Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716376.0, MPI für Physik / YB 2016
Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\\sqrt{s}=7$TeV using the ATLAS detector
Authors:ATLAS Collaboration
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:93
Start Page:012002
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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 4.6fb$^{-1}$ 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 $\\theta_1$ and $\\theta_2$ 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 {\\mbox{$\\cos\\theta_1\\cdot\\cos\\theta_2$}} 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.
Classification / Thesaurus:ATLAS
Comment of the Author/Creator:17 pages (+ author list: 34 pages in total), 2 figures, 4 tabels. Submitted to: Phys. Rev. D. RC. All figures including auxiliary figures are available at: href{https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-10/}{this https URL}
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
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