Search for a heavy narrow resonance decaying to e mu, e tau, or mu tau with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC

arXiv:1212.1272v2 [hep-ex] 7 Dec 2012

EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)

CERN-PH-EP-2012-326

Submitted to: Physics Letters B

Search for a heavy narrow resonance decaying to

eµ

,

eτ

, or

µτ

with the ATLAS detector in

√

s = 7

TeV

pp

collisions at the LHC

The ATLAS Collaboration

Abstract

This letter presents the results of a search for a heavy particle decaying into an e±_µ∓_{, e}±_τ∓_{, or}

µ±_τ∓_{final state inppcollisions at}√_{s = 7TeV. The data were recorded with the ATLAS detector at the}

LHC during 2011 and correspond to an integrated luminosity of 4.6 fb−1. No significant excess above the Standard Model expectation is observed, and exclusions at 95% confidence level are placed on the cross section times branching ratio for the production of anR-parity-violating supersymmetric tau sneutrino. These results considerably extend constraints from Tevatron experiments.

Search for a heavy narrow resonance decaying to

eµ, eτ , or µτ with

the ATLAS detector in

√

s = 7 TeV pp collisions at the LHC

The ATLAS Collaboration

Abstract

This letter presents the results of a search for a heavy particle decaying into an e±_µ∓_{, e}±_τ∓_,

or µ±_τ∓ _{final state in pp collisions at}√_{s = 7 TeV. The data were recorded with the ATLAS}

detector at the LHC during 2011 and correspond to an integrated luminosity of 4.6 fb−1_.

No significant excess above the Standard Model expectation is observed, and exclusions at 95% confidence level are placed on the cross section times branching ratio for the production of an R-parity-violating supersymmetric tau sneutrino. These results considerably extend constraints from Tevatron experiments.

1. Introduction

Neutrino oscillations show that lepton-flavour quantum numbers are not conserved

in Nature. On the other hand,

lepton-flavour violation (LFV) has not been ob-served in the charged lepton sector, where neutrino-induced LFV is predicted to be ex-tremely small in the Standard Model (SM). The study of possible LFV processes involv-ing charged leptons is an important topic in the search for physics beyond the SM. One possible signature is the production of a particle that decays to a pair of different

flavour, opposite-sign leptons e±_µ∓ _(eµ),

e±_τ∓_{(eτ ), or µ}±_τ∓ _{(µτ ) (referred to}

generi-cally as ℓℓ′_{). Since leptons with large}

trans-verse momenta are identified cleanly, effi-ciently, and with good resolution, the AT-LAS detector is well suited to a search for this signature. Many new physics models al-low LFV in charged lepton interactions. For example, in R-parity-violating (RPV) mod-els of supersymmetry (SUSY) [1], a

sneu-trino can have LFV decays to ℓℓ′_{. Models}

with additional gauge symmetry can

accom-modate an ℓℓ′ _{signature through LFV}

de-cays of an extra gauge boson Z′ _{[2]. This}

signature is also produced in the SM

frame-work, for example, t¯t, W W , or Z/γ∗ _→

τ−_τ+ _{production where the final-state}

par-ticles decay to leptons of different flavour. These processes typically have small cross

sections, and the ℓℓ′ _{invariant mass (m}

ℓℓ′)

lies predominantly below the range favoured for new physics signals.

This letter reports on a search for a heavy particle decaying into the eµ, eτhad, or µτhad

final state, where τhad is a τ lepton that

de-cays hadronically. The search uses 4.6 fb−1

of 7 TeV pp collision data taken with the ATLAS detector during 2011. The results are interpreted in terms of the production

via d ¯d annhiliation and subsequent decay of

a tau sneutrino ˜ντ in RPV SUSY (d ¯d →

˜

ντ → ℓℓ′). Both the CDF and D0

re-ported searches for the RPV production and

decay of a ˜ντ in the eµ channel [3]. The

CDF Collaboration also set limits in the eτ and µτ channels [3]. This letter supersedes previous ATLAS searches for a high-mass

resonance decaying to eµ based on 1 fb−1

of 2011 data [4] and extends the search to eτhad and µτhad final states.

Precision low-energy searches, such as µ to e conversion on nuclei, rare muon decays, and rare tau decays, place limits on RPV couplings [5]. These limits often depend on masses of supersymmetric particles that oc-cur in loop diagrams and often need to as-sume the dominance of certain couplings or pairs of couplings to extract limits.

2. ATLAS detector

The ATLAS experiment at the LHC em-ploys a multipurpose particle physics detec-tor [6] with a forward-backward symmetric cylindrical geometry and near 4π coverage

in solid angle.1 _{The inner tracking detector}

covers the pseudorapidity region |η| < 2.5 and consists of a silicon pixel detector, a silicon microstrip detector, and a transition radiation tracker. The inner tracking detec-tor is surrounded by a thin superconducting solenoid that provides a 2 T magnetic field and by a finely-segmented calorimeter with nearly full solid-angle coverage. The latter covers the pseudorapidity range |η| < 4.9

1

ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the centre of the detector and the z-axis along the beam pipe. The x-axis points from the IP to the centre of the LHC ring, and the y-axis points upward. Cylindrical coordinates (r, φ) are used in the transverse (x,y) plane, φ being the az-imuthal angle around the beam pipe. The pseudo-rapidity is defined in terms of the polar angle θ as η = − ln tan(θ/2).

and provides three-dimensional reconstruc-tion of particle showers. The electromag-netic compartment uses lead absorbers with liquid-argon as the active material. This is followed by a hadronic compartment, which uses scintillating tiles with iron absorbers in the central region and liquid-argon sam-pling with copper or tungsten absorbers

for |η| > 1.7. The muon

spectrom-eter surrounds the calorimspectrom-eters and con-sists of three large superconducting toroids (each with eight coils), a system of precision tracking chambers (|η| < 2.7), and detectors for triggering.

3. Data and event selection

The data used in this analysis were recorded in 2011 at a centre-of-mass energy of 7 TeV. Only data with stable run con-ditions and operational tracking, calorime-try, and muon subdetectors are used. This results in a data sample with an integrated

luminosity of 4.6 fb−1 _{with an estimated}

un-certainty of 3.9% [7]. Events are required to satisfy a single-electron trigger for the eµ

and eτhad searches and a single-muon

trig-ger for the µτhad search. The nominal

trans-verse momentum (pT) threshold for the

elec-tron trigger was 20 or 22 GeV, depending on the instantaneous luminosity, and was 18 GeV for the muon trigger.

