Measurements of top quark spin observables in $t\bar{t}$ events using dilepton final states in $\sqrt{s} = 8$ TeV $pp$ collisions with the ATLAS detector

M. Aaboud N. Berger 1 A.M. Burger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 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 K. Liu 5 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 6, 4 F. Touchard 4 L. Vacavant 4 R. Wolff 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
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 CC-IN2P3 - Centre de Calcul de l'IN2P3
4 CPPM - Centre de Physique des Particules de Marseille
5 USC - University of Southern California
6 Wigner Research Centre for Physics [Budapest]
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
Abstract : Measurements of top quark spin observables in $t\bar{t}$ events are presented based on 20.2 fb$^{-1}$ of $\sqrt{s} = 8$ TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of $t\bar{t}$ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.
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Journal articles
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http://hal.in2p3.fr/in2p3-01431223
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Submitted on : Tuesday, January 10, 2017 - 3:59:30 PM
Last modification on : Tuesday, November 26, 2019 - 4:12:08 PM

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M. Aaboud, N. Berger, A.M. Burger, M. Delmastro, L. Di Ciaccio, et al.. Measurements of top quark spin observables in $t\bar{t}$ events using dilepton final states in $\sqrt{s} = 8$ TeV $pp$ collisions with the ATLAS detector. Journal of High Energy Physics, Springer Verlag (Germany), 2017, 03, pp.113. ⟨10.1007/JHEP03(2017)113⟩. ⟨in2p3-01431223⟩

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