Measurement of the ?b polarization and angular parameters in ?b ?j /? ? decays from pp collisions at s =7 and 8 TeV MEASUREMENT of the ?b POLARIZATION ? A. M. SIRUNYAN et al.
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2018
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Abstract
An analysis of the bottom baryon decay ?b?J/?(??+?-)?(?p?-) is performed to measure the ?b polarization and three angular parameters in data from pp collisions at s=7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The ?b polarization is measured to be 0.00�0.06(stat)�0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14�0.14(stat)�0.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics. � 2018 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the �https://creativecommons.org/licenses/by/4.0/� Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
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