Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in sqrt(s) = 7 TeV pp collisions using 4.7 fb-1 of ATLAS data

arXiv:1208.2590v2 [hep-ex] 17 Dec 2012

EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)

CERN-PH-EP-2012-200

Submitted to: Physical Review Letters

Search for Direct Top Squark Pair Production in Final States with

One Isolated Lepton, Jets, and Missing Transverse Momentum

in

√

s

= 7 TeV pp

Collisions using

4.7

fb

−1

of ATLAS Data

The ATLAS Collaboration

Abstract

A search is presented for direct top squark pair production in final states with one isolated electron

or muon, jets, and missing transverse momentum in proton-proton collisions at

√

s = 7 TeV

. The

measurement is based on 4.7 fb

−₁

of data collected with the ATLAS detector at the LHC. Each top

squark is assumed to decay to a top quark and the lightest supersymmetric particle (LSP). The data

are found to be consistent with standard model expectations. Top squark masses between

230 GeV

and

440 GeV

are excluded with 95% confidence for massless LSPs, and top squark masses around

Search for Direct Top Squark Pair Production in Final States with One Isolated

Lepton, Jets, and Missing Transverse Momentum in

√

s

= 7 TeV pp Collisions using

4.7 fb

−1

of ATLAS Data

The ATLAS Collaboration

A search is presented for direct top squark pair production in final states with one isolated electron

or muon, jets, and missing transverse momentum in proton-proton collisions at √s = 7 TeV. The

measurement is based on 4.7 fb−1_{of data collected with the ATLAS detector at the LHC. Each top}

squark is assumed to decay to a top quark and the lightest supersymmetric particle (LSP). The data are found to be consistent with standard model expectations. Top squark masses between 230 GeV and 440 GeV are excluded with 95% confidence for massless LSPs, and top squark masses around 400 GeV are excluded for LSP masses up to 125 GeV.

PACS numbers: 14.80.Ly

Weak scale supersymmetry (SUSY) [1–9] is an exten-sion to the standard model (SM) that provides a solution to the hierarchy problem by introducing supersymmet-ric partners of all SM particles. In the framework of a generic R-parity conserving minimal supersymmetric ex-tension of the SM (MSSM) [10–14], SUSY particles are produced in pairs, and the lightest supersymmetric par-ticle (LSP) is stable and can be a dark matter candidate. In a large variety of models, the LSP is the lightest neu-tralino, ˜χ0

1, which only interacts weakly and thus escapes

detection.

Light top squarks (stop) are suggested by naturalness arguments [15, 16]. Searches for direct stop pair pro-duction have been previously reported by the CDF and D0 experiments [17, 18]. Searches for stops via ˜g˜g pro-duction have been reported by the ATLAS [19–21] and CMS [22, 23] collaborations. In this Letter, one stop mass eigenstate (˜t1) is assumed to be significantly lighter

than the other squarks. A search is presented for directly pair-produced stops, which are each assumed to decay to a top quark and the LSP. The signature for such a sig-nal is characterized by a top quark pair (tt) produced in association with possibly large missing transverse

mo-mentum, the magnitude of which is referred to as Emiss

T ,

from the undetected LSPs. The analysis targets final states where one top quark decays hadronically and the other semileptonically.

The ATLAS detector [24] has a solenoid, surrounding the inner tracking detector (ID), a calorimeter, as well as a barrel and two endcap toroidal magnets support-ing the muon spectrometer. The ID consists of silicon pixel, silicon microstrip, and transition radiation detec-tors and provides precision tracking of charged particles for pseudorapidity |η| < 2.5 [25]. The calorimeter, placed outside the solenoid, covers |η| < 4.9 and is composed of sampling electromagnetic and hadronic calorimeters with either liquid argon or scintillating tiles as the active me-dia. The muon spectrometer surrounds the calorimeters and consists of a system of precision tracking chambers in |η| < 2.7, and detectors for triggering in |η| < 2.4.

The analysis is based on data recorded by the ATLAS

detector in 2011 corresponding to 4.7 fb−1 _{of integrated}

luminosity with the LHC operating at a pp center-of-mass energy of 7 TeV. The data were collected requiring either

a single-lepton (electron or muon) or an Emiss

T trigger.

The combined trigger efficiency is > 98% for the chosen

selection criteria on leptons and Emiss

T . Requirements

that ensure the quality of beam conditions, detector per-formance and data are imposed.

Monte Carlo (MC) event samples using the full AT-LAS detector simulation [26] based on the Geant4 pro-gram [27] are used to aid in the description of the

background and to model the SUSY signal. The

ef-fect of multiple pp interactions per bunch crossing is also simulated [28]. Production of top quark pairs is simulated with MC@NLO 4.01 [29, 30], alternatively us-ing ALPGEN 2.14 [31] and PowHeg HVQ patch 4 [32– 34]. The data modeling is improved for high jet mul-tiplicities by reweighting the MC@NLO sample to match the jet multiplicity distribution in ALPGEN. Uncertain-ties associated with initial- and final-state radiation (ISR/FSR) [35] are assessed using AcerMC 3.7 [36] sam-ples. A top quark mass of 172.5 GeV is used

consis-tently. W and Z/γ∗ _{production in association with}

jets are each modeled with ALPGEN. Diboson V V (W W , W Z and ZZ) production is simulated with ALPGEN and cross-checked with HERWIG 6.520 [37]. Single top

pro-duction is modeled with MC@NLO, and t¯t events

pro-duced in association with Z, W or W W (t¯t + V )

are generated with MADGRAPH 5 [38]. Next-to-leading-order (NLO) PDFs CT10 [39] are used with all NLO

MC samples. For all other samples, LO PDFs are

used: MRSTmcal [40] with HERWIG, and CTEQ6L1 [41] with

ALPGENand MADGRAPH. Fragmentation and hadronization

for the ALPGEN and MC@NLO samples are performed with HERWIG, using JIMMY 4.31 [42] for the underlying event, and for the MADGRAPH samples PYTHIA 6.425 [43] is used. The t¯t, single top and t¯t + V production cross sections are normalized to approximate next-to-next-to-leading order (NNLO) [44], next-to-next-to-leading-logarithmic

accuracy (NLO+NNLL) [45–47] and NLO [48] calcula-tions, respectively. QCD NNLO FEWZ [49] inclusive W and Z cross sections are used for the normalization of the W +jets and Z+jets processes. Expected diboson yields are normalized using NLO QCD predictions ob-tained with MCFM [50, 51].

Stop pair production is modeled using

Herwig++ 2.5.2[52]. The ˜t1 is chosen to be mostly the

partner of the right-handed top quark, and the ˜χ01 to

be almost a pure bino. A signal grid is generated with a step size of 50 GeV both for the stop and LSP mass values. Signal cross sections are calculated to NLO in the strong coupling constant, including the resummation of soft gluon emission at next-to-leading-logarithmic

accuracy (NLO+NLL) [53–55]. The nominal cross

section and the uncertainty are taken from an envelope of cross section predictions using different PDF sets and factorization and renormalization scales [56]. The ˜t1˜t1

cross section for m˜t1 = 400 GeV is (0.21 ± 0.03) pb. Events must pass basic quality criteria to reject detec-tor noise and non-collision backgrounds [57, 58] and are required to have ≥ 1 reconstructed primary vertex asso-ciated with five or more tracks with transverse

momen-tum pT > 0.4 GeV. Events are retained if they contain

exactly one muon [59] with |η| < 2.4 and pT > 20 GeV

or one electron passing ‘tight’ [60] selection criteria with

|η| < 2.47 and pT > 25 GeV. Leptons are required to

be isolated from other particles. The scalar sum of the transverse momenta of tracks above 1 GeV within a cone of size ∆R = 0.2 around the lepton candidate is required to be < 10% of the electron pT, and < 1.8 GeV for the

muon. Events are rejected if they contain additional lep-tons passing looser selection criteria [61]. Jets are recon-structed from three-dimensional calorimeter energy clus-ters using the anti-ktjet clustering algorithm [62] with a

radius parameter of 0.4. The jet energy is corrected for the effects of calorimeter non-compensation and

inhomo-geneities using pT- and η-dependent calibration factors

based on MC simulations and validated with extensive test-beam and collision-data studies [63]. To suppress jet background originating from uncorrelated soft collisions,

≥ 75% of the summed pT of all tracks associated to a

jet must come from tracks associated to the selected pri-mary vertex. Events with four or more jets with |η| < 2.5

and pT > 80, 60, 40, and 25 GeV are selected. At least

one jet needs to be identified as a b-jet, which is a jet containing a b-hadron decay. These are identified using the ‘MV1’ b-tagging algorithm [64] which exploits both impact parameter and secondary vertex information. An operating point is employed corresponding to an average 75% b-tagging efficiency and to a < 2% misidentification rate for light-quark/gluon jets for jets with pT> 20 GeV

and |η| < 2.5 in t¯t MC events.

