CMS logoCMS event Hgg
Compact Muon Solenoid
LHC, CERN

CMS-TOP-16-005 ; CERN-EP-2016-265
Measurement of the $\mathrm{ t \bar{t} }$ production cross section using events in the e$\mu$ final state in pp collisions at $ \sqrt{s} = $ 13 TeV
EPJC 77 (2017) 172
Abstract: The cross section of top quark-antiquark pair production in proton-proton collisions at $ \sqrt{s} = $ 13 TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2 fb$^{-1}$. The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 815 $\pm$ 9 (stat) $\pm$ 38 (syst) $\pm$ 19 (lumi) pb, in agreement with the expectation from the standard model.
Figures & Tables Summary References CMS Publications
Figures

png pdf
Figure 1:
Distribution of the jet multiplicity in events passing the dilepton selection criteria. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; the last bin contains the overflow events. The ratio of data to the sum of the expected yields is given at the bottom of the figure. The error bars, which are within the size of the points, indicate the statistical uncertainties.

png pdf
Figure 2:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 2-a:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 2-b:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 2-c:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 2-d:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-a:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-b:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-c:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-d:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-e:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.

png pdf
Figure 3-f:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties.
Tables

png pdf
Table 1:
Summary of the individual contributions to the uncertainty in the $\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }$ measurement. The first and second uncertainty corresponds to the total and relative component, respectively. The total uncertainty in the result, calculated as the quadratic sum of the individual components, is also given.

png pdf
Table 2:
Number of dilepton events obtained after applying the full selection. The results are given for the individual sources of background, $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal with a top quark mass of 172.5 GeV and ${\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }} =$ 832$^{+40}_{-46}$ pb, and data. The uncertainties correspond to the statistical component.
Summary
A measurement of the $\mathrm{ t \bar{t} }$ production cross section in proton-proton collisions at $ \sqrt{s} = $ 13 TeV is presented for events containing an oppositely charged electron-muon pair, and two or more jets, of which at least one is tagged as originating from a b quark. The measurement is performed through an event-counting method based on a data sample corresponding to an integrated luminosity of 2.2 fb$^{-1}$. The measured cross section is

${\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } } }= $ 815 $\pm$ 9 (stat) $\pm$ 38 (syst) $\pm$ 19 (lumi) pb,

