_{, I. Brock}21_{, R. Brock}89_{, C. Bromberg}89_{, J. Bronner}100_{, G. Brooijmans}35_,

T. Brooks76_{, W.K. Brooks}32b_{, J. Brosamer}15_{, E. Brost}115_{, J. Brown}55_{, P.A. Bruckman de Renstrom}39_,

T. Buanes14_{, Q. Buat}143_{, F. Bucci}49_{, P. Buchholz}142_{, R.M. Buckingham}119_{, A.G. Buckley}53_{, S.I. Buda}26a_,

I.A. Budagov64_{, F. Buehrer}48_{, L. Bugge}118_{, M.K. Bugge}118_{, O. Bulekov}97_{, A.C. Bundock}73_{, H. Burckhart}30_,

S. Burdin73_{, B. Burghgrave}107_{, S. Burke}130_{, I. Burmeister}43_{, E. Busato}34_{, D. B¨uscher}48_{, V. B¨uscher}82_,

P. Bussey53_{, C.P. Buszello}167_{, B. Butler}57_{, J.M. Butler}22_{, A.I. Butt}3_{, C.M. Buttar}53_{, J.M. Butterworth}77_,

P. Butti106_{, W. Buttinger}28_{, A. Buzatu}53_{, M. Byszewski}10_{, S. Cabrera Urb´an}168_{, D. Caforio}20a,20b_{, O. Cakir}4a_,

P. Calafiura15_{, A. Calandri}137_{, G. Calderini}79_{, P. Calfayan}99_{, R. Calkins}107_{, L.P. Caloba}24a_{, D. Calvet}34_,

S. Calvet34_{, R. Camacho Toro}49_{, S. Camarda}42_{, D. Cameron}118_{, L.M. Caminada}15_{, R. Caminal Armadans}12_,

S. Campana30_{, M. Campanelli}77_{, A. Campoverde}149_{, V. Canale}103a,103b_{, A. Canepa}160a_{, M. Cano Bret}75_,

J. Cantero81_{, R. Cantrill}125a_{, T. Cao}40_{, M.D.M. Capeans Garrido}30_{, I. Caprini}26a_{, M. Caprini}26a_,

M. Capua37a,37b_{, R. Caputo}82_{, R. Cardarelli}134a_{, T. Carli}30_{, G. Carlino}103a_{, L. Carminati}90a,90b_{, S. Caron}105_,

E. Carquin32a_{, G.D. Carrillo-Montoya}146c_{, J.R. Carter}28_{, J. Carvalho}125a,125c_{, D. Casadei}77_{, M.P. Casado}12_,

M. Casolino12_{, E. Castaneda-Miranda}146b_{, A. Castelli}106_{, V. Castillo Gimenez}168_{, N.F. Castro}125a_,

P. Catastini57_{, A. Catinaccio}30_{, J.R. Catmore}118_{, A. Cattai}30_{, G. Cattani}134a,134b_{, J. Caudron}82_{, V. Cavaliere}166_,

D. Cavalli90a_{, M. Cavalli-Sforza}12_{, V. Cavasinni}123a,123b_{, F. Ceradini}135a,135b_{, B.C. Cerio}45_{, K. Cerny}128_,

A.S. Cerqueira24b_{, A. Cerri}150_{, L. Cerrito}75_{, F. Cerutti}15_{, M. Cerv}30_{, A. Cervelli}17_{, S.A. Cetin}19b_{, A. Chafaq}136a_,

D. Chakraborty107_{, I. Chalupkova}128_{, P. Chang}166_{, B. Chapleau}86_{, J.D. Chapman}28_{, D. Charfeddine}116_,

D.G. Charlton18_{, C.C. Chau}159_{, C.A. Chavez Barajas}150_{, S. Cheatham}86_{, A. Chegwidden}89_{, S. Chekanov}6_,

S.V. Chekulaev160a_{, G.A. Chelkov}64,g_{, M.A. Chelstowska}88_{, C. Chen}63_{, H. Chen}25_{, K. Chen}149_{, L. Chen}33d,h_,