An electron candidate is required to have

pT > 25 GeV and to lie in the

pseu-dorapidity region |η| < 2.47, excluding the transition region (1.37 < |η| < 1.52) between the barrel and endcap

calorime-ters. The pT of the electron is calculated

from the calorimeter energy and the

direc-tion of the inner detector track. A set

of electron identification criteria based on the calorimeter shower shape, track qual-ity, transition radiation, and track

match-ing with the calorimeter energy deposition, referred to as ‘tight’ [8], is applied. Two lepton isolation criteria are used to reduce backgrounds from hadronic jets. The calori-metric isolation criterion requires that the transverse energy deposited within a cone

of radius ∆R = p(∆η)2_{+ ∆(φ)}2 _{= 0.3}

around the electron cluster, excluding the core energy deposited by the electron, is

less than 0.14 times the pT of the candidate.

The tracking isolation criterion requires the sum of the transverse momenta of tracks

with pT > 1 GeV within a cone of radius

∆R < 0.3 around the electron track, ex-cluding the electron track, is less than 0.13

times the pT of the candidate.

A muon candidate must have recon-structed tracks in both the inner detector

and the muon spectrometer. The muon

track parameters are a statistical combi-nation of those for the inner detector and muon spectrometer tracks. The inner de-tector track is required to have a pattern of hits consistent with a quality track. Fur-thermore, the muon candidate must have

pT > 25 GeV and be isolated, using similar

criteria as for electrons: 0.14 times pT for

calorimetric isolation and 0.15 times pT for

tracking isolation.

Jets are reconstructed using the anti-kt

jet clustering algorithm [9] with a radius

pa-rameter of 0.4. Only jets with pT > 20 GeV

and |η| < 2.5 are considered. Leptons are retained only if they are separated from all jets by ∆R > 0.4.

Tau leptons are reconstructed through their hadronic decays. The tau

reconstruc-tion is seeded by anti-kt jets [9] with cone

size ∆R = 0.4 and jet pT > 10 GeV.

Cor-rections depending on pT and η are

ap-plied to the tau energy. A boosted deci-sion tree discriminator [10] efficiently selects taus while rejecting backgrounds. The

vari-ables used in the discriminator are ∆R be-tween the tracks and the tau candidate, the impact parameter significance of the tracks,

the fraction of the pT of the tau candidate

carried by the tracks, the number of tracks in an isolation annulus of 0.2 < ∆R < 0.4, the width of the energy deposition in the calorimeter, energy isolation for cones of ∆R = 0.1 and ∆R = 0.4, and the invariant mass associated with the energy deposition. For this analysis, ‘medium’ selection criteria as described in reference [10] are used. This selection is about 60% efficient at retaining taus that decay hadronically, as measured in Z → ττ decays, while accepting 1 of 20 to 1 of 50 ordinary hadronic jets misidenti-fied as tau candidates. The reconstruction efficiency for hadronic tau decays with three tracks drops significantly at large transverse momentum as the tracks become more col-limated. This analysis therefore uses only tau candidates with one track, which com-prise 85% of tau decays. Tau candidates

must have ET > 20 GeV and

pseudorapid-ity in the range 0.03 < |η| < 2.5. The lower limit excludes a region where there is reduced coverage from the inner detector and calorimeters, which greatly increases misidentification of electrons as hadronic tau decays. To retain only taus that

de-cay hadronically (τhad), candidates

consis-tent with being an electron or a muon are rejected.

The missing transverse energy (Emiss

T ) is

calculated from the vector sum of the

trans-verse momenta of all high-pT objects

(elec-trons, muons, photons, taus, and jets) and all calorimeter energy clusters with |η| < 4.5 not associated with those objects [11].

Events are required to have exactly two lepton candidates with opposite sign and different flavour, that is, eµ, eτhad, or µτhad.

one primary vertex with at least four tracks

with pT > 400 MeV. The two leptons are

chosen to be back-to-back in φ by requiring that the azimuthal angle between them sat-isfies ∆φℓℓ′ > 2.7. Finally, for the eτ_had and

µτhad events, the pT of the electron or muon

is required to be greater than the ET of the

tau.

For eτhad and µτhad signal events, the

presence of only one tau and the require-ment of large morequire-mentum relative to the tau mass implies that the neutrino from the tau decay should point in nearly the same direction as the tau momentum and that there are no other significant sources of Emiss

T . The transverse components of the

neutrino momentum are set equal to the

components of the Emiss

T vector and the

po-lar angle of the neutrino momentum is set equal to the polar angle of the tau candi-date’s momentum. The momentum of the tau candidate is corrected for the momen-tum of the neutrino in the calculation of the

eτhad and µτhad invariant mass. This

signif-icantly reduces the width of the invariant

mass distribution for eτhad and µτhad pairs

and improves the search sensitivity, while making no significant changes to the back-ground shapes. For dilepton masses from 400 GeV to 2000 GeV, the mass resolutions range from 2.5% to 7.5%, 2.2% to 4.3%, and

6.3% to 9.0% for the eµ, eτhad, and µτhad

decay modes, respectively. The mass reso-lutions are dominated by the resolution of the transverse momenta of the leptons. At

high pT, the transverse momentum

resolu-tion is best for electrons, whose pT

measure-ment is based primarily on energy deposited

in the electromagnetic calorimeter. It is

next best for taus, whose pT measurement

is based on electromagnetic and hadronic

calorimeter energy depositions. It is the

worst for muons, whose pT measurement is

from tracking. The ET of the tau used in

the selection requirements above is not cor-rected for the neutrino momentum.

4. Backgrounds

The SM processes that can produce an

ℓℓ′ _{signature are divided into two}

cate-gories: backgrounds that produce direct lepton pairs (referred to as direct-lepton backgrounds) and jet backgrounds where one or both of the candidate leptons is from

a misidentified jet. Data events with an ℓℓ′

invariant mass below 200 GeV constitute a control region to verify the background estimates, and events with masses above 200 GeV comprise the signal search region. The dominant direct-lepton backgrounds

are t¯t, Z/γ∗

→ ℓℓ, diboson (W W , ZZ, and W Z), and single top quark (W t). Since these processes are well understood and modelled, their contributions are esti-mated using Monte Carlo samples

gener-ated at √s = 7 TeV and processed with

the full ATLAS geant4 [12] simulation and reconstruction. The event generators

used are pythia 6.421 [13] (W and Z/γ∗_),

powheg _{1.0 [14] (t¯t), madgraph 4 [15]}

(W/Z + γ), mc@nlo 3.4 [16] (single top quark) and herwig 6.510 [17] (W W , W Z

and ZZ). The parton distribution

func-tions are CTEQ6L1 [18] for W and Z pro-duction and CT10 [19] for t¯t, single-top quark, and diboson production. The Monte Carlo samples are normalized to cross sec-tions with higher-order correcsec-tions applied. The cross section is calculated to

next-to-next-to-leading order for W and Z/γ∗ _[20],

next-to-leading order plus next-to-next-to-leading log for t¯t [21], and next-to-next-to-next-to-leading order for W W , W Z and ZZ [22]. Single-top quark and W/Z + γ cross sections are calculated with mc@nlo and madgraph,

respectively. The effects of QED radiation are generated with photos [23]. Hadronic tau decays are simulated with tauola [24].