Ambiguities between overlapping leptons and jets are resolved by discarding either the jet or lepton candi-dates [61] based on their separation ∆R. The

measure-ment of Emiss

T is based on the transverse momenta of all

electron and muon candidates, all jets after overlap re-moval, and all calorimeter energy clusters not associated to such objects. The background is reduced by requiring

∆φmin > 0.8, where ∆φmin is the minimum azimuthal

separation between the two highest pTjets and the

miss-ing transverse momentum direction. A requirement on

the three-jet mass mjjj of the hadronically decaying top

quark specifically rejects the dileptonic t¯t background,

where both W bosons from the top quarks decay lepton-ically. The jet-jet pair having invariant mass > 60 GeV and the smallest ∆R is selected to form the hadronically

decaying W boson. The mass mjjj is reconstructed

in-cluding a third jet closest in ∆R to the hadronic W boson

momentum vector and 130 GeV < mjjj < 205 GeV is

re-quired.

Five signal regions (SR A–E) are defined in order to op-timize the sensitivity for different stop and LSP masses. For increasing stop mass and increasing mass difference between stop and LSP the requirements are tightened on Emiss

T , on the ratio ETmiss/

√

HT, where HT is the scalar

sum of the momenta of the four selected jets with

high-est pT, and on the transverse mass mT[65], as shown in

Table I. The number of observed events in each SR after applying all selection criteria are given in Table II.

TABLE I. Selection requirements defining the SR A–E.

Requirement SR A SR B SR C SR D SR E Emiss T [GeV] > 150 150 150 225 275 Emiss T / √ HT[GeV1/2] > 7 9 11 11 11 mT[GeV] > 120 120 120 130 140

The product of the kinematic acceptance, detector and reconstruction efficiency (A · ǫ) varies between 4% and 0.3% for SR A and between 3% and 0.01% for SR E as the stop-LSP mass difference varies between 550 GeV and 250 GeV.

The dominant background arises from dileptonic t¯t

events in which one of the leptons is either not identi-fied, is outside the detector acceptance, or is a

hadron-ically decaying τ lepton. In all these cases, the t¯t

de-cay products include two or more high-pT neutrinos,

re-sulting in large Emiss

T and mT. Three control regions

(CRs) enriched in dileptonic t¯t events (2-lep TR),

single-leptonic t¯t events (1-lep TR), and W +jets events (1-lep

WR) are designed to normalize the corresponding back-grounds using data. The 2-lep TR differs from the SRs by selecting events with exactly two leptons, applying no requirements on mT, ETmiss/

√

HT and mjjj, and by

re-quiring Emiss

T > 125 GeV. The 1-lep TR and 1-lep WR

have selection criteria identical to SR A, except the mT

requirement is changed to 60 < mT< 90 GeV and the

1-lep WRhas a b-jet veto instead of a b-jet requirement. t¯t production accounts for > 90% of events in the top CRs and W +jets production for > 60% in the W CR. The

signal contamination reaches a maximum of 8% in the

2-lep TR for m˜t1 = 200 GeV. The multijet background,

which mainly originates from jets misidentified as lep-tons, is estimated using the matrix method [61]. Other

background contributions (V V , t¯t+V and single top) are

estimated using MC simulation normalized to the theo-retical cross sections. The Z+jets background is found to be negligible.

Good agreement is observed between data and the SM

prediction before using the CRs to normalize the t¯t and

W +jets backgrounds. As an example, Fig. 1 shows the

agreement of the ETmiss distributions in the 2-lep TR,

and the EmissT distribution in SR A. In addition, the mT

distribution for a looser requirements region — ETmiss>

40 GeV and no requirements on Emiss

T /

√

HT and mjjj

(pre-selection) — is shown.

Simultaneous fits to the numbers of observed events in the three CRs and one SR at a time are performed to

nor-malize the t¯t and W +jets background estimates as well

as to search for an excess from a potential signal

contri-bution. The 1-lep and 2-lep TRs have t¯t normalizations

that float independently and that are found to be in good

agreement with each other. The t¯t estimates in the SRs

are based on the 2-lep TR, as this minimizes the extrap-olation uncertainties in the fit. Systematic uncertainties are treated as nuisance parameters with Gaussian prob-ability density functions.

The dominant systematic uncertainties in the fitted t¯t

background estimate are theoretical and modeling uncer-tainties, which affect the event kinematics and thus the extrapolation from the CR to the various SRs. They are determined by using different generators (MC@NLO,

PowHegand ALPGEN), different showering models (HERWIG

and PYTHIA) and by varying ISR/FSR parameters, and amount to 10–30%. Electroweak single top production is associated with an 8% theoretical uncertainty [45–47]

and the t¯t + V background has a 30% uncertainty [48].

The difference between ALPGEN and HERWIG predictions is used to assess the uncertainty on the diboson back-ground, and the uncertainty on the multijet background is based on the matrix method. Both of these uncertain-ties are estimated as 100%.

Experimental uncertainties affect the signal and back-ground yields, including those normalized in CRs. They are estimated by aid of MC events and are dominated by uncertainties in the jet energy scale, jet energy resolution and b-tagging. Uncertainties related to the trigger and lepton reconstruction and identification (momentum and energy scales, resolutions and efficiencies) give smaller contributions. Other small uncertainties are due to mod-eling of multiple pp interactions, the integrated luminos-ity, and the limited numbers of MC and data events. The uncertainty on A · ǫ varies between 9% and 16% as the simulated stop-LSP mass difference varies between 550 GeV (SR E) and 250 GeV (SR A and B).

Table II shows the results of the background fit to the

[GeV] miss T E 150 200 250 300 350 400 450 500 Entries / 25 GeV -1 10 1 10 2 10 3 10 = 7 TeV) s Data 2011 ( Standard model Multijets (data estimate)

t t V+jets, VV +V, single top t t =1 GeV 0 1 χ∼ =400 GeV, m 1 t ~ m =1 GeV 0 1 χ∼ =500 GeV, m 1 t ~ m channels µ e+ -1 L dt = 4.7 fb

∫

2-lep TR ATLAS [GeV] miss T E 150 200 250 300 350 400 450 500 550 Entries / 25 GeV -1 10 1 10 2 10 3 10 = 7 TeV) s Data 2011 ( Standard model Multijets (data estimate)

t t V+jets, VV +V, single top t t =1 GeV 0 1 χ∼ =400 GeV, m 1 t ~ m =1 GeV 0 1 χ∼ =500 GeV, m 1 t ~ m channels µ e+ -1 L dt = 4.7 fb

∫

SRA ATLAS [GeV] T m 0 100 200 300 400 500 Entries / 10 GeV -1 10 1 10 2 10 3 10 4 10 5 10 6

10 Data 2011 (_{Standard model}s = 7 TeV)

Multijets (data estimate) t t V+jets, VV +V, single top t t =1 GeV 0 1 χ∼ =400 GeV, m 1 t ~ m =1 GeV 0 1 χ∼ =500 GeV, m 1 t ~ m channels µ e+ -1 L dt = 4.7 fb

∫

preselection ATLAS

FIG. 1. Top: Emiss

T distributions for the 2-lep TR. Center:

Emiss

T distributions for SR A. Bottom: mT distribution for

the pre-selection requirements (see text). All plots show the electron and muon combined channel, before normalization fits. Hatched areas indicate the combined uncertainty due to MC sample size and the jet energy scale.

CRs, extrapolated to the SRs. The fitted numbers of t¯t

and W +jets events are compatible with the MC predic-tions, with factors of 1.01 and 0.90 applied, respectively. To assess the agreement between the SM expectation and the observation in the SRs, a second set of simultaneous fits including one SR at a time and all CRs is performed.

The p0-values (probing the background-only hypothesis)

TABLE II. Numbers of observed events in the five signal regions and three background control regions, as well as their estimated values and all (statistical and systematic) uncertainties from a fit to the control regions only, for the electron and muon combined

channel. The expected numbers of signal events for mt˜1= 400 GeV (500 GeV) and mχ˜

0

1= 1 GeV for benchmark points 1 (2)

are listed for comparison. The central values of the fitted sum of backgrounds in the control regions agree with the observations

by construction. Furthermore, p0-values and 95% CLs observed (expected) upper limits on beyond-SM events are given, using

simultaneous fits including one SR at a time and all CRs.

Regions SR A SR B SR C SR D SR E 2-lep TR 1-lep TR 1-lep WR

t¯t 36 ± 5 27 ± 4 11 ± 2 4.9 ± 1.3 1.3 ± 0.6 109 ± 10 364 ± 23 59 ± 19 t¯t+ V , single top 2.9 ± 0.7 2.5 ± 0.6 1.6 ± 0.3 0.9 ± 0.3 0.4 ± 0.1 7.2 ± 1.3 18 ± 3 6.1 ± 1.6 V+jets, V V 2.5 ± 1.3 1.7 ± 0.8 0.4 ± 0.1 0.3 ± 0.1 0.1 ± 0.1 1.6 ± 0.8 38 ± 11 162 ± 23 Multijet 0.4 ± 0.4 0.3 ± 0.3 0.3 ± 0.3 0.3 ± 0.3 0.0+0.3 −0.0 0.0 +0.6 −0.0 1.7 ± 1.7 0.8 ± 0.8 Total background 42 ± 6 31 ± 4 13 ± 2 6.4 ± 1.4 1.8 ± 0.7 118 ± 10 421 ± 20 228 ± 15 Signal benchmark 1 (2) 25.6 (8.8) 23.0 (8.1) 17.5 (6.9) 13.5 (6.2) 7.1 (4.5) 1.7 (0.6) 2.3 (0.6) 0.4 (0.1) Observed events 38 25 15 8 5 118 421 228 p0-values 0.50 0.50 0.32 0.24 0.015 - - -Obs. (exp.) NBSM< 15.1 (17.2) 10.1 (13.8) 10.8 (9.2) 8.4 (7.0) 8.2 (4.6) - - -events is found.

