Search for <i>CP</i> violation and observation of <i>P</i> violation in Λ<i><sub>b</sub></i><SUP>0</SUP> → <i>p</i>π<SUP>-</SUP> π<SUP>+</SUP> π<SUP>-</SUP> decays



Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 895 more authors) (2020) Search for <i>CP</i> violation and observation of <i>P</i> violation in Λ<i><sub>b</sub></i><SUP>0</SUP> → <i>p</i>π<SUP>-</SUP> π<SUP>+</SUP> π<SUP>-</SUP> decays. PHYSICAL REVIEW D, 102 (5). 051101-.

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Abstract

A search for $C\!P$ violation in the $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decay is performed using LHCb data corresponding to an integrated luminosity of 6.6$\,fb^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8 and 13$\,Te\kern -0.1em V$. The analysis uses both triple product asymmetries and the unbinned energy test method. The highest significances of $C\!P$ asymmetry are 2.9 standard deviations from triple product asymmetries and 3.0 standard deviations for the energy test method. Once the global $p$-value is considered, all results are consistent with no $C\!P$ violation. Parity violation is observed at a significance of $5.5$ standard deviations for the triple product asymmetry method and $5.3$ standard deviations for the energy test method.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-028.html (LHCb public pages)
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 01 Oct 2020 08:59
Last Modified: 17 Oct 2023 11:16
DOI: 10.1103/PhysRevD.102.051101
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3103126