Studies of leptons in Z/γ∗_{, W , and J/ψ}

events [25] have shown that the lepton re-construction and identification efficiencies, energy scale, and energy resolution need small adjustment in the Monte Carlo sim-ulation to describe the data properly. The appropriate corrections are applied to the Monte Carlo samples to improve the mod-elling of the backgrounds. The effect of ad-ditional pp interactions per bunch crossing as a function of the instantaneous luminos-ity is modelled by overlaying simulated min-imum bias events with the same distribution in number of events per bunch crossing as observed in the data.

The processes W/Z + γ, W/Z+jets, and multijet production give rise to backgrounds from jets misidentified as leptons, electrons from photon conversions, and leptons from hadron decays (including b- and c-hadron decays). The dominant component of these backgrounds is from events with one prompt lepton and one jet misidentified as a lep-ton, with an additional contribution from events with two misidentified jets. These backgrounds are estimated using data. The background component initiated by prompt photons is estimated from Monte Carlo samples.

The jet backgrounds, including semilep-tonic decays in bottom and charm jets, are greatly reduced by the lepton isolation and

high-pT requirements but are still

signifi-cant. The dominant jet background is due to W +jets production, whose contribution is estimated using data from a subsample selected with the same criteria as signal events but with the additional requirement Emiss

T > 30 GeV. This subsample is enriched

in W +jets events, whose contribution is

about 60%, while the multijet background is reduced to about 3% and the direct-lepton background to about 37%. The potential ef-fect of the multijet contribution is included in the systematic uncertainty. The contri-bution from direct-lepton backgrounds in the subsample is determined from Monte Carlo simulation and is subtracted to give the number of W +jets events. This num-ber is extrapolated to the numnum-ber in the full

data sample without the Emiss

T criterion

us-ing the W +jets Monte Carlo samples. The shapes of the W +jets background in

vari-ous kinematic variables, including mℓℓ′, are

taken from W +jets Monte Carlo samples. Studies of event samples dominated by multijet events show that the probability that a jet is misidentified as a lepton is inde-pendent of its charge [26], with a 10% un-certainty. A same-sign sample is selected using the same criteria as for the signal sam-ple but with the sign requirement reversed. The multijet background in the opposite-sign sample is taken to be equal to its con-tribution in the same-sign sample. Direct-lepton backgrounds produce more opposite-sign than opposite-sign events, so the same-sign sample is enriched in multijet

back-ground. Contributions to the same-sign

sample by the direct-lepton backgrounds are determined from Monte Carlo

simula-tion. The W +jets contamination of the

same-sign sample is determined by selecting

only same-sign events with Emiss

T > 30 GeV

and then extrapolating to the full same-sign sample using Monte Carlo simulation. The direct-lepton background and W +jets con-tributions are subtracted from the observed same-sign sample to give the expected dis-tribution and normalisation of the multijet background in the opposite-sign sample.

Table 1 shows the number of events se-lected in data and the estimated

back-ground contributions with their uncertain-ties. The largest backgrounds in the signal

region (mℓℓ′ > 200 GeV) are W +jets events,

arising primarily from the leptonic decay of the W and the misidentification of a jet as a lepton, and t¯t events, arising primarily from semileptonic decays of both the t and ¯t. For

the eτhad mode, there is a significant

contri-bution from multijet events where two jets are misidentified as leptons. There is also a significant contribution to the eµ mode from W W diboson production where one W de-cays to an electron and the other to a muon. Blank entries indicate an insignificant con-tribution to the background. The dominant sources of systematic uncertainty for the background predictions arise from the sta-tistical uncertainty on the W +jets and mul-tijet background determinations from data, a 10% uncertainty on extrapolation from the subsample to the full sample in the cal-culation of the W +jets backgrounds, theo-retical uncertainties on the cross sections of the direct-lepton background processes (5% to 10%), and the integrated luminosity un-certainty (3.9%). Other systematic uncer-tainties from the lepton trigger (1%), the product of reconstruction and identification efficiencies (1%, 2%, and 5% for e, µ, and τ , respectively), and the energy/momentum scale and resolution (1%, 1%, and 3% for e, µ, and τ , respectively) are small and have been included. There are small correlations between the background estimates (for ex-ample, from the luminosity), which are in-cluded when setting limits.

The expected number of events in the control region agrees well with the observed number of events for all three signatures (eµ, eτhad, and µτhad).

5. Signal simulation

The production of an RPV ˜ντ followed by

a lepton-flavour-violating decay into eµ, eτ , or µτ is considered in the interpretation of

the data. The ˜ντ may be produced by

ei-ther d ¯d or s¯s but not u¯u annihilation. This

search is performed assuming exclusively d ¯d

production, since s¯s production is expected

to be a factor of 10 to 60 lower than d ¯d

pro-duction for the same couplings for sneutrino masses from 500 GeV to 2000 GeV.

In RPV SUSY, the LFV terms of the effective Lagrangian are given by L =

1

2λijkLiLjek + λ ′

ijkLiQjdk, where L and Q

are the lepton and quark SU(2) supermulti-plets, e and d are the lepton and down-like quark singlet supermultiplets, and i, j, k = 1, 2, 3 refer to fermion generation number.

The theory requires λijk = −λjik. The λ′

terms include coupling of downlike quark-antiquark pairs to sneutrinos, and the λ terms include couplings of the sneutrino to distinct charged leptons. For the interpre-tation of this measurement, the sneutrino is produced by d ¯d annihilation to ˜ντ with

cou-pling λ′

311 and decays to ℓℓ′ with couplings

λ132, λ133, and λ233 for eµ, eτ , and µτ ,

re-spectively.

The signal cross sections are calculated to next-to-leading order [1] using CTEQ6L1 parton distribution functions [18] and de-pend on the ˜ντ mass (m˜ντ), λ

′

311 and λi3k,

where i 6= k are the final-state lepton gen-erations. The sneutrino is assumed to be a narrow resonance, and the measurement here is sensitive to the production coupling λ′

311 and the branching ratio ˜ντ → ℓℓ′.