S. Chen33c_{, X. Chen}146c_{, Y. Chen}66_{, Y. Chen}35_{, H.C. Cheng}88_{, Y. Cheng}31_{, A. Cheplakov}64_,

R. Cherkaoui El Moursli136e, V. Chernyatin25,∗, E. Cheu7, L. Chevalier137, V. Chiarella47, G. Chiefari103a,103b,

J.T. Childers6_{, A. Chilingarov}71_{, G. Chiodini}72a_{, A.S. Chisholm}18_{, R.T. Chislett}77_{, A. Chitan}26a_,

M.V. Chizhov64_{, S. Chouridou}9_{, B.K.B. Chow}99_{, D. Chromek-Burckhart}30_{, M.L. Chu}152_{, J. Chudoba}126_,

J.J. Chwastowski39_{, L. Chytka}114_{, G. Ciapetti}133a,133b_{, A.K. Ciftci}4a_{, R. Ciftci}4a_{, D. Cinca}53_{, V. Cindro}74_,

A. Ciocio15_{, P. Cirkovic}13b_{, Z.H. Citron}173_{, M. Citterio}90a_{, M. Ciubancan}26a_{, A. Clark}49_{, P.J. Clark}46_,

R.N. Clarke15_{, W. Cleland}124_{, J.C. Clemens}84_{, C. Clement}147a,147b_{, Y. Coadou}84_{, M. Cobal}165a,165c_,

A. Coccaro139_{, J. Cochran}63_{, L. Coffey}23_{, J.G. Cogan}144_{, J. Coggeshall}166_{, B. Cole}35_{, S. Cole}107_{, A.P. Colijn}106_,

J. Collot55_{, T. Colombo}58c_{, G. Colon}85_{, G. Compostella}100_{, P. Conde Mui˜no}125a,125b_{, E. Coniavitis}48_,

M.C. Conidi12_{, S.H. Connell}146b_{, I.A. Connelly}76_{, S.M. Consonni}90a,90b_{, V. Consorti}48_{, S. Constantinescu}26a_,

C. Conta120a,120b_{, G. Conti}57_{, F. Conventi}103a,i_{, M. Cooke}15_{, B.D. Cooper}77_{, A.M. Cooper-Sarkar}119_,

N.J. Cooper-Smith76_{, K. Copic}15_{, T. Cornelissen}176_{, M. Corradi}20a_{, F. Corriveau}86,j_{, A. Corso-Radu}164_,

A. Cortes-Gonzalez12_{, G. Cortiana}100_{, G. Costa}90a_{, M.J. Costa}168_{, D. Costanzo}140_{, D. Cˆot´e}8_{, G. Cottin}28_,

G. Cowan76_{, B.E. Cox}83_{, K. Cranmer}109_{, G. Cree}29_{, S. Cr´ep´e-Renaudin}55_{, F. Crescioli}79_{, W.A. Cribbs}147a,147b_,

M. Crispin Ortuzar119, M. Cristinziani21, V. Croft105, G. Crosetti37a,37b, C.-M. Cuciuc26a,

T. Cuhadar Donszelmann140_{, J. Cummings}177_{, M. Curatolo}47_{, C. Cuthbert}151_{, H. Czirr}142_{, P. Czodrowski}3_,

Z. Czyczula177_{, S. D’Auria}53_{, M. D’Onofrio}73_{, M.J. Da Cunha Sargedas De Sousa}125a,125b_{, C. Da Via}83_,

W. Dabrowski38a, A. Dafinca119, T. Dai88, O. Dale14, F. Dallaire94, C. Dallapiccola85, M. Dam36,

A.C. Daniells18_{, M. Dano Hoffmann}137_{, V. Dao}48_{, G. Darbo}50a_{, S. Darmora}8_{, J.A. Dassoulas}42_{, A. Dattagupta}60_,

