Measurement of the Lambda(b) polarization and angular parameters in Lambda(b) -> J/psi Lambda decays from pp collisions at root s=7 and 8 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Measurement of the Lambda(b) polarization and angular parameters in Lambda(b) -> J/psi Lambda decays from pp collisions at root s=7 and 8 TeV. Physical Review D, 97 (7). pp. 1-20. ISSN 2470-0010 E-ISSN 2470-0029

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Abstract

An analysis of the bottom baryon decay Λb → J=ψð→ μþμ−ÞΛð→ pπ−Þ is performed to measure the Λb polarization and three angular parameters in data from pp collisions at ffiffi s p ¼ 7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Λb polarization is measured to be 0.00 0.06ðstatÞ 0.06ðsystÞ and the parity-violating asymmetry parameter is determined to be 0.14 0.14ðstatÞ 0.10ðsystÞ. The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.

Item Type:	Article (Journal)
Additional Information:	7861/70460
Uncontrolled Keywords:	Λb polarization and angular parameters; Λb → J=ψΛ decays; pp collisions at ffiffi s p = 7 and 8 TeV
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	04 Feb 2019 10:03
Last Modified:	15 Jul 2019 09:31
URI:	http://irep.iium.edu.my/id/eprint/70460

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