with a total relative uncertainty of 5.3%. The measurement, that supersedes [12], is consistent with recent measurements from the ATLAS [24] and CMS [12] experiments and with the standard model prediction of stt = 832$^{+40}_{-46}$ pb for a top quark mass of 172.5 GeV.
References
1 CMS Collaboration First measurement of the cross section for top-quark pair production in proton-proton collisions at $ \sqrt{s} $ = 7 TeV PLB 695 (2010) 424
2 CMS Collaboration Measurement of the $ \mathrm{t}\overline{\mathrm{t}} $ production cross section and the top quark mass in the dilepton channel in pp collisions at $ \sqrt{s} =7 $ TeV JHEP 07 (2011) 049
3 CMS Collaboration Measurement of the $ \mathrm{t}\overline{\mathrm{t}} $ production cross section in pp collisions at $ {\sqrt{s}=7 TeV} $ using the kinematic properties of events with leptons and jets EPJC 71 (2011) 1721
4 CMS Collaboration Measurement of the $ t\bar{t} $ production cross section in $ pp $ collisions at 7 TeV in lepton + jets events using $ b $-quark jet identification PRD 84 (2011) 092004
5 CMS Collaboration Measurement of the top quark pair production cross section in pp collisions at $ \sqrt{s} = 7 $ TeV in dilepton final states containing a $ \tau $ PRD 85 (2012) 112007 CMS-TOP-11-006
1203.6810
6 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the dilepton channel in pp collisions at $ \sqrt{s}=7 $ TeV JHEP 11 (2012) 067 CMS-TOP-11-005
1208.2671
7 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in pp collisions at $ \sqrt{s}=7 $ TeV with lepton + jets final states PLB 720 (2013) 83 CMS-TOP-11-003
1212.6682
8 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the $ \tau $+jets channel in pp collisions at $ \sqrt{s}=7 $$ TeV $ EPJC 73 (2013) 2386
9 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the all-jet final state in pp collisions at $ \sqrt{s} $ = 7 TeV JHEP 05 (2013) 065 CMS-TOP-11-007
1302.0508
10 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the dilepton channel in pp collisions at $ \sqrt{s} $ = 8 TeV JHEP 02 (2014) 024, , [Erratum: \DOI10.1007/JHEP02(2014)102] CMS-TOP-12-007
1312.7582
11 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in pp collisions at $ \sqrt s = 8 $ TeV in dilepton final states containing one $ \tau $ lepton PLB 739 (2014) 23 CMS-TOP-12-026
1407.6643
12 CMS Collaboration Measurement of the Top Quark Pair Production Cross Section in Proton-Proton Collisions at $ \sqrt{s}=13 $ TeV PRL 116 (2016) 052002 CMS-TOP-15-003
1510.05302
13 CMS Collaboration Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the e$ \mu $ channel in proton-proton collisions at $ \sqrt{s} = 7 $ and $ 8 $ TeV JHEP 08 (2016) 029 CMS-TOP-13-004
1603.02303
14 ATLAS Collaboration Measurement of the top quark-pair production cross section with ATLAS in $ pp $ collisions at $ \sqrt{s}=7 $ TeV EPJC 71 (2011) 1577 1012.1792
15 ATLAS Collaboration Measurement of the top quark pair production cross section in $ pp $ collisions at $ \sqrt{s}=7 $ TeV in dilepton final states with ATLAS PLB 707 (2012) 459 1108.3699
16 ATLAS Collaboration Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel PLB 711 (2012) 244 1201.1889
17 ATLAS Collaboration Measurement of the cross section for top-quark pair production in $ pp $ collisions at $ \sqrt{s}=7 $ TeV with the ATLAS detector using final states with two high-$ p_{\rm T} $ leptons JHEP 05 (2012) 059 1202.4892
18 ATLAS Collaboration Measurement of $ t \bar{t} $ production with a veto on additional central jet activity in $ pp $ collisions at $ \sqrt{s}=7 $ TeV using the ATLAS detector EPJC 72 (2012) 2043 1203.5015
19 ATLAS Collaboration Measurement of the top quark pair cross section with ATLAS in $ pp $ collisions at sqrt(s) = 7 TeV using final states with an electron or a muon and a hadronically decaying $ \tau $ lepton PLB 717 (2012) 89 1205.2067
