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Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at √s=8 TeV with the ATLAS detector
ATLA Collaboration
Hara, K.
原, 和彦
ハラ, カズヒコ
Kim, S. H.
金 , 信弘
キム, シンホン
Okawa, H.
大川, 英希
オオカワ, ヒデキ
Sato, K.
佐藤, 構二
サトウ, コウジ
Ukegawa, F.
受川, 史彦
ウケガワ, フミヒコ
Measurements of the top-antitop quark pair production charge asymmetry in the dilepton channel, characterized by two high-pT leptons (electrons or muons), are presented using data corresponding to an integrated luminosity of 20.3 fb^-1 from pp collisions at a center-of-mass energy s√=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the tt ̄ system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: AllC based on the selected leptons and Att ̄C based on the reconstructed tt ̄ final state. The inclusive asymmetries are measured in the full phase space to be AllC=0.008±0.006 and Att ̄C=0.021±0.016, which are in agreement with the Standard Model predictions of AllC=0.0064±0.0003 and Att ̄C=0.0111±0.0004.
journal article
American Physical Society
2016-08
application/pdf
Physical review D
3
94
032006
2470-0010
AA00773624
https://tsukuba.repo.nii.ac.jp/record/39905/files/PRD_94-3-032006.pdf
eng
https://doi.org/10.1103/PhysRevD.94.032006
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
(c) 2016 CERN, for the ATLAS Collaboration
open access