One-sided exclusion limits are derived using the CLs

method [66], based on the same simultaneous fit method but taking the predicted signal contamination in the CRs into account. To obtain the best expected combined ex-clusion limit, a mapping in the stop-LSP mass plane is constructed by selecting the SR with the lowest expected

CLs value for each grid point. The expected and

ob-served 95% CLsexclusion limits are displayed in Fig. 2.

Stop masses are excluded between 230 GeV and 440 GeV for massless LSPs, and stop masses around 400 GeV are excluded for LSP masses up to 125 GeV. These values

are derived from the −1 σSUSY

theory observed limit contour.

These stop mass limits significantly extend previous re-sults [17, 18]. Limits on beyond-SM contributions are derived from the same simultaneous fit but without sig-nal model-dependent inputs (i.e. without sigsig-nal contam-ination in the CRs, and without signal systematic uncer-tainties). The resulting limits are shown at the bottom of Table II.

In summary, a search for stop pair production is pre-sented in final states with one isolated lepton, jets, and

missing transverse momentum in √s = 7 TeV pp

colli-sions corresponding to 4.7 fb−1 _{of ATLAS 2011 data.}

Each stop is assumed to decay to a top quark and a long-lived undetected neutral particle. No significant ex-cess of events above the rate predicted by the standard

model is observed and 95% CLs upper limits are set on

the stop mass in the stop-LSP mass plane, significantly extending previous stop-mass limits.

ACKNOWLEDGEMENTS

We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions

[GeV] 1 t ~ m 200 250 300 350 400 450 500 550 600 [GeV]0 1 r¾ m 0 50 100 150 200 250 300 t < m 1 0 r ¾ - m 1 t ~ m 1 0 r ¾ t A 1 t ~ production, 1 t ~ 1 t ~ ) exp m 1 ! Expected limit ( ) theory SUSY m 1 ! Observed limit ( ATLAS s All limits at 95% CL T miss 1-lepton + jets + E =7 TeV s , -1 L dt = 4.7 fb

0

excluded model cross sections [pb]s

Numbers give 95% CL 22.3 1.26 0.40 0.20 0.14 0.09 0.09 0.07 4.49 0.41 0.22 0.14 0.09 0.09 0.07 1.67 0.23 0.17 0.11 0.10 0.08 0.81 0.17 0.14 0.13 0.08 0.72 0.16 0.12 0.10

FIG. 2. Expected (dashed) and observed (solid curve) 95%

CLs excluded region (under the curve) in the plane of mχ˜0

1

vs. m˜t1, assuming BR(˜t1→ t ˜χ

0

1) = 100%. All uncertainties

except the signal cross-section uncertainties are included. The contours of the shaded band around the expected limit are the ±1 σ results. The dotted lines around the observed limit illustrate the change in the observed limit as the nominal signal cross section is scaled up and down by the theoretical

uncertainty. The overlaid numbers give the 95% CLs upper

limit on the signal cross section, in pb.

without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN;

CON-ICYT, Chile; CAS, MOST and NSFC, China; COL-CIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Founda-tion, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, 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 sup-port from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facili-ties at TRIUMF (Canada), NDGF (Denmark, 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.

[1] H. Miyazawa, Prog. Theor. Phys. 36, 1266 (1966). [2] R. Ramond, Phys. Rev. D 3, 2415 (1971).

[3] Y. Golfand and E. Likhtman, JETP Lett. 13, 323 (1971). [4] A. Neveu and J. Schwarz, Nucl. Phys. B 31, 86 (1971). [5] A. Neveu and J. Schwarz, Phys. Rev. D 4, 1109 (1971). [6] J. Gervais and B. Sakita, Nucl. Phys. B 34, 632 (1971). [7] D. Volkov and V. Akulov, Phys. Lett. B 46, 109 (1973). [8] J. Wess and B. Zumino, Phys. Lett. B 49, 52 (1974). [9] J. Wess and B. Zumino, Nucl. Phys. B 70, 39 (1974). [10] P. Fayet, Phys. Lett. B 64, 159 (1976).

[11] P. Fayet, Phys. Lett. B 69, 489 (1977).

[12] G. R. Farrar and P. Fayet, Phys. Lett. B 76, 575 (1978). [13] P. Fayet, Phys. Lett. B 84, 416 (1979).

[14] S. Dimopoulos and H. Georgi, Nucl. Phys. B 193, 150 (1981).

[15] R. Barbieri and G. Giudice, Nucl. Phys. B 306, 63 (1988).

[16] B. de Carlos and J. Casas, Phys. Lett. B 309, 320 (1993). [17] CDF Collaboration, Phys. Rev. Lett. 104, 251801 (2010). [18] D0 Collaboration, Phys. Lett. B 675, 289 (2009). [19] ATLAS Collaboration, Phys. Rev. D 85, 112006 (2012). [20] ATLAS Collaboration, Phys. Rev. Lett. 108, 241802

(2012).

[21] ATLAS Collaboration, arXiv:1206.1760 [hep-ex]. [22] CMS Collaboration, JHEP 1107, 113 (2011). [23] CMS Collaboration, arXiv:1205.3933 [hep-ex]. [24] ATLAS Collaboration, JINST 3, S08003 (2008). [25] ATLAS uses a right-handed coordinate system with its

origin at the nominal interaction point in the centre of the detector and the z-axis along the beam pipe.

Cylin-drical coordinates (r, φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity η is defined in terms of the polar angle θ

by η = − ln tan(θ/2), and ∆R =p(∆η)2_{+ (∆φ)}2_.

[26] ATLAS Collaboration, Eur. Phys. J. C 70, 823 (2010). [27] S. Agostinelli et al. (GEANT4), Nucl. Instrum. Meth. A

506, 250 (2003).

[28] ATLAS Collaboration, ATLAS-CONF-2012-064. [29] S. Frixione, E. Laenen, P. Motylinski, and B. R. Webber,

JHEP 03, 092 (2006).

[30] S. Frixione, E. Laenen, P. Motylinski, B. R. Webber, and C. D. White, JHEP 07, 029 (2008).

[31] M. L. Mangano, M. Moretti, F. Piccinini, R. Pittau, and A. D. Polosa, JHEP 07, 001 (2003).

[32] P. Nason, JHEP 0411, 040 (2004).

[33] S. Frixione, P. Nason, and C. Oleari, JHEP 0711, 070 (2007).

[34] S. Alioli, P. Nason, C. Oleari, and E. Re, JHEP 1006, 043 (2010).

[35] ATLAS Collaboration, Eur. Phys. J. C 72, 1 (2012). [36] B. P. Kersevan and E. Richter-Was,

arXiv:hep-ph/0405247 [hep-ph].

[37] G. Corcella et al., JHEP 01, 010 (2001). [38] J. Alwall et al., JHEP 09, 028 (2007).

[39] H.-L. Lai et al., Phys. Rev. D 82, 074024 (2010). [40] A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt,

Eur. Phys. J. C 63, 189 (2009).

[41] J. Pumplin et al., JHEP 07, 012 (2002).

[42] J. M. Butterworth, J. R. Forshaw, and M. H. Seymour, Z. Phys. C 72, 637 (1996).

[43] T. Sjostrand, S. Mrenna, and P. Z. Skands, JHEP 0605, 026 (2006).

[44] M. Aliev et al., Comput. Phys. Commun. 182, 1034 (2011).

[45] N. Kidonakis, Phys. Rev. D 83, 091503 (2011). [46] N. Kidonakis, Phys. Rev. D 82, 054018 (2010). [47] N. Kidonakis, Phys. Rev. D 81, 054028 (2010).

[48] J. M. Campbell and R. K. Ellis, arXiv:1204.5678

[hep-ph].

[49] R. Gavin, Y. Li, F. Petriello, and S. Quackenbush,

arXiv:1011.3540 [hep-ph].

[50] J. M. Campbell and R. K. Ellis, Phys. Rev. D 60, 113006 (1999).

[51] J. M. Campbell, R. K. Ellis, and C. Williams, JHEP

1107, 018.

[52] M. Bahr et al., Eur. Phys. J. C 58, 639 (2008).

[53] W. Beenakker, M. Kramer, T. Plehn, M. Spira, and

P. M. Zerwas, Nucl. Phys. B 515, 3 (1998). [54] W. Beenakker et al., JHEP. 1008, 098 (2010).

[55] W. Beenakker et al., Int. J. Mod. Phys. A 26, 2637 (2011).

[56] M. Kramer et al., arXiv:1206.2892 [hep-ph]. [57] ATLAS Collaboration, ATLAS-CONF-2012-020. [58] ATLAS Collaboration, Eur. Phys. J. C71, 1593 (2011). [59] ATLAS Collaboration, ATLAS-CONF-2011-063. [60] ATLAS Collaboration, Eur. Phys. J. C 72, 1909 (2012). [61] ATLAS Collaboration, Phys. Rev. D 85, 012006 (2012). [62] M. Cacciari, G. P. Salam, and G. Soyez, JHEP 04, 063

(2008).