20 ATLAS Collaboration Measurement of the $ t\bar t $ production cross section in the tau+jets channel using the ATLAS detector EPJC 73 (2013) 2328 1211.7205
21 ATLAS Collaboration Measurement of the $ t\overline{t} $ production cross-section using $ e\mu $ events with $ b $-tagged jets in $ pp $ collisions at $ \sqrt{s}=7 $ and 8 TeV with the ATLAS detector EPJC 74 (2014) 3109 1406.5375
22 ATLAS Collaboration Measurement of the $ t\overline{t} $ production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector JHEP 01 (2015) 020 1407.0891
23 ATLAS Collaboration Measurement of the top pair production cross section in 8 TeV proton-proton collisions using kinematic information in the lepton+jets final state with ATLAS PRD 91 (2015) 112013 1504.04251
24 ATLAS Collaboration Measurement of the $ t\bar{t} $ production cross-section using $ e\mu $ events with b-tagged jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector PLB 761 (2016) 136 1606.02699
25 M. Czakon, M. L. Mangano, A. Mitov, and J. Rojo Constraints on the gluon PDF from top quark pair production at hadron colliders JHEP 07 (2013) 167 1303.7215
26 ATLAS Collaboration ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider EPJC 75 (2015) 510, , [Erratum:\DOI10.1140/epjc/s10052-016-3935-x] 1506.08616
27 CMS Collaboration The CMS experiment at the CERN LHC JINST 3 (2008) S08004 CMS-00-001
28 S. Frixione, P. Nason, and C. Oleari Matching NLO QCD computations with parton shower simulations: the POWHEG method JHEP 11 (2007) 070 0709.2092
29 S. Alioli, P. Nason, C. Oleari, and E. Re A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX JHEP 06 (2010) 043 1002.2581
30 F. Demartin et al. The impact of PDF and $ \alpha_s $ uncertainties on Higgs Production in gluon fusion at hadron colliders PRD 82 (2010) 014002 1004.0962
31 T. Sj\"ostrand, S. Mrenna, and P. Skands PYTHIA 6.4 physics and manual JHEP 05 (2006) 026 hep-ph/0603175
32 T. Sj\"ostrand et al. An Introduction to PYTHIA 8.2 CPC 191 (2015) 159 1410.3012
33 CMS Collaboration Underlying Event Tunes and Double Parton Scattering CDS
34 P. Skands, S. Carrazza, and J. Rojo Tuning PYTHIA 8.1: the Monash 2013 tune EPJC 74 (2014) 3024 1404.5630
35 M. B\"ahr et al. Herwig++ physics and manual EPJC 58 (2008) 639 0803.0883
36 J. Alwall et al. The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations JHEP 07 (2014) 079 1405.0301
37 P. Artoisenet, R. Frederix, O. Mattelaer, and R. Rietkerk Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations JHEP 03 (2013) 015 1212.3460
38 S. Alioli, P. Nason, C. Oleari, and E. Re NLO single-top production matched with shower in POWHEG: $ s $- and $ t $-channel contributions JHEP 09 (2009) 111, , [Erratum: \DOI10.1007/JHEP02(2010)011] 0907.4076
39 E. Re Single-top Wt-channel production matched with parton showers using the POWHEG method EPJC 71 (2011) 1547 1009.2450
40 N. Kidonakis Top Quark Production Proceedings, Helmholtz International Summer School on Physics of Heavy Quarks and Hadrons (HQ 2013) (2014) 139 1311.0283
41 J. M. Campbell and R. K. Ellis MCFM for the Tevatron and the LHC NPPS 205-206 (2010) 10 1007.3492
42 M. Czakon and A. Mitov Top++: A Program for the Calculation of the Top-Pair Cross-Section at Hadron Colliders CPC 185 (2014) 2930 1112.5675
43 M. Czakon, P. Fiedler and A. Mitov The total top quark production cross-section at hadron colliders through O($ \alpha_S^4 $) PRL 110 (2013) 252004 1303.6254
44 S. Alekhin et al. The PDF4LHC Working Group Interim Report 1101.0536
45 M. Botje et al. The PDF4LHC Working Group Interim Recommendations 1101.0538
46 A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt Parton distributions for the LHC EPJC 63 (2009) 189 0901.0002
47 A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt Uncertainties on $ \alpha_s $ in global PDF analyses and implications for predicted hadronic cross sections EPJC 64 (2009) 653 0905.3531
