CMS-TOP-15-003 ; CERN-PH-EP-2015-280 | ||
Measurement of the top quark pair production cross section in proton-proton collisions at $\sqrt{s}= $ 13TeV | ||
CMS Collaboration | ||
18 October 2015 | ||
Phys. Rev. Lett. 116 (2016) 052002 | ||
Abstract: The top quark pair production cross section is measured for the first time in proton-proton collisions at $ \sqrt{s} = $ 13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 pb$^{-1}$. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746 $\pm$ 58 (stat) $\pm$ 53 (syst) $\pm$ 36 (lumi) pb, in agreement with the expectation from the standard model. | ||
Links: e-print arXiv:1510.05302 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; |
Figures & Tables | Summary | Additional Figures | References | CMS Publications |
---|
Figures | |
png pdf |
Figure 1:
The distributions in (left ) the jet multiplicity, and (right ) $H_\mathrm {T}$ in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. |
png pdf |
Figure 1-a:
The distribution in the jet multiplicity in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
png pdf |
Figure 1-b:
The distribution in $H_\mathrm {T}$ in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
png pdf |
Figure 2:
The distributions in (left ) the dilepton invariant mass, and (right ) the difference in the azimuthal angle between the two leptons after all selections. The last bin in (left ) contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. |
png pdf |
Figure 2-a:
The distribution in the dilepton invariant mass. The last bin contains the overflow events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
png pdf |
Figure 2-b:
The distribution in the difference in the azimuthal angle between the two leptons after all selections. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
Tables | |
png pdf |
Table 1:
Summary of individual contributions to the systematic uncertainty in the $\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }$ measurement. The uncertainties are given in pb, and as relative uncertainties. The separate total systematic uncertainty without integrated luminosity, the part attributed to the integrated luminosity, and the statistical contributions are added in quadrature to obtain the total uncertainty. |
png pdf |
Table 2:
The number of e$ \mu$ events after final event selection expected for background, and observed in data. The uncertainties represent the statistical and systematic components added in quadrature. |
Summary |
Additional Figures | |
png pdf |
Additional Figure 1:
The $ \mathrm{ t \bar{t} } $ production cross section in $\mathrm{ p \bar{p} } $ and $\mathrm{ p p } $ collisions as a function of $\sqrt{s}$. The Tevatron combination is given at $\sqrt{s}=$ 1.96 TeV [79], as are the CMS results at 7 and 8 TeV in the dilepton channels [14,19]. The CMS result at 13 TeV is also shown in the figure where the inner error bar corresponds to the statistical uncertainty and the outer one to the total uncertainty. The measurements are compared to NNLO+NNLL theoretical predictions [45]. |
References | ||||
1 | 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 |
2 | ATLAS Collaboration | Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at $ \sqrt{s} = $ 7 TeV in the ATLAS detector | JHEP 06 (2015) 100 | 1502.05923 |
3 | ATLAS Collaboration | Measurement of the $ \rm 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 |
4 | ATLAS Collaboration | Simultaneous measurements of the $ \rm t\bar{t} $, $ \rm W^+W^- $, and $ \mathrm{ Z } / \gamma^{*} \rightarrow \tau\tau $ production cross-sections in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV with the ATLAS detector | PRD 91 (2015) 052005 | 1407.0573 |
5 | ATLAS Collaboration | Measurements of normalized differential cross sections for $ \rm t\bar{t} $ production in pp collisions at $ \sqrt{s} = $ 7 TeV using the ATLAS detector | PRD 90 (2014) 072004 | 1407.0371 |
6 | ATLAS Collaboration | Measurement of the $ \rm t\overline{t} $ production cross-section using $ \mathrm{ e }\mu\ $ events with $ \rm b $-tagged jets in $ \rm pp $ collisions at $ \sqrt{s}=$ 7 and 8 TeV with the ATLAS detector | EPJC 74 (2014) 3109 | 1406.5375 |
7 | ATLAS Collaboration | Measurement of the $ \mathrm{ t \bar{t} } $ production cross section in the tau+jets channel using the ATLAS detector | EPJC 73 (2013) 2328 | 1211.7205 |
8 | 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 |
9 | ATLAS Collaboration | Measurement of $ \rm 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 |
10 | ATLAS Collaboration | Measurement of the cross section for top-quark pair production in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV with the ATLAS detector using final states with two high-$ p_{\mathrm{T}} $ leptons | JHEP 05 (2012) 059 | 1202.4892 |
