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Title: Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at $$\sqrt{s}$$ = 7 TeV using the ATLAS detector

A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and $$\bar{t}$$ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb$$^{-1}$$ at a center-of-mass energy of $$\sqrt{s}$$ = 7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ$$_1$$ and θ$$_2$$ between the charged leptons and the direction of motion of the parent quarks in the $$t\bar{t}$$ rest frame are sensitive to the spin information, and the distribution of cosθ$$_1$$ ∙ cosθ$$_2$$ is sensitive to the spin correlation between the t and $$\bar{t}$$ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.
Authors:
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  1. et al.
Publication Date:
OSTI Identifier:
1246820
Report Number(s):
BNL--112034-2016-JA
Journal ID: ISSN 2470-0010; KA1101021
DOE Contract Number:
SC00112704
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 93
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS