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

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

CMS Collaboration; Sirunyan, A. M.; CHAUHAN, S.; DUBE, SOURABH; HEGDE, V.; KAPOOR, A.; KOTHEKAR, K.; PANDEY, S.; RANE, A.; SHARMA, SEEMA et al.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3903
https://doi.org/10.1103/PhysRevD.97.072010
Date: 2018-04


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.

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