W. Davey21_{, C. David}170_{, T. Davidek}128_{, E. Davies}119,d_{, M. Davies}154_{, O. Davignon}79_{, A.R. Davison}77_,

P. Davison77_{, Y. Davygora}58a_{, E. Dawe}143_{, I. Dawson}140_{, R.K. Daya-Ishmukhametova}85_{, K. De}8_,

R. de Asmundis103a_{, S. De Castro}20a,20b_{, S. De Cecco}79_{, N. De Groot}105_{, P. de Jong}106_{, H. De la Torre}81_,

F. De Lorenzi63_{, L. De Nooij}106_{, D. De Pedis}133a_{, A. De Salvo}133a_{, U. De Sanctis}150_{, A. De Santo}150_,

J.B. De Vivie De Regie116, W.J. Dearnaley71, R. Debbe25, C. Debenedetti138, B. Dechenaux55, D.V. Dedovich64,

I. Deigaard106_{, J. Del Peso}81_{, T. Del Prete}123a,123b_{, F. Deliot}137_{, C.M. Delitzsch}49_{, M. Deliyergiyev}74_,

A. Dell’Acqua30_{, L. Dell’Asta}22_{, M. Dell’Orso}123a,123b_{, M. Della Pietra}103a,i_{, D. della Volpe}49_{, M. Delmastro}5_,

P.A. Delsart55_{, C. Deluca}106_{, S. Demers}177_{, M. Demichev}64_{, A. Demilly}79_{, S.P. Denisov}129_{, D. Derendarz}39_,

J.E. Derkaoui136d_{, F. Derue}79_{, P. Dervan}73_{, K. Desch}21_{, C. Deterre}42_{, P.O. Deviveiros}106_{, A. Dewhurst}130_,

S. Dhaliwal106_{, A. Di Ciaccio}134a,134b_{, L. Di Ciaccio}5_{, A. Di Domenico}133a,133b_{, C. Di Donato}103a,103b_,

A. Di Girolamo30_{, B. Di Girolamo}30_{, A. Di Mattia}153_{, B. Di Micco}135a,135b_{, R. Di Nardo}47_{, A. Di Simone}48_,

R. Di Sipio20a,20b_{, D. Di Valentino}29_{, F.A. Dias}46_{, M.A. Diaz}32a_{, E.B. Diehl}88_{, J. Dietrich}42_{, T.A. Dietzsch}58a_,

S. Diglio84_{, A. Dimitrievska}13a_{, J. Dingfelder}21_{, C. Dionisi}133a,133b_{, P. Dita}26a_{, S. Dita}26a_{, F. Dittus}30_,

F. Djama84_{, T. Djobava}51b_{, M.A.B. do Vale}24c_{, A. Do Valle Wemans}125a,125g_{, D. Dobos}30_{, C. Doglioni}49_,

T. Doherty53_{, T. Dohmae}156_{, J. Dolejsi}128_{, Z. Dolezal}128_{, B.A. Dolgoshein}97,∗_{, M. Donadelli}24d_,

M. Dris10_{, J. Dubbert}88_{, S. Dube}15_{, E. Dubreuil}34_{, E. Duchovni}173_{, G. Duckeck}99_{, O.A. Ducu}26a_{, D. Duda}176_,

A. Dudarev30_{, F. Dudziak}63_{, L. Duflot}116_{, L. Duguid}76_{, M. D¨uhrssen}30_{, M. Dunford}58a_{, H. Duran Yildiz}4a_,

M. D¨uren52_{, A. Durglishvili}51b_{, M. Dwuznik}38a_{, M. Dyndal}38a_{, J. Ebke}99_{, W. Edson}2_{, N.C. Edwards}46_,

W. Ehrenfeld21_{, T. Eifert}144_{, G. Eigen}14_{, K. Einsweiler}15_{, T. Ekelof}167_{, M. El Kacimi}136c_{, M. Ellert}167_{, S. Elles}5_,

F. Ellinghaus82_{, N. Ellis}30_{, J. Elmsheuser}99_{, M. Elsing}30_{, D. Emeliyanov}130_{, Y. Enari}156_{, O.C. Endner}82_,

M. Endo117_{, R. Engelmann}149_{, J. Erdmann}177_{, A. Ereditato}17_{, D. Eriksson}147a_{, G. Ernis}176_{, J. Ernst}2_,

M. Ernst25_{, J. Ernwein}137_{, D. Errede}166_{, S. Errede}166_{, E. Ertel}82_{, M. Escalier}116_{, H. Esch}43_{, C. Escobar}124_,