Monte Carlo events with ˜ντ decaying into

eµ, eτ , and µτ are generated with herwig

6.520 _{[17, 27] with sneutrino masses}

rang-ing from 500 GeV to 2000 GeV.

experi-Table 1: Estimated SM backgrounds and observed event yield for each signal category for the background

(mℓℓ′ < 200 GeV) and signal (mℓℓ′ > 200 GeV) regions.

mℓℓ′ < 200 GeV m_ℓℓ′ > 200 GeV

Process Neµ Neτhad Nµτhad Neµ Neτhad Nµτhad

Z/γ∗ _{→ ττ 1880 ± 150 4300 ± 600 5300 ± 600 8 ± 1 24 ± 3 28 ± 4} Z/γ∗ → ee 1050 ± 80 44 ± 3 Z/γ∗ _{→ µµ 3030 ± 290 29 ± 3} t¯t _{760 ± 110 96 ± 18 94 ± 14 251 ± 30 90 ± 15 70 ± 13} Diboson _{260 ± 27 57 ± 8 60 ± 7 71 ± 8 26 ± 3 24 ± 3}

Single top quark _{87 ± 8 11 ± 2 9 ± 1 39 ± 4 10 ± 2 8 ± 1}

W +jets _{420 ± 260 3500 ± 700 3200 ± 600 90 ± 40 370 ± 80 470 ± 110}

multijet _{37 ± 13 2200 ± 700 730 ± 230 6 ± 2 150 ± 50 24 ± 18}

Total

background _{3440 ± 300 11200 ± 900 12400 ± 800 460 ± 60 720 ± 80 650 ± 90}

Data 3345 11212 12285 498 795 699

ments [5], the best limit on λ′

311 is

0.012 × (m_d˜/100 GeV) = 0.12 for the

current lower limit on md˜. The limit on

λi3k is 0.05 × (m˜ek/100 GeV), where ˜ek is

the kth _{generation slepton. Couplings of}

λ′

311 = 0.11, λi3k = 0.07 and λ′311 = 0.10,

λi3k = 0.05 are used as benchmarks in this

letter. These are consistent with current limits and benchmarks used in previous

searches [3, 4]. For these couplings, the

expected width of the sneutrino is approx-imately 0.1% of its mass. For the range of couplings considered in this letter, the width is always less than 5% of the mass. If the couplings are significantly larger than our benchmarks, the use of perturbation theory is not valid.

6. Results

The ℓℓ′ _{invariant mass distributions in the}

signal region are presented in figure 1 for data, SM background contributions, and a ˜

ντ with m˜ντ = 500 GeV and with couplings

λ′

311 = 0.11 and λi3k = 0.07.

The invariant mass spectra are examined for the presence of an RPV sneutrino. No significant excess above the SM expectation is observed, and limits are placed on the production cross section times branching ra-tio. For each sneutrino mass, the search re-gion is defined to be within ±3 standard deviations of the sneutrino mass, except for

m˜ντ above 800 GeV, where all events with

mℓℓ′ > 800 GeV are used. The

probabil-ity of observing a number of events as a function of the cross section times branch-ing ratio, efficiency, luminosity, and back-ground expectation is constructed from a Poisson distribution. The systematic un-certainties are included by convolution with Gaussian distributions. The expected and observed 95% confidence level (CL) upper

limits on σ(pp → ˜ντ) × BR(˜ντ → ℓℓ′)

are calculated as a function of mν˜τ using

a Bayesian method [28] with a flat prior for the signal cross section times branch-ing ratio and integratbranch-ing over the nuisance parameters. Figure 2 shows the expected

2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 4 10 2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 4 10 ATLAS µ e -1 Ldt = 4.6 fb ∫ = 7 TeV s Data τ τ → Z t t W+jet WW Multijet Single Top (500GeV) τ ν∼ [GeV] µ e m 2 10 ₁₀3 Data/SM 0.5 1 1.5 2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 ATLAS had τ e -1 Ldt = 4.6 fb ∫ = 7 TeV s Data Multijet W+jet τ τ → Z ee → Z WW t t Single Top (500GeV) τ ν∼ [GeV] τ e m 2 10 103 Data/SM 0.5 1 1.5 2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 2 3 Events / 10 GeV -1 10 1 10 2 10 3 10 ATLAS -1 Ldt = 4.6 fb ∫ = 7 TeV s had τ µ Data W+jet τ τ → Z µ µ → Z Multijet t t WW Single Top (500GeV) τ ν∼ [GeV] τ µ m 2 10 ₁₀3 Data/SM 0.5 1 1.5

Figure 1: Observed and predicted ℓℓ′ _invariant

mass distributions for eµ (top), eτhad(middle), and

µτhad (bottom). Signal simulations are shown for

mν˜τ = 500 GeV (λ

′

311 = 0.11, λi3k = 0.07). The

region with mℓℓ′ < 200 GeV is used to verify the

background estimation. The lower plot for each de-cay mode shows the ratio of the data to the SM backgrounds. The red hatching represents the un-certainty on the total background in all plots.

and observed limits as a function of mν˜τ,

together with the ±1 and ±2 standard de-viation uncertainty bands. The expected exclusion limits are determined using sim-ulated pseudo-experiments containing only SM processes by evaluating the 95% CL upper limits for each pseudo-experiment at

each value of mν˜τ, including systematic

un-certainties. The expected limit is

calcu-lated as the median of the distribution of limits. The ensemble of limits is also used to find the 1σ and 2σ envelopes of the

ex-pected limits as a function of mν˜τ. For a

sneutrino mass of 500 (2000) GeV, the ob-served limits on the production cross sec-tion times branching ratio are 3.2 (1.4) fb, 42 (17) fb, and 40 (18) fb for the eµ, eτ , and µτ modes, respectively. The eτ and µτ limits are weaker because (1) the 1-track tau hadronic branching ratio is about 50%, (2) the tau reconstruction efficiency is lower due to criteria needed to reduce jet back-grounds, and (3) the jet backgrounds are significantly larger than for the eµ mode.

In order to extract mass and coupling lim-its, it is assumed that only d ¯d and ℓℓ′_couple

to the sneutrino. The theoretical cross

sec-tions times branching ratios for λ′

311= 0.11,

λi3k = 0.07 and λ′311 = 0.10, λi3k = 0.05 are

also shown in figure 2. The branching ratio

for each ℓℓ′ _{mode depends on the couplings}

and is 21% for λ′

311 = 0.11, λi3k = 0.07 and

14% for λ′

311 = 0.10, λi3k = 0.05. The

uncertainties on the theoretical cross sec-tions are evaluated by varying the factorisa-tion and renormalisafactorisa-tion scales (set equal to each other) from mν˜τ/2 to 2mν˜τ and

vary-ing the parton distribution functions. These uncertainties are indicated as bands in fig-ure 2 and are small (only slightly larger than the width of the central line). For couplings λ′

311= 0.10, λi3k = 0.05, the lower limits on

1100 GeV for eµ, eτ , and µτ , respectively. These lower limits are a factor of two to three higher than the best limits from the Tevatron for the same couplings [3].

