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Measurements of top-quark pair differential cross-sections in the $e\mu$ channel in $pp$ collisions at $\sqrt{s} = 13$ TeV using the ATLAS detector

M Aaboud N. Berger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 1 K. Grevtsov 1 T. Guillemin 1 T. Hryn’ova 1 S. Jézéquel 1 I. Koletsou 1 R. Lafaye 1 Jérémy Lévêque 1 P. Mastrandea 1 E. Sauvan 1 B.H. Smart 1 T. Todorov 1 I. Wingerter-Seez 1 E. Yatsenko 1 S. Albrand 2 S. Berlendis 2 A. Bethani 2 C. Camincher 2 J. Collot 2 S. Crépé-Renaudin 2 P.A. Delsart 2 C. Gabaldon 2 M.H. Genest 2 P.O.J. Gradin 2 J.Y. Hostachy 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 E. Petit 2 J. Stark 2 B. Trocmé 2 M. Wu 2 G. Rahal 3 G. Aad 4 M. Alstaty 4 M. Barbero 4 A. Calandri 4 T.P. Calvet 4 Y. Coadou 4 C. Diaconu 4 F. Djama 4 V. Ellajosyula 4 L. Feligioni 4 A. Hadef 4 G.D. Hallewell 4 F. Hubaut 4 S.J. Kahn 4 E. B. F. G. Knoops 4 E. Le Guirriec 4 J. Liu 4 K. Liu 4 D. Madaffari 4 E. Monnier 4 S. Muanza 4 E. Nagy 4 P. Pralavorio 4 Y. Rodina 4 A. Rozanov 4 M. Talby 4 T. Theveneaux-Pelzer 4 R.E. Ticse Torres 4 S. Tisserant 4 J. Toth 5, 4 F. Touchard 4 L. Vacavant 4 Chen Wang 6, 4 D. Boumediene 7 E. Busato 7 D. Calvet 7 S. Calvet 7 A.R. Chomont 7 J. Donini 7 S. Ganguly 7 Ph. Gris 7 R. Madar 7 D. Pallin 7 S.M. Romano Saez 7 C. Santoni 7 D. Simon 7 F. Vazeille 7
Abstract : This article presents measurements of $t\bar{t}$ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb$^{-1}$ of proton--proton data at a centre-of-mass energy of $\sqrt{s} = 13$ TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark, and of the transverse momentum, absolute rapidity and invariant mass of the $t\bar{t}$ system. The $t\bar{t}$ events are selected by requiring one electron and one muon of opposite electric charge, and at least two jets, one of which must be tagged as containing a $b$-hadron. The measured differential cross-sections are compared to predictions of next-to-leading order generators matched to parton showers and the measurements are found to be consistent with all models within the experimental uncertainties with the exception of the POWHEG-Box + HERWIG++ predictions, which differ significantly from the data in both the transverse momentum of the top quark and the mass of the $t\bar{t}$ system.
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Submitted on : Friday, December 16, 2016 - 10:06:43 AM
Last modification on : Friday, January 7, 2022 - 3:43:25 AM

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M Aaboud, N. Berger, M. Delmastro, L. Di Ciaccio, S. Elles, et al.. Measurements of top-quark pair differential cross-sections in the $e\mu$ channel in $pp$ collisions at $\sqrt{s} = 13$ TeV using the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77, pp.292. ⟨10.1140/epjc/s10052-017-4821-x⟩. ⟨in2p3-01417857⟩



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