par Khachatryan, Vardan;Barria, Patrizia
;Brun, Hugues
;Caillol, Cécile
;Clerbaux, Barbara
;De Lentdecker, Gilles
;Fasanella, Giuseppe
;Favart, Laurent
;Grebenyuk, Anastasia
;Karapostoli, Georgia
;Lenzi, Thomas
;Leonard, Alexandra;Maerschalk, Thierry
;Marinov, Audrey
;Pernie, Luca
;Randle-Conde, Aidan Sean
;Seva, Tomislav
;Vander Velde, Catherine
;Vanlaer, Pascal
;Yonamine, Ryo
;Zenoni, Florian
;Zhang, Fengwangdong
; [et al.]
Référence The Journal of high energy physics, 2016, 4, 73
Publication Publié, 2016




















Référence The Journal of high energy physics, 2016, 4, 73
Publication Publié, 2016
Article révisé par les pairs
Résumé : | A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 ± 0.03(stat) ± 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44. |