B. Esposito47_{, A.I. Etienvre}137_{, E. Etzion}154_{, H. Evans}60_{, A. Ezhilov}122_{, L. Fabbri}20a,20b_{, G. Facini}31_,

R.M. Fakhrutdinov129_{, S. Falciano}133a_{, R.J. Falla}77_{, J. Faltova}128_{, Y. Fang}33a_{, M. Fanti}90a,90b_{, A. Farbin}8_,

A. Farilla135a_{, T. Farooque}12_{, S. Farrell}15_{, S.M. Farrington}171_{, P. Farthouat}30_{, F. Fassi}136e_{, P. Fassnacht}30_,

D. Fassouliotis9_{, A. Favareto}50a,50b_{, L. Fayard}116_{, P. Federic}145a_{, O.L. Fedin}122,k_{, W. Fedorko}169_,

M. Fehling-Kaschek48_{, S. Feigl}30_{, L. Feligioni}84_{, C. Feng}33d_{, E.J. Feng}6_{, H. Feng}88_{, A.B. Fenyuk}129_,

S. Fernandez Perez30_{, S. Ferrag}53_{, J. Ferrando}53_{, A. Ferrari}167_{, P. Ferrari}106_{, R. Ferrari}120a_,

D.E. Ferreira de Lima53_{, A. Ferrer}168_{, D. Ferrere}49_{, C. Ferretti}88_{, A. Ferretto Parodi}50a,50b_{, M. Fiascaris}31_,

F. Fiedler82_{, A. Filipˇciˇc}74_{, M. Filipuzzi}42_{, F. Filthaut}105_{, M. Fincke-Keeler}170_{, K.D. Finelli}151_,

M.C.N. Fiolhais125a,125c_{, L. Fiorini}168_{, A. Firan}40_{, A. Fischer}2_{, J. Fischer}176_{, W.C. Fisher}89_{, E.A. Fitzgerald}23_,

M. Flechl48_{, I. Fleck}142_{, P. Fleischmann}88_{, S. Fleischmann}176_{, G.T. Fletcher}140_{, G. Fletcher}75_{, T. Flick}176_,

A. Floderus80_{, L.R. Flores Castillo}174,l_{, A.C. Florez Bustos}160b_{, M.J. Flowerdew}100_{, A. Formica}137_{, A. Forti}83_,

D. Fortin160a_{, D. Fournier}116_{, H. Fox}71_{, S. Fracchia}12_{, P. Francavilla}79_{, M. Franchini}20a,20b_{, S. Franchino}30_,

D. Francis30, L. Franconi118, M. Franklin57, S. Franz61, M. Fraternali120a,120b, S.T. French28, C. Friedrich42,

F. Friedrich44_{, D. Froidevaux}30_{, J.A. Frost}28_{, C. Fukunaga}157_{, E. Fullana Torregrosa}82_{, B.G. Fulsom}144_,

J. Fuster168_{, C. Gabaldon}55_{, O. Gabizon}176_{, A. Gabrielli}20a,20b_{, A. Gabrielli}133a,133b_{, S. Gadatsch}106_,

S. Gadomski49_{, G. Gagliardi}50a,50b_{, P. Gagnon}60_{, C. Galea}105_{, B. Galhardo}125a,125c_{, E.J. Gallas}119_{, V. Gallo}17_,

B.J. Gallop130_{, P. Gallus}127_{, G. Galster}36_{, K.K. Gan}110_{, J. Gao}33b,h_{, Y.S. Gao}144,f_{, F.M. Garay Walls}46_,

F. Garberson177_{, C. Garc´ıa}168_{, J.E. Garc´ıa Navarro}168_{, M. Garcia-Sciveres}15_{, R.W. Gardner}31_{, N. Garelli}144_,

V. Garonne30_{, C. Gatti}47_{, G. Gaudio}120a_{, B. Gaur}142_{, L. Gauthier}94_{, P. Gauzzi}133a,133b_{, I.L. Gavrilenko}95_,

