• Open Access

Measurement of the Λb polarization and angular parameters in ΛbJ/ψΛ decays from pp collisions at s=7 and 8 TeV

A. M. Sirunyan et al. (CMS Collaboration)
Phys. Rev. D 97, 072010 – Published 17 April 2018

Abstract

An analysis of the bottom baryon decay ΛbJ/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.

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  • Received 13 February 2018

DOI:https://doi.org/10.1103/PhysRevD.97.072010

Published by the American Physical Society under the terms of the 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.

© 2018 CERN, for the CMS Collaboration

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Vol. 97, Iss. 7 — 1 April 2018

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