The limits on the cross section times branching ratio are converted to limits on the couplings under the assumption that there are no other significant couplings that

contribute to the decay of the ˜ντ. In

this case, the dependence of the cross sec-tion times branching ratio on the couplings is |λ′

311|2|λi3k|2/(Nc|λ′311|2+ 2|λi3k|2), where

the |λ′

311|2 in the numerator is from the

pro-duction and the rest is from the branching

ratio. The factor Nc = 3 is from color, and

the 2 in the denominator comes from

ac-cepting both charge states, that is, ℓ+_ℓ′−

and ℓ−_ℓ′+_{. Figure 3 shows contours of the}

limit on λ′

311 as a function of the sneutrino

mass for various values of λi3k. For each

curve, the area above the curve is excluded. The previous limit from ATLAS for the eµ

mode, based on 1 fb−1 _{of 7 TeV data [4], is}

also shown. 7. Summary

A search has been performed for a heavy particle decaying to eµ, eτhad, or µτhad final

states using 4.6 fb−1 _{of pp collision data at}

√

s = 7 TeV recorded by the ATLAS detec-tor at the LHC. The data are found to be consistent with SM predictions. Limits are placed on the cross section times branching ratio for an RPV SUSY sneutrino. These results considerably extend previous con-straints from ATLAS [4] and the Tevatron experiments [3].

8. Acknowledgements

We thank CERN for the very successful operation of the LHC, as well as the support

[GeV] τ ν∼ m 500 1000 1500 2000 [fb] BR × σ 95% CL -1 10 1 10 2 10 3 10 4 10 5 10 = 0.07 132 λ = 0.11, 311 ’ λ Theory = 0.05 132 λ = 0.10, 311 ’ λ Theory Observed Limit Expected Limit σ 1 ± Expected Limit σ 2 ± Expected Limit -1 Ldt = 4.6 fb

∫

= 7 TeV s ATLAS µ e [GeV] τ ν∼ m 500 1000 1500 2000 Limit [fb] BR × σ 95% CL 1 10 2 10 3 10 4 10 5 10 = 0.07 133 λ = 0.11, 311 ’ λ Theory = 0.05 133 λ = 0.10, 311 ’ λ Theory Observed Limit Expected Limit σ 1 ± Expected Limit σ 2 ± Expected Limit τ e -1 Ldt = 4.6 fb

∫

= 7 TeV s ATLAS [GeV] τ ν∼ m 500 1000 1500 2000 Limit [fb] BR × σ 95% CL 1 10 2 10 3 10 4 10 5 10 = 0.07 233 λ = 0.11, 311 ’ λ Theory = 0.05 233 λ = 0.10, 311 ’ λ Theory Observed Limit Expected Limit σ 1 ± Expected Limit σ 2 ± Expected Limit τ µ -1 Ldt = 4.6 fb

∫

= 7 TeV s ATLAS

Figure 2: The 95% CL upper limit on the produc-tion cross secproduc-tion times branching ratio as a func-tion of sneutrino mass for eµ (top), eτ (middle), and µτ (bottom) modes. The red dotted curve is the ex-pected limit, the black solid curve is the observed limit, and the yellow and green bands give ±1 and ±2 standard deviations in the expected limit.

The expected theoretical curves for λ′311 = 0.11,

λi3k = 0.07 (light blue dot–dash) and λ

′

311= 0.10,

λi3k = 0.05 (light magenta dashed) are also plotted

[GeV] τ ν∼ m 500 1000 1500 2000 311 ’ λ -3 10 -2 10 -1 10 = 0.07 132 λ = 0.05 132 λ = 0.01 132 λ 7 TeV) -1 = 0.07(1 fb 132 λ ATLAS = 7 TeV s -1 L dt = 4.6 fb

∫

e µ [GeV] τ ν∼ m 500 1000 1500 311 ’ λ -2 10 -1 10 = 0.07 133 λ = 0.05 133 λ ATLAS = 7 TeV s -1 L dt = 4.6 fb

∫

τ e [GeV] τ ν∼ m 500 1000 1500 311 ’ λ -2 10 -1 10 = 0.07 233 λ = 0.05 233 λ ATLAS = 7 TeV s -1 L dt = 4.6 fb

∫

τ µ

Figure 3: The 95% CL limits on λ′

311as a function

of sneutrino mass for assumed values of λi3k for the

eµ (top), eτ (middle), and µτ (bottom) modes. For the eµ mode, the black solid curve is the previous

ATLAS result based on 1 fb−1 _{of data at 7 TeV.}

staff from our institutions without whom ATLAS could not be operated efficiently.

We acknowledge the support of

AN-PCyT, Argentina; YerPhI, Armenia;

ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS,

Colombia; MSMT CR, MPO CR and

VSC CR, Czech Republic; DNRF, DNSRC

and Lundbeck Foundation, Denmark;

ARTEMIS, European Union;

IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, 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, Swe-den; 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 AT-LAS Tier-1 facilities 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.

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G. De Zorzi132a,132b_{, W.J. Dearnaley}71_{, R. Debbe}25_{, C. Debenedetti}46_{, B. Dechenaux}55_,

D.V. Dedovich64_{, J. Degenhardt}120_{, 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,k_,

D. della Volpe102a,102b_{, M. Delmastro}5_{, P.A. Delsart}55_{, C. Deluca}105_{, S. Demers}176_,

M. Demichev64_{, B. Demirkoz}12,m_{, S.P. Denisov}128_{, D. Derendarz}39_{, J.E. Derkaoui}135d_,

F. Derue78_{, P. Dervan}73_{, K. Desch}21_{, E. Devetak}148_{, P.O. Deviveiros}105_{, A. Dewhurst}129_,

B. DeWilde148_{, S. Dhaliwal}158_{, R. Dhullipudi}25,n_{, A. Di Ciaccio}133a,133b_{, L. Di Ciaccio}5_,

C. Di Donato102a,102b_{, A. Di Girolamo}30_{, B. Di Girolamo}30_{, S. Di Luise}134a,134b_,

A. Di Mattia152_{, B. Di Micco}30_{, R. Di Nardo}47_{, A. Di Simone}133a,133b_{, R. Di Sipio}20a,20b_,

M.A. Diaz32a_{, E.B. Diehl}87_{, J. Dietrich}42_{, T.A. Dietzsch}58a_{, S. Diglio}86_{, K. Dindar Yagci}40_,

