Measurement of the Λb Polarization and Angular Parameters in Λb→J/ψΛ Decays from Pp Collisions at √s = 7 and 8 TeV
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PhysRevD.97.072010.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
April 2018
Journal
Physical Review D
Citation
Sirunyan, A. M. et al. “Measurement of the Λb Polarization and Angular Parameters in Λb→J/ψΛ Decays from Pp Collisions at √s = 7 and 8 TeV.” Physical Review D 97, 7 (April 2018): 072010 © 2018 CERN, for the CMS Collaboration
Version
Final published version
Abstract
An analysis of the bottom baryon decay Λb→J/ψ(→μ+μ−)Λ(→pπ−) is performed to measure the Λb 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 Λb 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.97.072010
