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 - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue Physics Letters B Année : 2016

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

M. Aaboud , Z. Barnovska (1) , N. Berger (1) , M. Delmastro (1) , L. Di Ciaccio (1) , S. Elles (1) , K. Grevtsov (1) , T. Hryn’ova (1) , S. Jézéquel (1) , I. Koletsou (1) , R. Lafaye (1) , Jérémy Lévêque (1) , P. Mastrandea (1) , G. Sauvage (1) , E. Sauvan (1) , O. Simard (1) , T. Todorov (1) , I. Wingerter-Seez (1) , E. Yatsenko (1) , M.K. Ayoub (2) , A. Bassalat (2) , S. Binet (2) , C. Becot , C. Bourdarios (2) , J.B. de Vivie de Regie (2) , D. Delgove (2) , L. Duflot (2) , M. Escalier (2) , L. Fayard (2) , D. Fournier (2) , E.L. Gkougkousis (2) , J.-F. Grivaz (2) , T. Guillemin (2) , F. Hariri (2) , S. Henrot-Versille (2) , J. Hrivnac (2) , L. Iconomidou-Fayard (2) , M. Kado (2) , A. Lounis (2) , N. Makovec (2) , N. Morange (2) , C. Nellist (2) , P. Petroff (2) , L. Poggioli (2) , P. Puzo (2) , A. Renaud (2) , G. Rybkin (2) , D. Rousseau (2) , A.C. Schaffer (2) , L. Serin (2) , E. Scifo (2) , S. Simion (2) , R. Tanaka (2) , D. Zerwas (2) , Zhongkai Zhang (2) , Y. Zhao (2) , G. Rahal (3) , D. Boumediene (4) , E. Busato (4) , D. Calvet (4) , S. Calvet (4) , A.R. Chomont (4) , J. Donini (4) , Ph. Gris (4) , R. Madar (4) , D. Pallin (4) , S.M. Romano Saez (4) , C. Santoni (4) , D. Simon (4) , F. Vazeille (4) , G. Aad (5) , M. Alstaty (5) , M. Barbero (5) , A. Calandri (5) , T.P. Calvet (5) , Y. Coadou (5) , C. Diaconu (5) , Sara Diglio (5) , F. Djama (5) , V. Ellajosyula (5) , L. Feligioni (5) , A. Hadef (5) , G.D. Hallewell (5) , F. Hubaut (5) , S.J. Kahn (5) , E. B. F. G. Knoops (5) , E. Le Guirriec (5) , J. Liu (5) , K. Liu (5) , D. Madaffari (5) , E. Monnier (5) , S. Muanza (5) , E. Nagy (5) , P. Pralavorio (5) , Y. Rodina (5) , A. Rozanov (5) , M. Talby (5) , T. Theveneaux-Pelzer (5) , R.E. Ticse Torres (5) , S. Tisserant (5) , J. Toth (5) , F. Touchard (5) , L. Vacavant (5) , Chen Wang (5) , S. Albrand (6) , S. Berlendis (6) , C. Camincher (6) , J. Collot (6) , S. Crépé-Renaudin (6) , P.A. Delsart (6) , C. Gabaldon (6) , M.H. Genest (6) , P.O.J. Gradin (6) , J.Y. Hostachy (6) , F. Ledroit-Guillon (6) , A. Lleres (6) , A. Lucotte (6) , F. Malek (6) , E. Petit (6) , J. Stark (6) , B. Trocmé (6) , M. Wu (6)
M. Aaboud
  • Fonction : Auteur
N. Berger
T. Hryn’ova
C. Becot
  • Fonction : Auteur
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996
G. Aad
Y. Coadou
Chen Wang
  • Fonction : Auteur
  • PersonId : 829307

Résumé

This paper describes a measurement of the inclusive top quark pair production cross-section ($\sigma_{t\bar{t}}$) with a data sample of 3.2 fb$^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\sqrt{s}$=13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron--muon pair in the final state. Jets containing $b$-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two $b$-tagged jets are counted and used to determine simultaneously $\sigma_{t\bar{t}}$ and the efficiency to reconstruct and $b$-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: $\sigma_{t\bar{t}}$= 818 $\pm$ 8 (stat) $\pm$ 27 (syst) $\pm$ 19 (lumi) $\pm$ 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented.

Dates et versions

in2p3-01329377 , version 1 (09-06-2016)

Identifiants

Citer

M. Aaboud, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. 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. Physics Letters B, 2016, 761, pp.136-157. ⟨10.1016/j.physletb.2016.08.019⟩. ⟨in2p3-01329377⟩
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