11 | ATLAS Collaboration | Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel | PLB 711 (2012) 244 | 1201.1889 |
12 | CMS Collaboration | Measurement of the differential cross section for top quark pair production in pp collisions at $ \sqrt{s} = $ 8 TeV | CMS-TOP-12-028 1505.04480 |
|
13 | CMS Collaboration | Measurement of the $ \rm t \bar t $ production cross section in $ \rm 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 |
14 | CMS Collaboration | Measurement of the $ \rm t \bar{t} $ production cross section in the dilepton channel in pp collisions at $ \sqrt{s} = $ 8 TeV | JHEP 02 (2014) 024 | CMS-TOP-12-007 1312.7582 |
15 | CMS Collaboration | Measurement of the $ \rm 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 |
16 | 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 | CMS-TOP-11-004 1301.5755 |
17 | CMS Collaboration | Measurement of the $ \rm t\bar{t} $ production cross section in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV with lepton + jets final states | PLB 720 (2013) 83 | CMS-TOP-11-003 1212.6682 |
18 | CMS Collaboration | Measurement of differential top-quark-pair production cross sections in $ \rm pp $ colisions at $ \sqrt{s} = $ 7 TeV | EPJC 73 (2013) 2339 | CMS-TOP-11-013 1211.2220 |
19 | CMS Collaboration | Measurement of the $ \rm t\bar{t} $ production cross section in the dilepton channel in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV | JHEP 11 (2012) 067 | CMS-TOP-11-005 1208.2671 |
20 | CMS Collaboration | Measurement of the $ \mathrm{ t \bar{t} }\ $ production cross section in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV in dilepton final states containing a $ \tau $ | PRD 85 (2012) 112007 | CMS-TOP-11-006 1203.6810 |
21 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
22 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with parton shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
23 | 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 |
24 | ATLAS, CDF, CMS and D0 collaborations | First combination of Tevatron and LHC measurements of the top-quark mass | 1403.4427 | |
25 | F. Demartin et al. | Impact of parton distribution function and $ \alpha_S $ uncertainties on Higgs boson production in gluon fusion at hadron colliders | PRD 82 (2010) 014002 | 1004.0962 |
26 | T. Sjostrand, S. Mrenna, and P. Skands | PYTHIA 6.4 physics and manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
27 | T. Sjostrand et al. | An introduction to PYTHIA 8.2 | CPC 191 (2015) 159 | 1410.3012 |
28 | CMS Collaboration | Underlying Event Tunes and Double Parton Scattering | CDS | |
29 | P. Skands, S. Carrazza, and J. Rojo | Tuning PYTHIA 8.1: the Monash 2013 tune | EPJC 74 (2014) 3024 | 1404.5630 |
30 | M. Bahr et al. | Herwig++ physics and manual | EPJC 58 (2008) 639 | 0803.0883 |
31 | 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 |
32 | 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 |
33 | CMS Collaboration | Measurement of $ \mathrm{ t \bar{t} }\ $ production with additional jet activity, including b quark jets, in the dilepton channel using pp collisions at $ \sqrt{s} = $ 8 TeV | Submitted to EPJC | CMS-TOP-12-041 1510.03072 |
34 | 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 | 0907.4076 |
35 | E. Re | Single-top Wt-channel production matched with parton showers using the POWHEG method | EPJC 71 (2011) 1547 | 1009.2450 |
36 | N. Kidonakis | Top Quark Production | in Proceedings, Helmholtz International Summer School on Physics of Heavy Quarks and Hadrons (HQ 2013), p. 139 Verlag Deutsches Elektronen-Synchrotron, Hamburg | 1311.0283 |
37 | J. M. Campbell and R. K. Ellis | MCFM for the Tevatron and the LHC | NPPS 205 (2010) 10 | 1007.3492 |
38 | 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 |
39 | M. Beneke, P. Falgari, S. Klein, and C. Schwinn | Hadronic top-quark pair production with NNLL threshold resummation | Nucl. Phys. B 855 (2012) 695 | 1109.1536 |
40 | M. Cacciari et al. | Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation | PLB 710 (2012) 612 | 1111.5869 |
41 | P. Baernreuther, M. Czakon, and A. Mitov | Percent-Level-Precision Physics at the Tevatron: Next-to-Next-to-Leading Order QCD Corrections to $ \rm q \bar{q} \to t \bar{t} + X $ | PRL 109 (2012) 132001 | 1204.5201 |
42 | M. Czakon and A. Mitov | NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels | JHEP 12 (2012) 054 | 1207.0236 |
43 | M. Czakon and A. Mitov | NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction | JHEP 01 (2013) 080 | 1210.6832 |
44 | M. Czakon, P. Fiedler and A. Mitov | Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through O($ \alpha_S^4 $) | PRL 110 (2013) 252004 | 1303.6254 |
45 | M. Botje et al. | The PDF4LHC Working Group Interim Recommendations | 1101.0538 | |