[63] ATLAS Collaboration, arXiv:1112.6426 [hep-ex]. [64] ATLAS Collaboration, ATLAS-CONF-2012-043.

[65] mT is defined as m2T = 2p

lep

T E

miss

T (1 − cos(∆φ)), where

momentum direction. [66] A. Read, Journal of Physics G: Nucl. Part. Phys. 28, 2693 (2002).

The ATLAS Collaboration

G. Aad48_{, T. Abajyan}21_{, B. Abbott}111_{, J. Abdallah}12_{, S. Abdel Khalek}115_{, A.A. Abdelalim}49_{, O. Abdinov}11_,

R. Aben105_{, B. Abi}112_{, M. Abolins}88_{, O.S. AbouZeid}158_{, H. Abramowicz}153_{, H. Abreu}136_{, B.S. Acharya}164a,164b_,

L. Adamczyk38_{, D.L. Adams}25_{, T.N. Addy}56_{, J. Adelman}176_{, S. Adomeit}98_{, P. Adragna}75_{, T. Adye}129_{, S. Aefsky}23_,

J.A. Aguilar-Saavedra124b,a_{, M. Agustoni}17_{, M. Aharrouche}81_{, S.P. Ahlen}22_{, F. Ahles}48_{, A. Ahmad}148_{, M. Ahsan}41_,

G. Aielli133a,133b_{, T. Akdogan}19a_{, T.P.A. ˚Akesson}79_{, G. Akimoto}155_{, A.V. Akimov}94_{, M.S. Alam}2_{, M.A. Alam}76_,

J. Albert169_{, S. Albrand}55_{, M. Aleksa}30_{, I.N. Aleksandrov}64_{, F. Alessandria}89a_{, C. Alexa}26a_{, G. Alexander}153_,

G. Alexandre49_{, T. Alexopoulos}10_{, M. Alhroob}164a,164c_{, M. Aliev}16_{, G. Alimonti}89a_{, J. Alison}120_,

B.M.M. Allbrooke18_{, P.P. Allport}73_{, S.E. Allwood-Spiers}53_{, J. Almond}82_{, A. Aloisio}102a,102b_{, R. Alon}172_,

A. Alonso79_{, F. Alonso}70_{, A.D. Altheimer}35_{, B. Alvarez Gonzalez}88_{, M.G. Alviggi}102a,102b_{, K. Amako}65_,

C. Amelung23_{, V.V. Ammosov}128,∗_{, A. Amorim}124a,b_{, N. Amram}153_{, C. Anastopoulos}30_{, L.S. Ancu}17_{, N. Andari}115_,

T. Andeen35_{, C.F. Anders}58b_{, G. Anders}58a_{, K.J. Anderson}31_{, A. Andreazza}89a,89b_{, V. Andrei}58a_{, X.S. Anduaga}70_,

P. Anger44_{, A. Angerami}35_{, F. Anghinolfi}30_{, A. Anisenkov}107_{, N. Anjos}124a_{, A. Annovi}47_{, A. Antonaki}9_,

M. Antonelli47_{, A. Antonov}96_{, J. Antos}144b_{, F. Anulli}132a_{, M. Aoki}101_{, S. Aoun}83_{, L. Aperio Bella}5_{, R. Apolle}118,c_,

G. Arabidze88_{, I. Aracena}143_{, Y. Arai}65_{, A.T.H. Arce}45_{, S. Arfaoui}148_{, J-F. Arguin}15_{, E. Arik}19a,∗_{, M. Arik}19a_,

A.J. Armbruster87_{, O. Arnaez}81_{, V. Arnal}80_{, C. Arnault}115_{, A. Artamonov}95_{, G. Artoni}132a,132b_{, D. Arutinov}21_,

S. Asai155, R. Asfandiyarov173, S. Ask28, B. ˚Asman146a,146b, L. Asquith6, K. Assamagan25, A. Astbury169, M. Atkinson165, B. Aubert5, E. Auge115, K. Augsten127, M. Aurousseau145a, G. Avolio163, R. Avramidou10, D. Axen168, G. Azuelos93,d, Y. Azuma155, M.A. Baak30, G. Baccaglioni89a, C. Bacci134a,134b, A.M. Bach15, H. Bachacou136_{, K. Bachas}30_{, M. Backes}49_{, M. Backhaus}21_{, E. Badescu}26a_{, P. Bagnaia}132a,132b_{, S. Bahinipati}3_,

Y. Bai33a_{, D.C. Bailey}158_{, T. Bain}158_{, J.T. Baines}129_{, O.K. Baker}176_{, M.D. Baker}25_{, S. Baker}77_{, E. Banas}39_,

P. Banerjee93_{, Sw. Banerjee}173_{, D. Banfi}30_{, A. Bangert}150_{, V. Bansal}169_{, H.S. Bansil}18_{, L. Barak}172_{, S.P. Baranov}94_,

A. Barbaro Galtieri15_{, T. Barber}48_{, E.L. Barberio}86_{, D. Barberis}50a,50b_{, M. Barbero}21_{, D.Y. Bardin}64_{, T. Barillari}99_,

M. Barisonzi175_{, T. Barklow}143_{, N. Barlow}28_{, B.M. Barnett}129_{, R.M. Barnett}15_{, A. Baroncelli}134a_{, G. Barone}49_,

A.J. Barr118_{, F. Barreiro}80_{, J. Barreiro Guimar˜aes da Costa}57_{, P. Barrillon}115_{, R. Bartoldus}143_{, A.E. Barton}71_,

V. Bartsch149_{, A. Basye}165_{, R.L. Bates}53_{, L. Batkova}144a_{, J.R. Batley}28_{, A. Battaglia}17_{, M. Battistin}30_{, F. Bauer}136_,

H.S. Bawa143,e_{, S. Beale}98_{, T. Beau}78_{, P.H. Beauchemin}161_{, R. Beccherle}50a_{, P. Bechtle}21_{, H.P. Beck}17_,

A.K. Becker175_{, S. Becker}98_{, M. Beckingham}138_{, K.H. Becks}175_{, A.J. Beddall}19c_{, A. Beddall}19c_{, S. Bedikian}176_,

V.A. Bednyakov64_{, C.P. Bee}83_{, L.J. Beemster}105_{, M. Begel}25_{, S. Behar Harpaz}152_{, M. Beimforde}99_,

C. Belanger-Champagne85_{, P.J. Bell}49_{, W.H. Bell}49_{, G. Bella}153_{, L. Bellagamba}20a_{, F. Bellina}30_{, M. Bellomo}30_,

A. Belloni57_{, O. Beloborodova}107,f_{, K. Belotskiy}96_{, O. Beltramello}30_{, O. Benary}153_{, D. Benchekroun}135a_,

K. Bendtz146a,146b_{, N. Benekos}165_{, Y. Benhammou}153_{, E. Benhar Noccioli}49_{, J.A. Benitez Garcia}159b_,

D.P. Benjamin45_{, M. Benoit}115_{, J.R. Bensinger}23_{, K. Benslama}130_{, S. Bentvelsen}105_{, D. Berge}30_,

E. Bergeaas Kuutmann42_{, N. Berger}5_{, F. Berghaus}169_{, E. Berglund}105_{, J. Beringer}15_{, P. Bernat}77_{, R. Bernhard}48_,

C. Bernius25_{, T. Berry}76_{, C. Bertella}83_{, A. Bertin}20a,20b_{, F. Bertolucci}122a,122b_{, M.I. Besana}89a,89b_{, G.J. Besjes}104_,

N. Besson136_{, S. Bethke}99_{, W. Bhimji}46_{, R.M. Bianchi}30_{, M. Bianco}72a,72b_{, O. Biebel}98_{, S.P. Bieniek}77_,

K. Bierwagen54_{, J. Biesiada}15_{, M. Biglietti}134a_{, H. Bilokon}47_{, M. Bindi}20a,20b_{, S. Binet}115_{, A. Bingul}19c_,

C. Bini132a,132b_{, C. Biscarat}178_{, B. Bittner}99_{, K.M. Black}22_{, R.E. Blair}6_{, J.-B. Blanchard}136_{, G. Blanchot}30_,

T. Blazek144a_{, I. Bloch}42_{, C. Blocker}23_{, J. Blocki}39_{, A. Blondel}49_{, W. Blum}81_{, U. Blumenschein}54_{, G.J. Bobbink}105_,

V.B. Bobrovnikov107_{, S.S. Bocchetta}79_{, A. Bocci}45_{, C.R. Boddy}118_{, M. Boehler}48_{, J. Boek}175_{, N. Boelaert}36_,

J.A. Bogaerts30_{, A. Bogdanchikov}107_{, A. Bogouch}90,∗_{, C. Bohm}146a_{, J. Bohm}125_{, V. Boisvert}76_{, T. Bold}38_,

V. Boldea26a_{, N.M. Bolnet}136_{, M. Bomben}78_{, M. Bona}75_{, M. Boonekamp}136_{, S. Bordoni}78_{, C. Borer}17_,

A. Borisov128_{, G. Borissov}71_{, I. Borjanovic}13a_{, M. Borri}82_{, S. Borroni}87_{, V. Bortolotto}134a,134b_{, K. Bos}105_,

