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

The CMS Collaboration

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An analysis of the bottom baryon decay Λb→ J/ψ(→ μ+μ-)Λ(→ pπ-) is performed to measure the Λbpolarization and three angular parameters in data from pp collisions at √s = 7 and 8 TeV, collected by the CMS experiment at the LHC. The Λbpolarization 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 languageEnglish (US)
JournalUnknown Journal
StatePublished - Feb 13 2018

ASJC Scopus subject areas

  • General

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