J. Dingfelder21_{, F. Dinut}26a_{, C. Dionisi}132a,132b_{, P. Dita}26a_{, S. Dita}26a_{, F. Dittus}30_,

F. Djama83_{, T. Djobava}51b_{, M.A.B. do Vale}24c_{, A. Do Valle Wemans}124a ,o_{, T.K.O. Doan}5_,

M. Dobbs85, D. Dobos30, E. Dobson30,p, J. Dodd35, C. Doglioni49, T. Doherty53, Y. Doi65,∗, J. Dolejsi127_{, Z. Dolezal}127_{, B.A. Dolgoshein}96,∗_{, T. Dohmae}155_{, M. Donadelli}24d_,

J. Donini34_{, J. Dopke}30_{, A. Doria}102a_{, A. Dos Anjos}173_{, A. Dotti}122a,122b_{, M.T. Dova}70_,

A.D. Doxiadis105_{, A.T. Doyle}53_{, N. Dressnandt}120_{, M. Dris}10_{, J. Dubbert}99_{, S. Dube}15_,

E. Dubreuil34_{, E. Duchovni}172_{, G. Duckeck}98_{, D. Duda}175_{, A. Dudarev}30_{, F. Dudziak}63_,

M. D¨uhrssen30_{, I.P. Duerdoth}82_{, L. Duflot}115_{, M-A. Dufour}85_{, L. Duguid}76_{, M. Dunford}58a_,

H. Duran Yildiz4a_{, R. Duxfield}139_{, M. Dwuznik}38_{, M. D¨uren}52_{, W.L. Ebenstein}45_,

J. Ebke98_{, S. Eckweiler}81_{, W. Edson}2_{, C.A. Edwards}76_{, N.C. Edwards}53_{, W. Ehrenfeld}21_,

T. Eifert143_{, G. Eigen}14_{, K. Einsweiler}15_{, E. Eisenhandler}75_{, T. Ekelof}166_{, M. El Kacimi}135c_,

M. Ellert166_{, 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}176_{, A. Ereditato}17_,

D. Eriksson146a_{, J. Ernst}2_{, M. Ernst}25_{, J. Ernwein}136_{, D. Errede}165_{, S. Errede}165_{, E. Ertel}81_,

M. Escalier115_{, H. Esch}43_{, C. Escobar}123_{, X. Espinal Curull}12_{, B. Esposito}47_{, F. Etienne}83_,

A.I. Etienvre136_{, E. Etzion}153_{, D. Evangelakou}54_{, H. Evans}60_{, L. Fabbri}20a,20b_{, C. Fabre}30_,

R.M. Fakhrutdinov128_{, S. Falciano}132a_{, Y. Fang}33a_{, M. Fanti}89a,89b_{, A. Farbin}8_,

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

F. Fassi167_{, P. Fassnacht}30_{, D. Fassouliotis}9_{, B. Fatholahzadeh}158_{, A. Favareto}89a,89b_,

L. Fayard115_{, P. Federic}144a_{, O.L. Fedin}121_{, W. Fedorko}168_{, M. Fehling-Kaschek}48_,

L. Feligioni83_{, C. Feng}33d_{, E.J. Feng}6_{, A.B. Fenyuk}128_{, J. Ferencei}144b_{, W. Fernando}6_,

S. Ferrag53_{, J. Ferrando}53_{, V. Ferrara}42_{, A. Ferrari}166_{, P. Ferrari}105_{, R. Ferrari}119a_,

D.E. Ferreira de Lima53_{, A. Ferrer}167_{, D. Ferrere}49_{, C. Ferretti}87_{, A. Ferretto Parodi}50a,50b_,

M. Fiascaris31_{, F. Fiedler}81_{, A. Filipˇciˇc}74_{, F. Filthaut}104_{, M. Fincke-Keeler}169_,

M.C.N. Fiolhais124a,i, L. Fiorini167, A. Firan40, G. Fischer42, M.J. Fisher109, E.A. Fitzgerald23_{, M. Flechl}48_{, I. Fleck}141_{, J. Fleckner}81_{, P. Fleischmann}174_,

S. Fleischmann175_{, G. Fletcher}75_{, T. Flick}175_{, A. Floderus}79_{, L.R. Flores Castillo}173_,

A.C. Florez Bustos159b_{, M.J. Flowerdew}99_{, T. Fonseca Martin}17_{, A. Formica}136_{, A. Forti}82_,

D. Fortin159a_{, D. Fournier}115_{, A.J. Fowler}45_{, H. Fox}71_{, P. Francavilla}12_{, M. Franchini}20a,20b_,

S. Franchino119a,119b_{, D. Francis}30_{, T. Frank}172_{, M. Franklin}57_{, S. Franz}30_,

M. Fraternali119a,119b_{, S. Fratina}120_{, S.T. French}28_{, C. Friedrich}42_{, F. Friedrich}44_,

D. Froidevaux30_{, J.A. Frost}28_{, C. Fukunaga}156_{, E. Fullana Torregrosa}127_{, B.G. Fulsom}143_,

J. Fuster167_{, C. Gabaldon}30_{, O. Gabizon}172_{, S. Gadatsch}105_{, T. Gadfort}25_{, S. Gadomski}49_,

G. Gagliardi50a,50b_{, P. Gagnon}60_{, C. Galea}98_{, B. Galhardo}124a_{, E.J. Gallas}118_{, V. Gallo}17_,

B.J. Gallop129_{, P. Gallus}126_{, K.K. Gan}109_{, Y.S. Gao}143,g_{, A. Gaponenko}15_{, F. Garberson}176_,

M. Garcia-Sciveres15_{, C. Garc´ıa}167_{, J.E. Garc´ıa Navarro}167_{, R.W. Gardner}31_{, N. Garelli}143_,

V. Garonne30_{, C. Gatti}47_{, G. Gaudio}119a_{, B. Gaur}141_{, L. Gauthier}136_{, P. Gauzzi}132a,132b_,

I.L. Gavrilenko94_{, 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. Gemmell53_{, M.H. Genest}55_{, S. Gentile}132a,132b_{, M. George}54_{, S. George}76_{, D. Gerbaudo}12_,