46 | S. Alekhin et al. | The PDF4LHC Working Group Interim Report | 1101.0536 | |
47 | A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt | Parton distributions for the LHC | EPJC 63 (2009) 189 | 0901.0002 |
48 | 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 |
49 | H.-L. Lai et al. | New parton distributions for collider physics | PRD 82 (2010) 074024 | 1007.2241 |
50 | J. Gao et al. | CT10 next-to-next-to-leading order global analysis of QCD | PRD 89 (2014) 033009 | 1302.6246 |
51 | NNPDF Collaboration | Parton distributions with LHC data | Nucl. Phys. B 867 (2013) 244 | 1207.1303 |
52 | CMS Collaboration | Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET | CDS | |
53 | CMS Collaboration | Commissioning of the Particle-flow Event Reconstruction with the first LHC collisions recorded in the CMS detector | CDS | |
54 | 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 | CMS-EGM-13-001 1502.02701 |
55 | CMS Collaboration | The performance of the CMS muon detector in proton-proton collisions at $ \sqrt{s} = $ 7 TeV at the LHC | JINST 8 (2013) P11002 | CMS-MUO-11-001 1306.6905 |
56 | 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 |
57 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_{\rm t} $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
58 | CMS Collaboration | Determination of jet energy calibration and transverse momentum resolution in CMS | JINST 6 (2011) P11002 | CMS-JME-10-011 1107.4277 |
59 | CMS Collaboration | Measurement of the $ \rm t\bar{t} $ production cross section and the top quark mass in the dilepton channel in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV | JHEP 07 (2011) 049 | CMS-TOP-11-002 1105.5661 |
60 | CMS Collaboration | First measurement of the cross section for top-quark pair production in proton-proton collisions at $ \sqrt{s} = $ 7 TeV | PLB 695 (2011) 424 | CMS-TOP-10-001 1010.5994 |
61 | G. Mahlon and S. J. Parke | Spin correlation effects in top quark pair production at the LHC | PRD 81 (2010) 074024 | 1001.3422 |
62 | W. Bernreuther and Z.-G. Si | Top quark spin correlations and polarization at the LHC: standard model predictions and effects of anomalous top chromo moments | PLB 725 (2013) 115 | 1305.2066 |
63 | ATLAS Collaboration | Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $ \sqrt{s} = $ 8 TeV Using the ATLAS Detector | PRL 114 (2015) 142001 | 1412.4742 |
64 | ATLAS Collaboration | Measurements of spin correlation in top-antitop quark events from proton-proton collisions at $ \sqrt{s} = $ 7 TeV using the ATLAS detector | PRD 90 (2014) 112016 | 1407.4314 |
65 | ATLAS Collaboration | Observation of spin correlation in $ \rm t \bar{t} $ events from pp collisions at $ \sqrt{s} = $ 7 TeV using the ATLAS detector | PRL 108 (2012) 212001 | 1203.4081 |
66 | CMS Collaboration | Measurements of $ \rm t\bar{t} $ spin correlations and top-quark polarization using dilepton final states in $ \rm pp $ collisions at $ \sqrt{s} = $ 7 TeV | PRL 112 (2014) 182001 | CMS-TOP-13-003 1311.3924 |
67 | CMS Collaboration | CMS Luminosity Based on Pixel Cluster Counting - Summer 2013 Update | CMS-PAS-LUM-13-002 | CMS-PAS-LUM-13-002 |
68 | CMS Collaboration | Measurement of the W$ ^+ $W$ ^- $ and ZZ production cross sections in pp collisions at $ \sqrt{s} = $ 8 TeV | PLB 721 (2013) 190 | CMS-SMP-12-024 1301.4698 |
69 | 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 |
70 | CMS Collaboration | Measurement of W$ ^+ $W$ ^- $ production and search for the Higgs boson in pp collisions at $ \sqrt{s} = $ 7 TeV | PLB 699 (2011) 25 | CMS-EWK-10-009 1102.5429 |
71 | CMS Collaboration | Measurement of the sum of WW and WZ production with W+dijet events in pp collisions at $ \sqrt{s} = $ 7 TeV | EPJC 73 (2013) 2283 | CMS-SMP-12-015 1210.7544 |
72 | CMS Collaboration | Measurement of the ZZ production cross section and search for anomalous couplings in $ 2\ell $ $ 2\ell' $ final states in pp collisions at $ \sqrt{s} = $ 7 TeV | JHEP 01 (2013) 063 | CMS-SMP-12-007 1211.4890 |
73 | 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 |
74 | 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 |
75 | 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 |
76 | ATLAS Collaboration | Measurement of the $ \rm 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 |
77 | CMS Collaboration | Identification of b-quark jets with the CMS experiment | JINST 8 (2013) P04013 | CMS-BTV-12-001 1211.4462 |
78 | D. A. S. Fraser, N. Reid, and A. C. M. Wong | Inference for bounded parameters | PRD 69 (2004) 033002 | |
79 | CDF and D0 Collaborations | Combination of measurements of the top-quark pair production cross section from the Tevatron Collider | PRD 89 (2014) 072001 | 1309.7570 |
Compact Muon Solenoid LHC, CERN |