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

CMS Collaboration

doi:10.1103/PhysRevD.97.072010

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

CMS Collaboration

Research output: Contribution to journal › Article › Research › peer-review

26 Citations (Scopus)

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.

Original language	English
Article number	072010
Number of pages	20
Journal	Physical Review D
Volume	97
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.97.072010
Publication status	Published - 2018
Externally published	Yes

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10.1103/PhysRevD.97.072010

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Cite this

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title = "Measurement of the Λb polarization and angular parameters in Λb →j /ψ Λ decays from pp collisions at √s=7 and 8 TeV",

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. ",

author = "Jordan Nash and {CMS Collaboration}",

year = "2018",

doi = "10.1103/PhysRevD.97.072010",

language = "English",

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journal = "Physical Review D",

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AB - 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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DO - 10.1103/PhysRevD.97.072010

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