P. Gerlach175_{, A. Gershon}153_{, C. Geweniger}58a_{, H. Ghazlane}135b_{, N. Ghodbane}34_,

B. Giacobbe20a_{, S. Giagu}132a,132b_{, V. Giangiobbe}12_{, F. Gianotti}30_{, B. Gibbard}25_,

A. Gibson158_{, S.M. Gibson}30_{, M. Gilchriese}15_{, T.P.S. Gillam}28_{, D. Gillberg}30_,

A.R. Gillman129_{, D.M. Gingrich}3,f_{, J. Ginzburg}153_{, N. Giokaris}9_{, M.P. Giordani}164c_,

R. Giordano102a,102b_{, F.M. Giorgi}16_{, P. Giovannini}99_{, P.F. Giraud}136_{, D. Giugni}89a_,

M. Giunta93, B.K. Gjelsten117, L.K. Gladilin97, C. Glasman80, J. Glatzer21, A. Glazov42, G.L. Glonti64_{, J.R. Goddard}75_{, J. Godfrey}142_{, J. Godlewski}30_{, M. Goebel}42_{, T. G¨opfert}44_,

C. Goeringer81_{, C. G¨ossling}43_{, S. Goldfarb}87_{, T. Golling}176_{, D. Golubkov}128_{, A. Gomes}124a,c_,

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-Sevilla49_{, J.J. Goodson}148_{, L. Goossens}30_{, P.A. Gorbounov}95_{, H.A. Gordon}25_,

I. Gorelov103_{, G. Gorfine}175_{, B. Gorini}30_{, E. Gorini}72a,72b_{, A. Goriˇsek}74_{, E. Gornicki}39_,

A.T. Goshaw6_{, 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-Bold38_{, P. Grafstr¨om}20a,20b_{, K-J. Grahn}42_{, E. Gramstad}117_,

F. Grancagnolo72a_{, S. Grancagnolo}16_{, V. Grassi}148_{, V. Gratchev}121_{, H.M. Gray}30_,

J.A. Gray148_{, E. Graziani}134a_{, O.G. Grebenyuk}121_{, T. Greenshaw}73_{, Z.D. Greenwood}25,n_,

K. Gregersen36_{, I.M. Gregor}42_{, P. Grenier}143_{, J. Griffiths}8_{, N. Grigalashvili}64_,

A.A. Grillo137_{, K. Grimm}71_{, S. Grinstein}12_{, Ph. Gris}34_{, Y.V. Grishkevich}97_{, J.-F. Grivaz}115_,

A. Grohsjean42_{, E. Gross}172_{, J. Grosse-Knetter}54_{, J. Groth-Jensen}172_{, K. Grybel}141_,

D. Guest176_{, C. Guicheney}34_{, E. Guido}50a,50b_{, T. Guillemin}115_{, S. Guindon}54_{, U. Gul}53_,

J. Gunther125_{, B. Guo}158_{, J. Guo}35_{, P. Gutierrez}111_{, N. Guttman}153_{, O. Gutzwiller}173_,

C. Guyot136_{, C. Gwenlan}118_{, C.B. Gwilliam}73_{, A. Haas}108_{, S. Haas}30_{, C. Haber}15_,

H.K. Hadavand8_{, D.R. Hadley}18_{, P. Haefner}21_{, F. Hahn}30_{, Z. Hajduk}39_{, H. Hakobyan}177_,

D. Hall118_{, G. Halladjian}62_{, K. Hamacher}175_{, P. Hamal}113_{, K. Hamano}86_{, M. Hamer}54_,

A. Hamilton145b,q_{, S. Hamilton}161_{, L. Han}33b_{, K. Hanagaki}116_{, K. Hanawa}160_{, M. Hance}15_,

C. Handel81_{, P. Hanke}58a_{, J.R. Hansen}36_{, J.B. Hansen}36_{, J.D. Hansen}36_{, P.H. Hansen}36_,

P. Hansson143, K. Hara160, T. Harenberg175, S. Harkusha90, D. Harper87, R.D. Harrington46,

O.M. Harris138_{, J. Hartert}48_{, F. Hartjes}105_{, T. Haruyama}65_{, A. Harvey}56_{, S. Hasegawa}101_,

Y. Hasegawa140_{, S. Hassani}136_{, S. Haug}17_{, M. Hauschild}30_{, R. Hauser}88_{, M. Havranek}21_,

C.M. Hawkes18_{, R.J. Hawkings}30_{, A.D. Hawkins}79_{, T. Hayakawa}66_{, T. Hayashi}160_,

D. Hayden76_{, C.P. Hays}118_{, H.S. Hayward}73_{, S.J. Haywood}129_{, S.J. Head}18_{, V. Hedberg}79_,

L. Heelan8_{, S. Heim}120_{, B. Heinemann}15_{, S. Heisterkamp}36_{, L. Helary}22_{, C. Heller}98_,

M. Heller30_{, S. Hellman}146a,146b_{, D. Hellmich}21_{, C. Helsens}12_{, R.C.W. Henderson}71_,

M. Henke58a_{, A. Henrichs}176_{, A.M. Henriques Correia}30_{, S. Henrot-Versille}115_{, C. Hensel}54_,

C.M. Hernandez8_{, 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_{, R. Hickling}75_,

E. Hig´on-Rodriguez167_{, J.C. Hill}28_{, K.H. Hiller}42_{, S. Hillert}21_{, S.J. Hillier}18_{, I. Hinchliffe}15_,

E. Hines120_{, M. Hirose}116_{, F. Hirsch}43_{, D. Hirschbuehl}175_{, J. Hobbs}148_{, N. Hod}153_,

M.C. Hodgkinson139_{, P. Hodgson}139_{, A. Hoecker}30_{, M.R. Hoeferkamp}103_{, J. Hoffman}40_,

D. Hoffmann83_{, M. Hohlfeld}81_{, M. Holder}141_{, S.O. Holmgren}146a_{, T. Holy}126_,

J.L. Holzbauer88_{, T.M. Hong}120_{, L. Hooft van Huysduynen}108_{, S. Horner}48_,

J-Y. Hostachy55_{, S. Hou}151_{, A. Hoummada}135a_{, J. Howard}118_{, J. Howarth}82_,

M. Hrabovsky113_{, I. Hristova}16_{, J. Hrivnac}115_{, T. Hryn’ova}5_{, P.J. Hsu}81_{, S.-C. Hsu}138_,

D. Hu35_{, Z. Hubacek}30_{, F. Hubaut}83_{, F. Huegging}21_{, A. Huettmann}42_{, T.B. Huffman}118_,

E.W. Hughes35_{, G. Hughes}71_{, M. Huhtinen}30_{, M. Hurwitz}15_{, N. Huseynov}64 ,r_{, J. Huston}88_,