D. Boscherini20a_{, M. Bosman}12_{, H. Boterenbrood}105_{, J. Bouchami}93_{, J. Boudreau}123_{, E.V. Bouhova-Thacker}71_,

D. Boumediene34_{, C. Bourdarios}115_{, N. Bousson}83_{, A. Boveia}31_{, J. Boyd}30_{, I.R. Boyko}64_{, I. Bozovic-Jelisavcic}13b_,

J. Bracinik18, P. Branchini134a, A. Brandt8, G. Brandt118, O. Brandt54, U. Bratzler156, B. Brau84, J.E. Brau114, H.M. Braun175,∗, S.F. Brazzale164a,164c, B. Brelier158, J. Bremer30, K. Brendlinger120, R. Brenner166, S. Bressler172, D. Britton53, F.M. Brochu28, I. Brock21, R. Brock88, F. Broggi89a, C. Bromberg88, J. Bronner99, G. Brooijmans35,

T. Brooks76_{, W.K. Brooks}32b_{, G. Brown}82_{, H. Brown}8_{, P.A. Bruckman de Renstrom}39_{, D. Bruncko}144b_,

R. Bruneliere48_{, S. Brunet}60_{, A. Bruni}20a_{, G. Bruni}20a_{, M. Bruschi}20a_{, T. Buanes}14_{, Q. Buat}55_{, F. Bucci}49_,

J. Buchanan118_{, P. Buchholz}141_{, R.M. Buckingham}118_{, A.G. Buckley}46_{, S.I. Buda}26a_{, I.A. Budagov}64_{, B. Budick}108_,

V. B¨uscher81_{, L. Bugge}117_{, O. Bulekov}96_{, A.C. Bundock}73_{, M. Bunse}43_{, T. Buran}117_{, H. Burckhart}30_{, S. Burdin}73_,

T. Burgess14_{, S. Burke}129_{, E. Busato}34_{, P. Bussey}53_{, C.P. Buszello}166_{, B. Butler}143_{, J.M. Butler}22_{, C.M. Buttar}53_,

J.M. Butterworth77_{, W. Buttinger}28_{, S. Cabrera Urb´an}167_{, D. Caforio}20a,20b_{, O. Cakir}4a_{, P. Calafiura}15_,

R. Camacho Toro34_{, P. Camarri}133a,133b_{, D. Cameron}117_{, L.M. Caminada}15_{, R. Caminal Armadans}12_,

S. Campana30_{, M. Campanelli}77_{, V. Canale}102a,102b_{, F. Canelli}31,g_{, A. Canepa}159a_{, J. Cantero}80_{, R. Cantrill}76_,

L. Capasso102a,102b, M.D.M. Capeans Garrido30, I. Caprini26a, M. Caprini26a, D. Capriotti99, M. Capua37a,37b, R. Caputo81, R. Cardarelli133a, T. Carli30, G. Carlino102a, L. Carminati89a,89b, B. Caron85, S. Caron104, E. Carquin32b, G.D. Carrillo Montoya173, A.A. Carter75, J.R. Carter28, J. Carvalho124a,h, D. Casadei108,

M.P. Casado12_{, M. Cascella}122a,122b_{, C. Caso}50a,50b,∗_{, A.M. Castaneda Hernandez}173,i_{, E. Castaneda-Miranda}173_,

V. Castillo Gimenez167_{, N.F. Castro}124a_{, G. Cataldi}72a_{, P. Catastini}57_{, A. Catinaccio}30_{, J.R. Catmore}30_,

A. Cattai30_{, G. Cattani}133a,133b_{, S. Caughron}88_{, V. Cavaliere}165_{, P. Cavalleri}78_{, D. Cavalli}89a_{, M. Cavalli-Sforza}12_,

V. Cavasinni122a,122b_{, F. Ceradini}134a,134b_{, A.S. Cerqueira}24b_{, A. Cerri}30_{, L. Cerrito}75_{, F. Cerutti}47_{, S.A. Cetin}19b_,

A. Chafaq135a_{, D. Chakraborty}106_{, I. Chalupkova}126_{, K. Chan}3_{, P. Chang}165_{, B. Chapleau}85_{, J.D. Chapman}28_,

J.W. Chapman87_{, E. Chareyre}78_{, D.G. Charlton}18_{, V. Chavda}82_{, C.A. Chavez Barajas}30_{, S. Cheatham}85_,

S. Chekanov6_{, S.V. Chekulaev}159a_{, G.A. Chelkov}64_{, M.A. Chelstowska}104_{, C. Chen}63_{, H. Chen}25_{, S. Chen}33c_,

X. Chen173_{, Y. Chen}35_{, A. Cheplakov}64_{, R. Cherkaoui El Moursli}135e_{, V. Chernyatin}25_{, E. Cheu}7_{, S.L. Cheung}158_,

L. Chevalier136_{, G. Chiefari}102a,102b_{, L. Chikovani}51a,∗_{, J.T. Childers}30_{, A. Chilingarov}71_{, G. Chiodini}72a_,

A.S. Chisholm18_{, R.T. Chislett}77_{, A. Chitan}26a_{, M.V. Chizhov}64_{, G. Choudalakis}31_{, S. Chouridou}137_,

I.A. Christidi77_{, A. Christov}48_{, D. Chromek-Burckhart}30_{, M.L. Chu}151_{, J. Chudoba}125_{, G. Ciapetti}132a,132b_,

A.K. Ciftci4a_{, R. Ciftci}4a_{, D. Cinca}34_{, V. Cindro}74_{, C. Ciocca}20a,20b_{, A. Ciocio}15_{, M. Cirilli}87_{, P. Cirkovic}13b_,

M. Citterio89a_{, M. Ciubancan}26a_{, A. Clark}49_{, P.J. Clark}46_{, R.N. Clarke}15_{, W. Cleland}123_{, J.C. Clemens}83_,

B. Clement55_{, C. Clement}146a,146b_{, Y. Coadou}83_{, M. Cobal}164a,164c_{, A. Coccaro}138_{, J. Cochran}63_{, L. Coffey}23_,

J.G. Cogan143_{, J. Coggeshall}165_{, E. Cogneras}178_{, J. Colas}5_{, S. Cole}106_{, A.P. Colijn}105_{, N.J. Collins}18_,

C. Collins-Tooth53_{, J. Collot}55_{, T. Colombo}119a,119b_{, G. Colon}84_{, P. Conde Mui˜no}124a_{, E. Coniavitis}118_,

M.C. Conidi12_{, S.M. Consonni}89a,89b_{, V. Consorti}48_{, S. Constantinescu}26a_{, C. Conta}119a,119b_{, G. Conti}57_,

F. Conventi102a,j_{, M. Cooke}15_{, B.D. Cooper}77_{, A.M. Cooper-Sarkar}118_{, K. Copic}15_{, T. Cornelissen}175_{, M. Corradi}20a_,

F. Corriveau85,k_{, A. Cortes-Gonzalez}165_{, G. Cortiana}99_{, G. Costa}89a_{, M.J. Costa}167_{, D. Costanzo}139_{, D. Cˆot´e}30_,

L. Courneyea169_{, G. Cowan}76_{, C. Cowden}28_{, B.E. Cox}82_{, K. Cranmer}108_{, F. Crescioli}122a,122b_{, M. Cristinziani}21_,

G. Crosetti37a,37b_{, S. Cr´ep´e-Renaudin}55_{, C.-M. Cuciuc}26a_{, C. Cuenca Almenar}176_{, T. Cuhadar Donszelmann}139_,

M. Curatolo47_{, C.J. Curtis}18_{, C. Cuthbert}150_{, P. Cwetanski}60_{, H. Czirr}141_{, P. Czodrowski}44_{, Z. Czyczula}176_,

S. D’Auria53_{, M. D’Onofrio}73_{, A. D’Orazio}132a,132b_{, M.J. Da Cunha Sargedas De Sousa}124a_{, C. Da Via}82_,

W. Dabrowski38_{, A. Dafinca}118_{, T. Dai}87_{, C. Dallapiccola}84_{, M. Dam}36_{, M. Dameri}50a,50b_{, D.S. Damiani}137_,

H.O. Danielsson30_{, V. Dao}49_{, G. Darbo}50a_{, G.L. Darlea}26b_{, J.A. Dassoulas}42_{, W. Davey}21_{, T. Davidek}126_,

N. Davidson86_{, R. Davidson}71_{, E. Davies}118,c_{, M. Davies}93_{, O. Davignon}78_{, A.R. Davison}77_{, Y. Davygora}58a_,

E. Dawe142_{, I. Dawson}139_{, R.K. Daya-Ishmukhametova}23_{, K. De}8_{, R. de Asmundis}102a_{, S. De Castro}20a,20b_,

S. De Cecco78_{, J. de Graat}98_{, N. De Groot}104_{, P. de Jong}105_{, C. De La Taille}115_{, H. De la Torre}80_{, F. De Lorenzi}63_,

L. de Mora71_{, L. De Nooij}105_{, D. De Pedis}132a_{, A. De Salvo}132a_{, U. De Sanctis}164a,164c_{, A. De Santo}149_,

J.B. De Vivie De Regie115_{, G. De Zorzi}132a,132b_{, W.J. Dearnaley}71_{, R. Debbe}25_{, C. Debenedetti}46_{, B. Dechenaux}55_,