C. Gay169_{, G. Gaycken}21_{, E.N. Gazis}10_{, P. Ge}33d_{, Z. Gecse}169_{, C.N.P. Gee}130_{, D.A.A. Geerts}106_,

Ch. Geich-Gimbel21_{, K. Gellerstedt}147a,147b_{, C. Gemme}50a_{, A. Gemmell}53_{, M.H. Genest}55_{, S. Gentile}133a,133b_,

M. George54_{, S. George}76_{, D. Gerbaudo}164_{, A. Gershon}154_{, H. Ghazlane}136b_{, N. Ghodbane}34_{, B. Giacobbe}20a_,

S. Giagu133a,133b_{, V. Giangiobbe}12_{, P. Giannetti}123a,123b_{, F. Gianotti}30_{, B. Gibbard}25_{, S.M. Gibson}76_,

M. Gilchriese15_{, T.P.S. Gillam}28_{, D. Gillberg}30_{, G. Gilles}34_{, D.M. Gingrich}3,e_{, N. Giokaris}9_,

M.P. Giordani165a,165c_{, R. Giordano}103a,103b_{, F.M. Giorgi}20a_{, F.M. Giorgi}16_{, P.F. Giraud}137_{, D. Giugni}90a_,

C. Giuliani48, M. Giulini58b, B.K. Gjelsten118, S. Gkaitatzis155, I. Gkialas155,m, L.K. Gladilin98, C. Glasman81,

J. Glatzer30_{, P.C.F. Glaysher}46_{, A. Glazov}42_{, G.L. Glonti}64_{, M. Goblirsch-Kolb}100_{, J.R. Goddard}75_,

J. Godlewski30_{, C. Goeringer}82_{, S. Goldfarb}88_{, T. Golling}177_{, D. Golubkov}129_{, A. Gomes}125a,125b,125d_,

L.S. Gomez Fajardo42, R. Gon¸calo125a, J. Goncalves Pinto Firmino Da Costa137, L. Gonella21,

S. Gonz´alez de la Hoz168_{, G. Gonzalez Parra}12_{, S. Gonzalez-Sevilla}49_{, L. Goossens}30_{, P.A. Gorbounov}96_,

H.A. Gordon25_{, I. Gorelov}104_{, B. Gorini}30_{, E. Gorini}72a,72b_{, A. Goriˇsek}74_{, E. Gornicki}39_{, A.T. Goshaw}6_,

C. G¨ossling43_{, M.I. Gostkin}64_{, M. Gouighri}136a_{, D. Goujdami}136c_{, M.P. Goulette}49_{, A.G. Goussiou}139_{, C. Goy}5_,

S. Gozpinar23_{, H.M.X. Grabas}137_{, L. Graber}54_{, I. Grabowska-Bold}38a_{, P. Grafstr¨om}20a,20b_{, K-J. Grahn}42_,

J. Gramling49_{, E. Gramstad}118_{, S. Grancagnolo}16_{, V. Grassi}149_{, V. Gratchev}122_{, H.M. Gray}30_{, E. Graziani}135a_,

O.G. Grebenyuk122, Z.D. Greenwood78,n, K. Gregersen77, I.M. Gregor42, P. Grenier144, J. Griffiths8,

A.A. Grillo138_{, K. Grimm}71_{, S. Grinstein}12,o_{, Ph. Gris}34_{, Y.V. Grishkevich}98_{, J.-F. Grivaz}116_{, J.P. Grohs}44_,

A. Grohsjean42_{, E. Gross}173_{, J. Grosse-Knetter}54_{, G.C. Grossi}134a,134b_{, J. Groth-Jensen}173_{, Z.J. Grout}150_,

L. Guan33b_{, J. Guenther}127_{, F. Guescini}49_{, D. Guest}177_{, O. Gueta}154_{, C. Guicheney}34_{, E. Guido}50a,50b_,

T. Guillemin116_{, S. Guindon}2_{, U. Gul}53_{, C. Gumpert}44_{, J. Guo}35_{, S. Gupta}119_{, P. Gutierrez}112_,

N.G. Gutierrez Ortiz53_{, C. Gutschow}77_{, N. Guttman}154_{, C. Guyot}137_{, C. Gwenlan}119_{, C.B. Gwilliam}73_,

A. Haas109_{, C. Haber}15_{, H.K. Hadavand}8_{, N. Haddad}136e_{, P. Haefner}21_{, S. Hageb¨ock}21_{, Z. Hajduk}39_,

H. Hakobyan178_{, M. Haleem}42_{, D. Hall}119_{, G. Halladjian}89_{, K. Hamacher}176_{, P. Hamal}114_{, K. Hamano}170_,

M. Hamer54_{, A. Hamilton}146a_{, S. Hamilton}162_{, G.N. Hamity}146c_{, P.G. Hamnett}42_{, L. Han}33b_{, K. Hanagaki}117_,

K. Hanawa156_{, M. Hance}15_{, P. Hanke}58a_{, R. Hanna}137_{, J.B. Hansen}36_{, J.D. Hansen}36_{, P.H. Hansen}36_,

K. Hara161_{, A.S. Hard}174_{, T. Harenberg}176_{, F. Hariri}116_{, S. Harkusha}91_{, D. Harper}88_{, R.D. Harrington}46_,

S. Hassani137_{, S. Haug}17_{, M. Hauschild}30_{, R. Hauser}89_{, M. Havranek}126_{, C.M. Hawkes}18_{, R.J. Hawkings}30_,

A.D. Hawkins80_{, T. Hayashi}161_{, D. Hayden}89_{, C.P. Hays}119_{, H.S. Hayward}73_{, S.J. Haywood}130_{, S.J. Head}18_,

T. Heck82_{, V. Hedberg}80_{, L. Heelan}8_{, S. Heim}121_{, T. Heim}176_{, B. Heinemann}15_{, L. Heinrich}109_{, J. Hejbal}126_,

L. Helary22_{, C. Heller}99_{, M. Heller}30_{, S. Hellman}147a,147b_{, D. Hellmich}21_{, C. Helsens}30_{, J. Henderson}119_,

R.C.W. Henderson71_{, Y. Heng}174_{, C. Hengler}42_{, A. Henrichs}177_{, A.M. Henriques Correia}30_{, S. Henrot-Versille}116_,

C. Hensel54_{, G.H. Herbert}16_{, Y. Hern´andez Jim´enez}168_{, R. Herrberg-Schubert}16_{, G. Herten}48_{, R. Hertenberger}99_,

L. Hervas30_{, G.G. Hesketh}77_{, N.P. Hessey}106_{, R. Hickling}75_{, E. Hig´on-Rodriguez}168_{, E. Hill}170_{, J.C. Hill}28_,

K.H. Hiller42_{, S. Hillert}21_{, S.J. Hillier}18_{, I. Hinchliffe}15_{, E. Hines}121_{, M. Hirose}158_{, D. Hirschbuehl}176_,

J. Hobbs149_{, N. Hod}106_{, M.C. Hodgkinson}140_{, P. Hodgson}140_{, A. Hoecker}30_{, M.R. Hoeferkamp}104_{, F. Hoenig}99_,

J. Hoffman40_{, D. Hoffmann}84_{, J.I. Hofmann}58a_{, M. Hohlfeld}82_{, T.R. Holmes}15_{, T.M. Hong}121_,

L. Hooft van Huysduynen109_{, W.H. Hopkins}115_{, Y. Horii}102_{, J-Y. Hostachy}55_{, S. Hou}152_{, A. Hoummada}136a_,

J. Howard119_{, J. Howarth}42_{, M. Hrabovsky}114_{, I. Hristova}16_{, J. Hrivnac}116_{, T. Hryn’ova}5_{, C. Hsu}146c_{, P.J. Hsu}82_,

S.-C. Hsu139_{, D. Hu}35_{, X. Hu}88_{, Y. Huang}42_{, Z. Hubacek}30_{, F. Hubaut}84_{, F. Huegging}21_{, T.B. Huffman}119_,