J. Huth57_{, G. Iacobucci}49_{, G. Iakovidis}10_{, M. Ibbotson}82_{, I. Ibragimov}141_,

L. Iconomidou-Fayard115_{, J. Idarraga}115_{, P. Iengo}102a_{, O. Igonkina}105_{, Y. Ikegami}65_,

M. Ikeno65, D. Iliadis154, N. Ilic158, T. Ince99, P. Ioannou9, M. Iodice134a, K. Iordanidou9, V. Ippolito132a,132b_{, A. Irles Quiles}167_{, C. Isaksson}166_{, M. Ishino}67_{, M. Ishitsuka}157_,

R. Ishmukhametov109_{, C. Issever}118_{, S. Istin}19a_{, A.V. Ivashin}128_{, W. Iwanski}39_,

H. Iwasaki65_{, J.M. Izen}41_{, V. Izzo}102a_{, B. Jackson}120_{, J.N. Jackson}73_{, P. Jackson}1_,

M.R. Jaekel30_{, V. Jain}2_{, K. Jakobs}48_{, S. Jakobsen}36_{, T. Jakoubek}125_{, J. Jakubek}126_,

D.O. Jamin151_{, D.K. Jana}111_{, E. Jansen}77_{, H. Jansen}30_{, J. Janssen}21_{, A. Jantsch}99_,

M. Janus48_{, R.C. Jared}173_{, G. Jarlskog}79_{, L. Jeanty}57_{, I. Jen-La Plante}31_{, G.-Y. Jeng}150_,

D. Jennens86_{, P. Jenni}30_{, A.E. Loevschall-Jensen}36_{, P. Jeˇz}36_{, S. J´ez´equel}5_{, M.K. Jha}20a_,

H. Ji173_{, W. Ji}81_{, J. Jia}148_{, Y. Jiang}33b_{, M. Jimenez Belenguer}42_{, S. Jin}33a_{, O. Jinnouchi}157_,

M.D. Joergensen36_{, D. Joffe}40_{, M. Johansen}146a,146b_{, K.E. Johansson}146a_{, P. Johansson}139_,

S. Johnert42_{, K.A. Johns}7_{, K. Jon-And}146a,146b_{, G. Jones}170_{, R.W.L. Jones}71_{, T.J. Jones}73_,

C. Joram30_{, P.M. Jorge}124a_{, K.D. Joshi}82_{, J. Jovicevic}147_{, T. Jovin}13b_{, X. Ju}173_,

C.A. Jung43_{, R.M. Jungst}30_{, V. Juranek}125_{, P. Jussel}61_{, A. Juste Rozas}12_{, S. Kabana}17_,

M. Kaci167_{, A. Kaczmarska}39_{, P. Kadlecik}36_{, M. Kado}115_{, H. Kagan}109_{, M. Kagan}57_,

E. Kajomovitz152_{, S. Kalinin}175_{, L.V. Kalinovskaya}64_{, S. Kama}40_{, N. Kanaya}155_,

M. Kaneda30_{, S. Kaneti}28_{, T. Kanno}157_{, V.A. Kantserov}96_{, J. Kanzaki}65_{, B. Kaplan}108_,

A. Kapliy31_{, D. Kar}53_{, M. Karagounis}21_{, K. Karakostas}10_{, M. Karnevskiy}58b_,

V. Kartvelishvili71_{, A.N. Karyukhin}128_{, L. Kashif}173_{, G. Kasieczka}58b_{, R.D. Kass}109_,

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

T. Kawamoto155_{, G. Kawamura}81_{, S. Kazama}155_{, V.F. Kazanin}107_{, M.Y. Kazarinov}64_,

R. Keeler169_{, P.T. Keener}120_{, R. Kehoe}40_{, M. Keil}54_{, G.D. Kekelidze}64_{, J.S. Keller}138_,

M. Kenyon53_{, H. Keoshkerian}5_{, O. Kepka}125_{, N. Kerschen}30_{, B.P. Kerˇsevan}74_,

S. Kersten175, K. Kessoku155, J. Keung158, F. Khalil-zada11, H. Khandanyan146a,146b,

A. Khanov112_{, D. Kharchenko}64_{, A. Khodinov}96_{, A. Khomich}58a_{, T.J. Khoo}28_,

G. Khoriauli21_{, A. Khoroshilov}175_{, V. Khovanskiy}95_{, E. Khramov}64_{, J. Khubua}51b_,

H. Kim146a,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. Kitamura66_{, T. Kittelmann}123_{, K. Kiuchi}160_{, E. Kladiva}144b_{, M. Klein}73_{, U. Klein}73_,

K. Kleinknecht81_{, M. Klemetti}85_{, A. Klier}172_{, P. Klimek}146a,146b_{, A. Klimentov}25_,

R. Klingenberg43_{, J.A. Klinger}82_{, E.B. Klinkby}36_{, T. Klioutchnikova}30_{, P.F. Klok}104_,

S. Klous105_{, E.-E. Kluge}58a_{, T. Kluge}73_{, P. Kluit}105_{, S. Kluth}99_{, 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. Kodys127_{, K. K¨oneke}30_{, A.C. K¨onig}104_{, S. Koenig}81_{, L. K¨opke}81_{, F. Koetsveld}104_,

P. Koevesarki21_{, T. Koffas}29_{, E. Koffeman}105_{, L.A. Kogan}118_{, S. Kohlmann}175_{, F. Kohn}54_,

Z. Kohout126_{, T. Kohriki}65_{, T. Koi}143_{, G.M. Kolachev}107,∗_{, H. Kolanoski}16_{, V. Kolesnikov}64_,

I. Koletsou89a_{, 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_{, R. Kopeliansky}152_{, S. Koperny}38_,

A.K. Kopp48_{, K. Korcyl}39_{, K. Kordas}154_{, A. Korn}118_{, A. Korol}107_{, I. Korolkov}12_,

E.V. Korolkova139_{, 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. Koutsman159a_{, R. Kowalewski}169_{, T.Z. Kowalski}38_{, W. Kozanecki}136_{, A.S. Kozhin}128_,

V. Kral126_{, V.A. Kramarenko}97_{, G. Kramberger}74_{, M.W. Krasny}78_{, A. Krasznahorkay}108_,

J.K. Kraus21_{, A. Kravchenko}25_{, S. Kreiss}108_{, F. Krejci}126_{, J. Kretzschmar}73_,

K. Kreutzfeldt52, N. Krieger54, P. Krieger158, K. Kroeninger54, H. Kroha99, J. Kroll120, J. Kroseberg21_{, J. Krstic}13a_{, U. Kruchonak}64_{, H. Kr¨uger}21_{, T. Kruker}17_{, N. Krumnack}63_,