48 H.-L. Lai et al. New parton distributions for collider physics PRD 82 (2010) 074024 1007.2241
49 J. Gao et al. CT10 next-to-next-to-leading order global analysis of QCD PRD 89 (2014) 033009 1302.6246
50 NNPDF Collaboration Parton distributions with LHC data Nucl. Phys. B 867 (2013) 244 1207.1303
51 CMS Collaboration Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET CDS
52 CMS Collaboration Commissioning of the Particle-flow Event Reconstruction with the first LHC collisions recorded in the CMS detector CDS
53 CMS Collaboration Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at $ \sqrt{s} = 8 $$ TeV $ JINST 10 (2015) P06005
54 CMS Collaboration Performance of CMS muon reconstruction in pp collision events at $ \sqrt{s}=7 $ TeV JINST 7 (2012) P10002 CMS-MUO-10-004
1206.4071
55 CMS Collaboration Measurements of Inclusive W and Z Cross Sections in pp Collisions at $ \sqrt{s}=7 $ TeV JHEP 01 (2011) 080 CMS-EWK-10-002
1012.2466
56 M. Cacciari, G. P. Salam, and G. Soyez The anti-$ k_t $ jet clustering algorithm JHEP 04 (2008) 063 0802.1189
57 M. Cacciari, G. P. Salam, and G. Soyez FastJet user manual EPJC 72 (2012) 1896 1111.6097
58 CMS Collaboration Determination of jet energy calibration and transverse momentum resolution in CMS JINST 6 (2011) P11002
59 CMS Collaboration Identification of b-quark jets with the CMS experiment JINST 8 (2013) P04013 CMS-BTV-12-001
1211.4462
60 CMS Collaboration Identification of b quark jets at the CMS experiment in the LHC Run2 CDS
61 ATLAS Collaboration Measurement of the Inelastic Proton-Proton Cross Section at $ \sqrt{s} = 13 $ TeV with the ATLAS Detector at the LHC PRL 117 (2016) 182002 1606.02625
62 CMS Collaboration Measurement of the single-top-quark $ t $-channel cross section in pp collisions at $ \sqrt{s} $ = 7 TeV JHEP 12 (2012) 035 CMS-TOP-11-021
1209.4533
63 CMS Collaboration Observation of the Associated Production of a Single Top Quark and a $ W $ Boson in $ pp $ Collisions at $ \sqrt{s} = $ 8 TeV PRL 112 (2014) 231802
64 CMS Collaboration Evidence for Associated Production of a Single Top Quark and $ W $ Boson in $ pp $ collisions at $ \sqrt{s} $ = 7$ TeV $ PRL 110 (2013) 022003
65 CMS Collaboration Measurement of the W$ ^+ $W$ ^- $ and ZZ production cross section in pp collisions at $ \sqrt{s} $ = 8 TeV PLB 721 (2013) 190 CMS-SMP-12-024
1301.4698
66 CMS Collaboration Measurement of the W$ ^+ $W$ ^- $ cross section in pp collisions at $ \sqrt{s}=7 $ TeV and limits on anomalous WW$ \gamma $ and WWZ couplings EPJC 73 (2013) 2610 CMS-SMP-12-005
1306.1126
67 CMS Collaboration Measurement of $ \mathrm{ W^{+} }\mathrm{ W^{-} } $ production and search for the Higgs boson in pp collisions at $ \sqrt{s} $ = 7 TeV PLB 699 (2011) 25
68 CMS Collaboration Measurement of the ZZ production cross section and $ Z\rightarrow\ell^+\ell^-\ell^{'+}\ell^{'-} $ branching fraction in pp collisions at $ \sqrt{s} $ = 13 TeV $Submitted to PLB$ CMS-SMP-16-001
1607.08834
69 CMS Collaboration Measurement of the WZ production cross section in pp collisions at $ \sqrt{s} $ = 13 TeV $Submitted to PLB$ CMS-SMP-16-002
1607.06943
70 ATLAS Collaboration Measurement of the WW cross section in $ \sqrt{s} $ = 7 TeV pp collisions with the ATLAS detector and limits on anomalous gauge couplings PLB 712 (2012) 289 1203.6232
71 ATLAS Collaboration Measurement of the W$ ^{\pm} $Z production cross section and limits on anomalous triple gauge couplings in proton-proton collisions at $ \sqrt{s} $ = 7 TeV with the ATLAS detector PLB 709 (2012) 341 1111.5570
72 ATLAS Collaboration Measurement of the $ ZZ $ Production Cross Section and Limits on Anomalous Neutral Triple Gauge Couplings in Proton-Proton Collisions at $ \sqrt{s} $ = 7 TeV with the ATLAS Detector PRL 108 (2012) 041804 1110.5016
Compact Muon Solenoid
LHC, CERN