E.W. Hughes35_{, G. Hughes}71_{, M. Huhtinen}30_{, T.A. H¨ulsing}82_{, M. Hurwitz}15_{, N. Huseynov}64,b_{, J. Huston}89_,

J. Huth57_{, G. Iacobucci}49_{, G. Iakovidis}10_{, I. Ibragimov}142_{, L. Iconomidou-Fayard}116_{, E. Ideal}177_{, P. Iengo}103a_,

O. Igonkina106_{, T. Iizawa}172_{, Y. Ikegami}65_{, K. Ikematsu}142_{, M. Ikeno}65_{, Y. Ilchenko}31,p_{, D. Iliadis}155_{, N. Ilic}159_,

Y. Inamaru66_{, T. Ince}100_{, P. Ioannou}9_{, M. Iodice}135a_{, K. Iordanidou}9_{, V. Ippolito}57_{, A. Irles Quiles}168_,

C. Isaksson167_{, M. Ishino}67_{, M. Ishitsuka}158_{, R. Ishmukhametov}110_{, C. Issever}119_{, S. Istin}19a_,

J.M. Iturbe Ponce83_{, R. Iuppa}134a,134b_{, J. Ivarsson}80_{, W. Iwanski}39_{, H. Iwasaki}65_{, J.M. Izen}41_{, V. Izzo}103a_,

B. Jackson121, M. Jackson73, P. Jackson1, M.R. Jaekel30, V. Jain2, K. Jakobs48, S. Jakobsen30, T. Jakoubek126,

J. Jakubek127_{, D.O. Jamin}152_{, D.K. Jana}78_{, E. Jansen}77_{, H. Jansen}30_{, J. Janssen}21_{, M. Janus}171_{, G. Jarlskog}80_,

N. Javadov64,b_{, T. Jav˚urek}48_{, L. Jeanty}15_{, J. Jejelava}51a,q_{, G.-Y. Jeng}151_{, D. Jennens}87_{, P. Jenni}48,r_,

J. Jentzsch43_{, C. Jeske}171_{, S. J´ez´equel}5_{, H. Ji}174_{, J. Jia}149_{, Y. Jiang}33b_{, M. Jimenez Belenguer}42_{, S. Jin}33a_,

A. Jinaru26a_{, O. Jinnouchi}158_{, M.D. Joergensen}36_{, K.E. Johansson}147a,147b_{, P. Johansson}140_{, K.A. Johns}7_,

K. Jon-And147a,147b_{, G. Jones}171_{, R.W.L. Jones}71_{, T.J. Jones}73_{, J. Jongmanns}58a_{, P.M. Jorge}125a,125b_,

K.D. Joshi83_{, J. Jovicevic}148_{, X. Ju}174_{, C.A. Jung}43_{, R.M. Jungst}30_{, P. Jussel}61_{, A. Juste Rozas}12,o_{, M. Kaci}168_,

A. Kaczmarska39_{, M. Kado}116_{, H. Kagan}110_{, M. Kagan}144_{, E. Kajomovitz}45_{, C.W. Kalderon}119_{, S. Kama}40_,

A. Kamenshchikov129_{, N. Kanaya}156_{, M. Kaneda}30_{, S. Kaneti}28_{, V.A. Kantserov}97_{, J. Kanzaki}65_{, B. Kaplan}109_,

A. Kapliy31_{, D. Kar}53_{, K. Karakostas}10_{, N. Karastathis}10_{, M.J. Kareem}54_{, M. Karnevskiy}82_{, S.N. Karpov}64_,

Z.M. Karpova64_{, K. Karthik}109_{, V. Kartvelishvili}71_{, A.N. Karyukhin}129_{, L. Kashif}174_{, G. Kasieczka}58b_,

R.D. Kass110_{, A. Kastanas}14_{, Y. Kataoka}156_{, A. Katre}49_{, J. Katzy}42_{, V. Kaushik}7_{, K. Kawagoe}69_,

T. Kawamoto156_{, G. Kawamura}54_{, S. Kazama}156_{, V.F. Kazanin}108_{, M.Y. Kazarinov}64_{, R. Keeler}170_{, R. Kehoe}40_,

