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

Aad, G.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Affolder, A. A.; Agatonovic-Jovin, T.

doi:10.1103/PhysRevD.93.012002

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

Journal Article · Wed Jan 13 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.012002· OSTI ID:1246820

Aad, G.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Affolder, A. A.; Agatonovic-Jovin, T. ^[1]

et al.

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: ATLAS Collaboration

DOE Contract Number:: SC00112704

OSTI ID:: 1246820

Report Number(s):: BNL-112034-2016-JA; KA1101021

Journal Information:: Physical Review D, Vol. 93; ISSN 2470-0010

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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