D.V. Dedovich64_{, J. Degenhardt}120_{, C. Del Papa}164a,164c_{, J. Del Peso}80_{, T. Del Prete}122a,122b_{, T. Delemontex}55_,

M. Deliyergiyev74_{, A. Dell’Acqua}30_{, L. Dell’Asta}22_{, M. Della Pietra}102a,j_{, D. della Volpe}102a,102b_{, M. Delmastro}5_,

P.A. Delsart55_{, C. Deluca}105_{, S. Demers}176_{, M. Demichev}64_{, B. Demirkoz}12,l_{, J. Deng}163_{, S.P. Denisov}128_,

D. Derendarz39_{, J.E. Derkaoui}135d_{, F. Derue}78_{, P. Dervan}73_{, K. Desch}21_{, E. Devetak}148_{, P.O. Deviveiros}105_,

A. Dewhurst129_{, B. DeWilde}148_{, S. Dhaliwal}158_{, R. Dhullipudi}25,m_{, A. Di Ciaccio}133a,133b_{, L. Di Ciaccio}5_,

A. Di Girolamo30_{, B. Di Girolamo}30_{, S. Di Luise}134a,134b_{, A. Di Mattia}173_{, B. Di Micco}30_{, R. Di Nardo}47_,

A. Di Simone133a,133b_{, R. Di Sipio}20a,20b_{, M.A. Diaz}32a_{, E.B. Diehl}87_{, J. Dietrich}42_{, T.A. Dietzsch}58a_{, S. Diglio}86_,

K. Dindar Yagci40_{, J. Dingfelder}21_{, F. Dinut}26a_{, C. Dionisi}132a,132b_{, P. Dita}26a_{, S. Dita}26a_{, F. Dittus}30_{, F. Djama}83_,

T. Djobava51b_{, M.A.B. do Vale}24c_{, A. Do Valle Wemans}124a,n_{, T.K.O. Doan}5_{, M. Dobbs}85_{, R. Dobinson}30,∗_,

D. Dobos30_{, E. Dobson}30,o_{, J. Dodd}35_{, C. Doglioni}49_{, T. Doherty}53_{, Y. Doi}65,∗_{, J. Dolejsi}126_{, I. Dolenc}74_,

Z. Dolezal126_{, B.A. Dolgoshein}96,∗_{, T. Dohmae}155_{, M. Donadelli}24d_{, J. Donini}34_{, J. Dopke}30_{, A. Doria}102a_,

A. Dos Anjos173_{, A. Dotti}122a,122b_{, M.T. Dova}70_{, A.D. Doxiadis}105_{, A.T. Doyle}53_{, M. Dris}10_{, J. Dubbert}99_,

S. Dube15, E. Duchovni172, G. Duckeck98, D. Duda175, A. Dudarev30, F. Dudziak63, M. D¨uhrssen30,

I.P. Duerdoth82_{, L. Duflot}115_{, M-A. Dufour}85_{, L. Duguid}76_{, M. Dunford}30_{, H. Duran Yildiz}4a_{, R. Duxfield}139_,

M. Dwuznik38_{, F. Dydak}30_{, M. D¨uren}52_{, J. Ebke}98_{, S. Eckweiler}81_{, K. Edmonds}81_{, W. Edson}2_{, C.A. Edwards}76_,

N.C. Edwards53_{, W. Ehrenfeld}42_{, T. Eifert}143_{, G. Eigen}14_{, K. Einsweiler}15_{, E. Eisenhandler}75_{, T. Ekelof}166_,

M. El Kacimi135c_{, M. Ellert}166_{, S. Elles}5_{, F. Ellinghaus}81_{, K. Ellis}75_{, N. Ellis}30_{, J. Elmsheuser}98_{, M. Elsing}30_,

D. Emeliyanov129_{, R. Engelmann}148_{, A. Engl}98_{, B. Epp}61_{, J. Erdmann}54_{, A. Ereditato}17_{, D. Eriksson}146a_{, J. Ernst}2_,

M. Ernst25_{, J. Ernwein}136_{, D. Errede}165_{, S. Errede}165_{, E. Ertel}81_{, M. Escalier}115_{, H. Esch}43_{, C. Escobar}123_,

X. Espinal Curull12_{, B. Esposito}47_{, F. Etienne}83_{, A.I. Etienvre}136_{, E. Etzion}153_{, D. Evangelakou}54_{, H. Evans}60_,

A. Farilla134a_{, J. Farley}148_{, T. Farooque}158_{, S. Farrell}163_{, S.M. Farrington}170_{, P. Farthouat}30_{, F. Fassi}167_,

P. Fassnacht30_{, D. Fassouliotis}9_{, B. Fatholahzadeh}158_{, A. Favareto}89a,89b_{, L. Fayard}115_{, S. Fazio}37a,37b_,

R. Febbraro34, P. Federic144a, O.L. Fedin121, W. Fedorko88, M. Fehling-Kaschek48, L. Feligioni83, D. Fellmann6, C. Feng33d, E.J. Feng6, A.B. Fenyuk128, J. Ferencei144b, W. Fernando6, S. Ferrag53, J. Ferrando53, V. Ferrara42, A. Ferrari166, P. Ferrari105, R. Ferrari119a, D.E. Ferreira de Lima53, A. Ferrer167, D. Ferrere49, C. Ferretti87, A. Ferretto Parodi50a,50b_{, M. Fiascaris}31_{, F. Fiedler}81_{, A. Filipˇciˇc}74_{, F. Filthaut}104_{, M. Fincke-Keeler}169_,

M.C.N. Fiolhais124a,h_{, L. Fiorini}167_{, A. Firan}40_{, G. Fischer}42_{, M.J. Fisher}109_{, M. Flechl}48_{, I. Fleck}141_{, J. Fleckner}81_,

P. Fleischmann174_{, S. Fleischmann}175_{, T. Flick}175_{, A. Floderus}79_{, L.R. Flores Castillo}173_{, M.J. Flowerdew}99_,

T. Fonseca Martin17_{, A. Formica}136_{, A. Forti}82_{, D. Fortin}159a_{, D. Fournier}115_{, H. Fox}71_{, P. Francavilla}12_,

M. Franchini20a,20b_{, S. Franchino}119a,119b_{, D. Francis}30_{, T. Frank}172_{, S. Franz}30_{, M. Fraternali}119a,119b_{, S. Fratina}120_,

S.T. French28_{, C. Friedrich}42_{, F. Friedrich}44_{, R. Froeschl}30_{, D. Froidevaux}30_{, J.A. Frost}28_{, C. Fukunaga}156_,

E. Fullana Torregrosa30_{, B.G. Fulsom}143_{, J. Fuster}167_{, C. Gabaldon}30_{, O. Gabizon}172_{, T. Gadfort}25_{, S. Gadomski}49_,

G. Gagliardi50a,50b_{, P. Gagnon}60_{, C. Galea}98_{, E.J. Gallas}118_{, V. Gallo}17_{, B.J. Gallop}129_{, P. Gallus}125_{, K.K. Gan}109_,

Y.S. Gao143,e_{, A. Gaponenko}15_{, F. Garberson}176_{, M. Garcia-Sciveres}15_{, C. Garc´ıa}167_{, J.E. Garc´ıa Navarro}167_,

R.W. Gardner31_{, N. Garelli}30_{, H. Garitaonandia}105_{, V. Garonne}30_{, C. Gatti}47_{, G. Gaudio}119a_{, B. Gaur}141_,

L. Gauthier136_{, P. Gauzzi}132a,132b_{, I.L. Gavrilenko}94_{, C. Gay}168_{, G. Gaycken}21_{, E.N. Gazis}10_{, P. Ge}33d_{, Z. Gecse}168_,

C.N.P. Gee129_{, D.A.A. Geerts}105_{, Ch. Geich-Gimbel}21_{, K. Gellerstedt}146a,146b_{, C. Gemme}50a_{, A. Gemmell}53_,

M.H. Genest55_{, S. Gentile}132a,132b_{, M. George}54_{, S. George}76_{, P. Gerlach}175_{, A. Gershon}153_{, C. Geweniger}58a_,

H. Ghazlane135b_{, N. Ghodbane}34_{, B. Giacobbe}20a_{, S. Giagu}132a,132b_{, V. Giakoumopoulou}9_{, V. Giangiobbe}12_,

F. Gianotti30_{, B. Gibbard}25_{, A. Gibson}158_{, S.M. Gibson}30_{, D. Gillberg}29_{, A.R. Gillman}129_{, D.M. Gingrich}3,d_,

J. Ginzburg153_{, N. Giokaris}9_{, M.P. Giordani}164c_{, R. Giordano}102a,102b_{, F.M. Giorgi}16_{, P. Giovannini}99_,

P.F. Giraud136_{, D. Giugni}89a_{, M. Giunta}93_{, P. Giusti}20a_{, B.K. Gjelsten}117_{, L.K. Gladilin}97_{, C. Glasman}80_,

J. Glatzer48_{, A. Glazov}42_{, K.W. Glitza}175_{, G.L. Glonti}64_{, J.R. Goddard}75_{, J. Godfrey}142_{, J. Godlewski}30_,

M. Goebel42_{, T. G¨opfert}44_{, C. Goeringer}81_{, C. G¨ossling}43_{, S. Goldfarb}87_{, T. Golling}176_{, A. Gomes}124a,b_,

