Measurement of the tt¯ production cross-section using eμ events with b-tagged jets in pp collisions at √s = 7 and 8 TeV with the ATLAS detector

Aad, G.

doi:10.1140/epjc/s10052-014-3109-7

Title: Measurement of the tt¯ production cross-section using eμ events with b-tagged jets in pp collisions at √s = 7 and 8 TeV with the ATLAS detector

Journal Article · Wed Oct 29 00:00:00 EDT 2014 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-014-3109-7· OSTI ID:1225721

Aad, G. ^[1]

Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France). et al.

The inclusive top quark pair (tt) production cross-section σ tt has been measured in proton–proton collisions at √s = 7 TeV and√s = 8 TeV with the ATLAS experiment at the LHC, using tt events with an opposite-charge eμ pair in the final state. The measurement was performed with the 2011 7 TeV dataset corresponding to an integrated luminosity of 4.6 fb -1 and the 2012 8 TeV dataset of 20.3 fb -1 . The numbers of events with exactly one and exactly two b-tagged jets were counted and used to simultaneously determine σ tt and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section was measured to be: σ tt = 182.9 ± 3.1 ± 4.2 ± 3.6 ± 3.3 pb (√s = 7 TeV) and σ tt = 242.4 ± 1.7 ± 5.5 ± 7.5 ± 4.2 pb (√s = 8 TeV), where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, knowledge of the integrated luminosity and of the LHC beam energy. The results are consistent with recent theoretical QCD calculations at next-to-next-to-leading order. Fiducial measurements corresponding to the experimental acceptance of the leptons are also reported, together with the ratio of cross-sections measured at the two centre-of-mass energies. The inclusive cross-section results were used to determine the top quark pole mass via the dependence of the theoretically predicted cross-section on m pole t giving a result of m pole t = 172.9 +2.5 -2.6 GeV. By looking for an excess of tt production with respect to the QCD prediction, the results were also used to place limits on the pair-production of supersymmetric top squarks t 1 with masses close to the top quark mass, decaying via t 1 → t χ 0 1 to predominantly right-handed top quarks and a light neutralino χ 0 1 , the lightest supersymmet-ric particle. Top squarks with masses between the top quark mass and 177 GeV are excluded at the 95 % confidence level.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: ATLAS Collaboration

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515

OSTI ID:: 1225721

Alternate ID(s):: OSTI ID: 1225376; OSTI ID: 1407254

Journal Information:: European Physical Journal. C, Particles and Fields, Vol. 74, Issue 10; ISSN 1434-6044

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 142 works

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Measurement of the $$t\bar{t}$$ production cross-section and lepton differential distributions in $$e\mu $$ dilepton events from pp collisions at $$\sqrt{s}=13\,\text {TeV}$$ with the ATLAS detector Aad, G.; Abbott, B.; Abbott, D. C. The European Physical Journal C, Vol. 80, Issue 6 https://doi.org/10.1140/epjc/s10052-020-7907-9	journal	June 2020
Soft-gluon corrections in top-quark production Kidonakis, Nikolaos International Journal of Modern Physics A, Vol. 33, Issue 25 https://doi.org/10.1142/s0217751x18300211	journal	September 2018
Impact of the top quark cross-section data on parton distribution functions Azizi, M.; Khorramian, A.; Abdolmaleki, H. International Journal of Modern Physics A, Vol. 33, Issue 24 https://doi.org/10.1142/s0217751x18501427	journal	August 2018
Pinning down the large-x gluon with NNLO top-quark pair differential distributions Czakon, Michal Wiktor; Hartland, Nathan P.; Mitov, Alexander RWTH Aachen University https://doi.org/10.18154/rwth-2017-04516	text	January 2017
Exploring the nearly degenerate stop region with sbottom decays An, Haipeng; Gu, Jiayin; Wang, Lian-Tao Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2016-05828	text	January 2016

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Measurement of the

t \bar{t}

production cross-section using

e μ

events with

b

-tagged jets in

p p

collisions at

\sqrt{s} = 7

and 8 TeV with the ATLAS detector

Dataset · Sun Jun 01 00:00:00 EDT 2014 · OSTI ID:1225721

Aad, Georges

Measurement of the $t\bar{t}$ production cross-section and lepton differential distributions in $e\mu$ dilepton events from pp collisions at $\sqrt{s}=13\,\text {TeV}$ with the ATLAS detector

Journal Article · Fri Jun 12 00:00:00 EDT 2020 · European Physical Journal. C, Particles and Fields · OSTI ID:1225721

Aad, G.; Abbott, B.; Abbott, D. C.; +2951 more

Measurement of the

t \bar{t}

production cross-section using eμ events with b-tagged jets in pp collisions at

\sqrt{s} = 13 TeV

with the ATLAS detector

Journal Article · Sat Oct 01 00:00:00 EDT 2016 · Physics Letters B · OSTI ID:1225721

Aaboud, M.; Aad, G.; Abbott, B.; +2852 more

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Measurement of the $t \bar{t}$ production cross-section using eμ events with b-tagged jets in pp collisions at $\sqrt{s} = 7$ and 8 TeV with the ATLAS detector [Supplemental Data] https://doi.org/10.17182/hepdata.65210 The current record is supplemented by this dataset	dataset	October 2014
Measurement of the $t \bar{t}$ production cross-section using eμ events with b-tagged jets in pp collisions at √s = 7 and 8 TeV with the ATLAS detector [Supplemental Data] https://doi.org/10.17182/hepdata.65210.v1 The current record is supplemented by this dataset	dataset	October 2014
"Table 2" of "Measurement of the $t\bar{t}$ 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" Collaboration, Atlas https://doi.org/10.17182/hepdata.65210.v1/t2 The current record is supplemented by this dataset	dataset	January 2014