M. Keil54, J.S. Keller42, J.J. Kempster76, H. Keoshkerian5, O. Kepka126, B.P. Kerˇsevan74, S. Kersten176,

K. Kessoku156_{, J. Keung}159_{, F. Khalil-zada}11_{, H. Khandanyan}147a,147b_{, A. Khanov}113_{, A. Khodinov}97_,

A. Khomich58a_{, T.J. Khoo}28_{, G. Khoriauli}21_{, A. Khoroshilov}176_{, V. Khovanskiy}96_{, E. Khramov}64_{, J. Khubua}51b_,

H.Y. Kim8, H. Kim147a,147b, S.H. Kim161, N. Kimura172, O. Kind16, B.T. King73, M. King168, R.S.B. King119,

S.B. King169_{, J. Kirk}130_{, A.E. Kiryunin}100_{, T. Kishimoto}66_{, D. Kisielewska}38a_{, F. Kiss}48_{, T. Kittelmann}124_,

K. Kiuchi161_{, E. Kladiva}145b_{, M. Klein}73_{, U. Klein}73_{, K. Kleinknecht}82_{, P. Klimek}147a,147b_{, A. Klimentov}25_,

R. Klingenberg43_{, J.A. Klinger}83_{, T. Klioutchnikova}30_{, P.F. Klok}105_{, E.-E. Kluge}58a_{, P. Kluit}106_{, S. Kluth}100_,

E. Kneringer61_{, E.B.F.G. Knoops}84_{, A. Knue}53_{, D. Kobayashi}158_{, T. Kobayashi}156_{, M. Kobel}44_{, M. Kocian}144_,

P. Kodys128_{, P. Koevesarki}21_{, T. Koffas}29_{, E. Koffeman}106_{, L.A. Kogan}119_{, S. Kohlmann}176_{, Z. Kohout}127_,

T. Kohriki65, T. Koi144, H. Kolanoski16, I. Koletsou5, J. Koll89, A.A. Komar95,∗, Y. Komori156, T. Kondo65,

N. Kondrashova42_{, K. K¨oneke}48_{, A.C. K¨onig}105_{, S. K¨onig}82_{, T. Kono}65,s_{, R. Konoplich}109,t_{, N. Konstantinidis}77_,

R. Kopeliansky153_{, S. Koperny}38a_{, L. K¨opke}82_{, A.K. Kopp}48_{, K. Korcyl}39_{, K. Kordas}155_{, A. Korn}77_,

A.A. Korol108,c_{, I. Korolkov}12_{, E.V. Korolkova}140_{, V.A. Korotkov}129_{, O. Kortner}100_{, S. Kortner}100_,

V.V. Kostyukhin21_{, V.M. Kotov}64_{, A. Kotwal}45_{, C. Kourkoumelis}9_{, V. Kouskoura}155_{, A. Koutsman}160a_,

R. Kowalewski170_{, T.Z. Kowalski}38a_{, W. Kozanecki}137_{, A.S. Kozhin}129_{, V. Kral}127_{, V.A. Kramarenko}98_,

G. Kramberger74_{, D. Krasnopevtsev}97_{, M.W. Krasny}79_{, A. Krasznahorkay}30_{, J.K. Kraus}21_{, A. Kravchenko}25_,

S. Kreiss109_{, M. Kretz}58c_{, J. Kretzschmar}73_{, K. Kreutzfeldt}52_{, P. Krieger}159_{, K. Kroeninger}54_{, H. Kroha}100_,

J. Kroll121_{, J. Kroseberg}21_{, J. Krstic}13a_{, U. Kruchonak}64_{, H. Kr¨uger}21_{, T. Kruker}17_{, N. Krumnack}63_,

Z.V. Krumshteyn64_{, A. Kruse}174_{, M.C. Kruse}45_{, M. Kruskal}22_{, T. Kubota}87_{, S. Kuday}4a_{, S. Kuehn}48_,

A. Kugel58c_{, A. Kuhl}138_{, T. Kuhl}42_{, V. Kukhtin}64_{, Y. Kulchitsky}91_{, S. Kuleshov}32b_{, M. Kuna}133a,133b_,