L.S. Gomez Fajardo42_{, R. Gon¸calo}76_{, J. Goncalves Pinto Firmino Da Costa}42_{, L. Gonella}21_{, S. Gonz´alez de la}

Hoz167_{, G. Gonzalez Parra}12_{, M.L. Gonzalez Silva}27_{, S. Gonzalez-Sevilla}49_{, J.J. Goodson}148_{, L. Goossens}30_,

P.A. Gorbounov95_{, H.A. Gordon}25_{, I. Gorelov}103_{, G. Gorfine}175_{, B. Gorini}30_{, E. Gorini}72a,72b_{, A. Goriˇsek}74_,

E. Gornicki39_{, B. Gosdzik}42_{, A.T. Goshaw}6_{, M. Gosselink}105_{, M.I. Gostkin}64_{, I. Gough Eschrich}163_{, M. Gouighri}135a_,

D. Goujdami135c_{, M.P. Goulette}49_{, A.G. Goussiou}138_{, C. Goy}5_{, S. Gozpinar}23_{, I. Grabowska-Bold}38_,

P. Grafstr¨om20a,20b_{, K-J. Grahn}42_{, F. Grancagnolo}72a_{, S. Grancagnolo}16_{, V. Grassi}148_{, V. Gratchev}121_{, N. Grau}35_,

H.M. Gray30_{, J.A. Gray}148_{, E. Graziani}134a_{, O.G. Grebenyuk}121_{, T. Greenshaw}73_{, Z.D. Greenwood}25,m_,

K. Gregersen36_{, I.M. Gregor}42_{, P. Grenier}143_{, J. Griffiths}8_{, N. Grigalashvili}64_{, A.A. Grillo}137_{, S. Grinstein}12_,

Ph. Gris34_{, Y.V. Grishkevich}97_{, J.-F. Grivaz}115_{, E. Gross}172_{, J. Grosse-Knetter}54_{, J. Groth-Jensen}172_{, K. Grybel}141_,

D. Guest176_{, C. Guicheney}34_{, S. Guindon}54_{, U. Gul}53_{, H. Guler}85,p_{, J. Gunther}125_{, B. Guo}158_{, J. Guo}35_,

P. Gutierrez111_{, N. Guttman}153_{, O. Gutzwiller}173_{, C. Guyot}136_{, C. Gwenlan}118_{, C.B. Gwilliam}73_{, A. Haas}143_,

S. Haas30_{, C. Haber}15_{, H.K. Hadavand}40_{, D.R. Hadley}18_{, P. Haefner}21_{, F. Hahn}30_{, S. Haider}30_{, Z. Hajduk}39_,

H. Hakobyan177_{, D. Hall}118_{, J. Haller}54_{, K. Hamacher}175_{, P. Hamal}113_{, M. Hamer}54_{, A. Hamilton}145b,q_,

S. Hamilton161_{, L. Han}33b_{, K. Hanagaki}116_{, K. Hanawa}160_{, M. Hance}15_{, C. Handel}81_{, P. Hanke}58a_{, J.R. Hansen}36_,

J.B. Hansen36_{, J.D. Hansen}36_{, P.H. Hansen}36_{, P. Hansson}143_{, K. Hara}160_{, G.A. Hare}137_{, T. Harenberg}175_,

S. Harkusha90_{, D. Harper}87_{, R.D. Harrington}46_{, O.M. Harris}138_{, J. Hartert}48_{, F. Hartjes}105_{, T. Haruyama}65_,

A. Harvey56_{, S. Hasegawa}101_{, Y. Hasegawa}140_{, S. Hassani}136_{, S. Haug}17_{, M. Hauschild}30_{, R. Hauser}88_,

M. Havranek21_{, C.M. Hawkes}18_{, R.J. Hawkings}30_{, A.D. Hawkins}79_{, T. Hayakawa}66_{, T. Hayashi}160_{, D. Hayden}76_,

C.P. Hays118_{, H.S. Hayward}73_{, S.J. Haywood}129_{, S.J. Head}18_{, V. Hedberg}79_{, L. Heelan}8_{, S. Heim}88_,

B. Heinemann15_{, S. Heisterkamp}36_{, L. Helary}22_{, C. Heller}98_{, M. Heller}30_{, S. Hellman}146a,146b_{, D. Hellmich}21_,

C. Helsens12_{, R.C.W. Henderson}71_{, M. Henke}58a_{, A. Henrichs}54_{, A.M. Henriques Correia}30_{, S. Henrot-Versille}115_,

C. Hensel54_{, T. Henß}175_{, C.M. Hernandez}8_{, Y. Hern´andez Jim´enez}167_{, R. Herrberg}16_{, G. Herten}48_,

R. Hertenberger98_{, L. Hervas}30_{, G.G. Hesketh}77_{, N.P. Hessey}105_{, E. Hig´on-Rodriguez}167_{, J.C. Hill}28_{, K.H. Hiller}42_,

S. Hillert21, S.J. Hillier18, I. Hinchliffe15, E. Hines120, M. Hirose116, F. Hirsch43, D. Hirschbuehl175, J. Hobbs148, N. Hod153_{, M.C. Hodgkinson}139_{, P. Hodgson}139_{, A. Hoecker}30_{, M.R. Hoeferkamp}103_{, J. Hoffman}40_{, D. Hoffmann}83_,

M. Hohlfeld81_{, M. Holder}141_{, S.O. Holmgren}146a_{, T. Holy}127_{, J.L. Holzbauer}88_{, T.M. Hong}120_,

L. Hooft van Huysduynen108_{, S. Horner}48_{, J-Y. Hostachy}55_{, S. Hou}151_{, A. Hoummada}135a_{, J. Howard}118_,

J. Howarth82_{, I. Hristova}16_{, J. Hrivnac}115_{, T. Hryn’ova}5_{, P.J. Hsu}81_{, S.-C. Hsu}15_{, D. Hu}35_{, Z. Hubacek}127_,

F. Hubaut83_{, F. Huegging}21_{, A. Huettmann}42_{, T.B. Huffman}118_{, E.W. Hughes}35_{, G. Hughes}71_{, M. Huhtinen}30_,

M. Hurwitz15_{, U. Husemann}42_{, N. Huseynov}64,r_{, J. Huston}88_{, J. Huth}57_{, G. Iacobucci}49_{, G. Iakovidis}10_,

M. Ibbotson82_{, I. Ibragimov}141_{, L. Iconomidou-Fayard}115_{, J. Idarraga}115_{, P. Iengo}102a_{, O. Igonkina}105_{, Y. Ikegami}65_,

V. Ippolito132a,132b_{, A. Irles Quiles}167_{, C. Isaksson}166_{, M. Ishino}67_{, M. Ishitsuka}157_{, R. Ishmukhametov}40_,

C. Issever118_{, S. Istin}19a_{, A.V. Ivashin}128_{, W. Iwanski}39_{, H. Iwasaki}65_{, J.M. Izen}41_{, V. Izzo}102a_{, B. Jackson}120_,

J.N. Jackson73, P. Jackson1, M.R. Jaekel30, V. Jain60, K. Jakobs48, S. Jakobsen36, T. Jakoubek125, J. Jakubek127, D.K. Jana111, E. Jansen77, H. Jansen30, A. Jantsch99, M. Janus48, G. Jarlskog79, L. Jeanty57, I. Jen-La Plante31, D. Jennens86, P. Jenni30, A.E. Loevschall-Jensen36, P. Jeˇz36, S. J´ez´equel5, M.K. Jha20a, H. Ji173, W. Ji81, J. Jia148, Y. Jiang33b_{, M. Jimenez Belenguer}42_{, S. Jin}33a_{, O. Jinnouchi}157_{, M.D. Joergensen}36_{, D. Joffe}40_,

M. Johansen146a,146b_{, K.E. Johansson}146a_{, P. Johansson}139_{, S. Johnert}42_{, K.A. Johns}7_{, K. Jon-And}146a,146b_,

G. Jones170_{, R.W.L. Jones}71_{, T.J. Jones}73_{, C. Joram}30_{, P.M. Jorge}124a_{, K.D. Joshi}82_{, J. Jovicevic}147_{, T. Jovin}13b_,

X. Ju173_{, C.A. Jung}43_{, R.M. Jungst}30_{, V. Juranek}125_{, P. Jussel}61_{, A. Juste Rozas}12_{, S. Kabana}17_{, M. Kaci}167_,

A. Kaczmarska39_{, P. Kadlecik}36_{, M. Kado}115_{, H. Kagan}109_{, M. Kagan}57_{, E. Kajomovitz}152_{, S. Kalinin}175_,

L.V. Kalinovskaya64_{, S. Kama}40_{, N. Kanaya}155_{, M. Kaneda}30_{, S. Kaneti}28_{, T. Kanno}157_{, V.A. Kantserov}96_,

