Measurements of t[bar over t] Spin Correlations and Top-Quark Polarization Using Dilepton Final States in pp Collisions at √s = 7 TEV
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Chatrchyan-2014-Measurements of tt spin correlations.pdf
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Author(s)
Apyan, Aram
Barbieri, Riccardo
Bauer, Gerry P.
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Dutta, V.
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Date Issued
May 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurements of t[bar over t] Spin Correlations and Top-Quark Polarization Using Dilepton Final States in pp Collisions at √s = 7 TEV.” Physical Review Letters 112, no. 18 (May 2014).
Version
Final published version
Abstract
Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in pp collisions at the LHC at √s = 7 TeV. The data correspond to an integrated luminosity of 5.0 fb[superscript −1] collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.112.182001
