Search for $CP$ violation and observation of $P$ violation in $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays

Aaij, Roel; Abellán Beteta, Carlos; Ackernley, Thomas; Adeva, Bernardo; Adinolfi, Marco; Afsharnia, Hossein; Aidala, Christine Angela; Aiola, Salvatore; Ajaltouni, Ziad; Akar, Simon

doi:10.1103/PhysRevD.102.051101

Search for $CP$ violation and observation of $P$ violation in $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays

LHCb

Collaboration

Dec 23, 2019

12 pages

Published in:

Phys.Rev.D 102 (2020) 5, 051101

Published: Sep 9, 2020

e-Print:

1912.10741 [hep-ex]

DOI:

10.1103/PhysRevD.102.051101

PDG: a

_{P}({{\mathit \Lambda}_{{{b}}}^{0}}

\rightarrow

{{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

)

Report number:

LHCB-PAPER-2019-028,
CERN-EP-2019-256

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (APS)

A search for CP violation in the Λb0→pπ-π+π- decay is performed using LHCb data corresponding to an integrated luminosity of 6.6 fb-1 collected in pp collisions at center-of-mass energies of 7, 8 and 13 TeV. The analysis uses both triple product asymmetries and the unbinned energy test method. The highest significances of CP 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 CP 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. The reported deviations are given in regions of phase space.

Note:

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)

p p: colliding beams
parity: violation
p p: scattering
Lambda/b0: hadronic decay
asymmetry: CP
CP: violation
LHC-B
CERN LHC Coll
data analysis method
experimental results

References(35)

Figures(3)

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