J. Kanzaki65_{, B. Kaplan}108_{, A. Kapliy}31_{, J. Kaplon}30_{, D. Kar}53_{, M. Karagounis}21_{, K. Karakostas}10_,

M. Karnevskiy42_{, V. Kartvelishvili}71_{, A.N. Karyukhin}128_{, L. Kashif}173_{, G. Kasieczka}58b_{, R.D. Kass}109_,

A. Kastanas14_{, M. Kataoka}5_{, Y. Kataoka}155_{, E. Katsoufis}10_{, J. Katzy}42_{, V. Kaushik}7_{, K. Kawagoe}69_,

T. Kawamoto155_{, G. Kawamura}81_{, M.S. Kayl}105_{, S. Kazama}155_{, V.A. Kazanin}107_{, M.Y. Kazarinov}64_{, R. Keeler}169_,

R. Kehoe40_{, M. Keil}54_{, G.D. Kekelidze}64_{, J.S. Keller}138_{, M. Kenyon}53_{, O. Kepka}125_{, N. Kerschen}30_{, B.P. Kerˇsevan}74_,

S. Kersten175_{, K. Kessoku}155_{, J. Keung}158_{, F. Khalil-zada}11_{, H. Khandanyan}146a,146b_{, A. Khanov}112_,

D. Kharchenko64_{, A. Khodinov}96_{, A. Khomich}58a_{, T.J. Khoo}28_{, G. Khoriauli}21_{, A. Khoroshilov}175_{, V. Khovanskiy}95_,

E. Khramov64_{, J. Khubua}51b_{, H. Kim}146a,146b_{, S.H. Kim}160_{, N. Kimura}171_{, O. Kind}16_{, B.T. King}73_{, M. King}66_,

R.S.B. King118_{, J. Kirk}129_{, A.E. Kiryunin}99_{, T. Kishimoto}66_{, D. Kisielewska}38_{, T. Kitamura}66_{, T. Kittelmann}123_,

K. Kiuchi160_{, E. Kladiva}144b_{, M. Klein}73_{, U. Klein}73_{, K. Kleinknecht}81_{, M. Klemetti}85_{, A. Klier}172_,

P. Klimek146a,146b_{, A. Klimentov}25_{, R. Klingenberg}43_{, J.A. Klinger}82_{, E.B. Klinkby}36_{, T. Klioutchnikova}30_,

P.F. Klok104_{, S. Klous}105_{, E.-E. Kluge}58a_{, T. Kluge}73_{, P. Kluit}105_{, S. Kluth}99_{, N.S. Knecht}158_{, E. Kneringer}61_,

E.B.F.G. Knoops83_{, A. Knue}54_{, B.R. Ko}45_{, T. Kobayashi}155_{, M. Kobel}44_{, M. Kocian}143_{, P. Kodys}126_{, K. K¨oneke}30_,

A.C. K¨onig104_{, S. Koenig}81_{, L. K¨opke}81_{, F. Koetsveld}104_{, P. Koevesarki}21_{, T. Koffas}29_{, E. Koffeman}105_,

L.A. Kogan118_{, S. Kohlmann}175_{, F. Kohn}54_{, Z. Kohout}127_{, T. Kohriki}65_{, T. Koi}143_{, G.M. Kolachev}107,∗_,

H. Kolanoski16_{, V. Kolesnikov}64_{, I. Koletsou}89a_{, J. Koll}88_{, A.A. Komar}94_{, Y. Komori}155_{, T. Kondo}65_{, T. Kono}42,s_,

A.I. Kononov48_{, R. Konoplich}108,t_{, N. Konstantinidis}77_{, S. Koperny}38_{, K. Korcyl}39_{, K. Kordas}154_{, A. Korn}118_,

A. Korol107_{, I. Korolkov}12_{, E.V. Korolkova}139_{, V.A. Korotkov}128_{, O. Kortner}99_{, S. Kortner}99_{, V.V. Kostyukhin}21_,

S. Kotov99_{, V.M. Kotov}64_{, A. Kotwal}45_{, C. Kourkoumelis}9_{, V. Kouskoura}154_{, A. Koutsman}159a_{, R. Kowalewski}169_,

T.Z. Kowalski38_{, W. Kozanecki}136_{, A.S. Kozhin}128_{, V. Kral}127_{, V.A. Kramarenko}97_{, G. Kramberger}74_,

M.W. Krasny78_{, A. Krasznahorkay}108_{, J.K. Kraus}21_{, S. Kreiss}108_{, F. Krejci}127_{, J. Kretzschmar}73_{, N. Krieger}54_,

P. Krieger158_{, K. Kroeninger}54_{, H. Kroha}99_{, J. Kroll}120_{, J. Kroseberg}21_{, J. Krstic}13a_{, U. Kruchonak}64_{, H. Kr¨uger}21_,

T. Kruker17_{, N. Krumnack}63_{, Z.V. Krumshteyn}64_{, T. Kubota}86_{, S. Kuday}4a_{, S. Kuehn}48_{, A. Kugel}58c_{, T. Kuhl}42_,

D. Kuhn61_{, V. Kukhtin}64_{, Y. Kulchitsky}90_{, S. Kuleshov}32b_{, C. Kummer}98_{, M. Kuna}78_{, J. Kunkle}120_{, A. Kupco}125_,

H. Kurashige66_{, M. Kurata}160_{, Y.A. Kurochkin}90_{, V. Kus}125_{, E.S. Kuwertz}147_{, M. Kuze}157_{, J. Kvita}142_{, R. Kwee}16_,

A. La Rosa49_{, L. La Rotonda}37a,37b_{, L. Labarga}80_{, J. Labbe}5_{, S. Lablak}135a_{, C. Lacasta}167_{, F. Lacava}132a,132b_,

H. Lacker16_{, D. Lacour}78_{, V.R. Lacuesta}167_{, E. Ladygin}64_{, R. Lafaye}5_{, B. Laforge}78_{, T. Lagouri}176_{, S. Lai}48_,

E. Laisne55_{, M. Lamanna}30_{, L. Lambourne}77_{, C.L. Lampen}7_{, W. Lampl}7_{, E. Lancon}136_{, U. Landgraf}48_,

M.P.J. Landon75_{, J.L. Lane}82_{, V.S. Lang}58a_{, C. Lange}42_{, A.J. Lankford}163_{, F. Lanni}25_{, K. Lantzsch}175_{, S. Laplace}78_,

C. Lapoire21_{, J.F. Laporte}136_{, T. Lari}89a_{, A. Larner}118_{, M. Lassnig}30_{, P. Laurelli}47_{, V. Lavorini}37a,37b_,

W. Lavrijsen15_{, P. Laycock}73_{, O. Le Dortz}78_{, E. Le Guirriec}83_{, E. Le Menedeu}12_{, T. LeCompte}6_,

F. Ledroit-Guillon55_{, H. Lee}105_{, J.S.H. Lee}116_{, S.C. Lee}151_{, L. Lee}176_{, M. Lefebvre}169_{, M. Legendre}136_{, F. Legger}98_,

C. Leggett15_{, M. Lehmacher}21_{, G. Lehmann Miotto}30_{, X. Lei}7_{, M.A.L. Leite}24d_{, R. Leitner}126_{, D. Lellouch}172_,

B. Lemmer54_{, V. Lendermann}58a_{, K.J.C. Leney}145b_{, T. Lenz}105_{, G. Lenzen}175_{, B. Lenzi}30_{, K. Leonhardt}44_,

S. Leontsinis10_{, F. Lepold}58a_{, C. Leroy}93_{, J-R. Lessard}169_{, C.G. Lester}28_{, C.M. Lester}120_{, J. Levˆeque}5_{, D. Levin}87_,

L.J. Levinson172_{, A. Lewis}118_{, G.H. Lewis}108_{, A.M. Leyko}21_{, M. Leyton}16_{, B. Li}83_{, H. Li}173,u_{, S. Li}33b,v_{, X. Li}87_,

Z. Liang118,w, H. Liao34, B. Liberti133a, P. Lichard30, M. Lichtnecker98, K. Lie165, W. Liebig14, C. Limbach21, A. Limosani86_{, M. Limper}62_{, S.C. Lin}151,x_{, F. Linde}105_{, J.T. Linnemann}88_{, E. Lipeles}120_{, A. Lipniacka}14_,

T.M. Liss165_{, D. Lissauer}25_{, A. Lister}49_{, A.M. Litke}137_{, C. Liu}29_{, D. Liu}151_{, H. Liu}87_{, J.B. Liu}87_{, L. Liu}87_,

M. Liu33b_{, Y. Liu}33b_{, M. Livan}119a,119b_{, S.S.A. Livermore}118_{, A. Lleres}55_{, J. Llorente Merino}80_{, S.L. Lloyd}75_,

E. Lobodzinska42_{, P. Loch}7_{, W.S. Lockman}137_{, T. Loddenkoetter}21_{, F.K. Loebinger}82_{, A. Loginov}176_{, C.W. Loh}168_,

T. Lohse16_{, K. Lohwasser}48_{, M. Lokajicek}125_{, V.P. Lombardo}5_{, R.E. Long}71_{, L. Lopes}124a_{, D. Lopez Mateos}57_,

J. Lorenz98_{, N. Lorenzo Martinez}115_{, M. Losada}162_{, P. Loscutoff}15_{, F. Lo Sterzo}132a,132b_{, M.J. Losty}159a,∗_{, X. Lou}41_,

A. Lounis115_{, K.F. Loureiro}162_{, J. Love}6_{, P.A. Love}71_{, A.J. Lowe}143,e_{, F. Lu}33a_{, H.J. Lubatti}138_{, C. Luci}132a,132b_,