Measurement of the Λb polarization and angular parameters in Λb →j /ψ Λ decays from pp collisions at s =7 and 8 TeV MEASUREMENT of the Λb POLARIZATION ⋯ A. M. SIRUNYAN et al.

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 Λb polarization and angular parameters in Λb →j /ψ Λ decays from pp collisions at s =7 and 8 TeV MEASUREMENT of the Λb POLARIZATION ⋯ A. M. SIRUNYAN et al. Physical Review D, 97 (7). pp. 1-19. 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:	7861/65579
Uncontrolled Keywords:	Λb polarization; Angular parameters; Λb → J=ψΛ decays; pp collisions
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:	09 Aug 2018 13:02
Last Modified:	11 Apr 2019 17:02
URI:	http://irep.iium.edu.my/id/eprint/65579

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