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Observation of Several Sources of CP Violation in B+π+π+π Decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 124, 031801 – Published 21 January 2020
Physics logo See Viewpoint: CP Violations Newly Observed in Beauty Meson Decays

Abstract

Observations are reported of different sources of CP violation from an amplitude analysis of B+π+π+π decays, based on a data sample corresponding to an integrated luminosity of 3fb1 of pp collisions recorded with the LHCb detector. A large CP asymmetry is observed in the decay amplitude involving the tensor f2(1270) resonance, and in addition significant CP violation is found in the π+πS wave at low invariant mass. The presence of CP violation related to interference between the π+πS wave and the P wave B+ρ(770)0π+ amplitude is also established; this causes large local asymmetries but cancels when integrated over the phase space of the decay. The results provide both qualitative and quantitative new insights into CP -violation effects in hadronic B decays.

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  • Received 16 September 2019

DOI:https://doi.org/10.1103/PhysRevLett.124.031801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2020 CERN, for the LHCb Collaboration

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
  1. Properties
Particles & Fields

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CP Violations Newly Observed in Beauty Meson Decays

Published 21 January 2020

Measurements show large matter-versus-antimatter differences in three-pion decays of B mesons, yielding new insights into the strong interaction dynamics that control these decays.

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See Also

Amplitude analysis of the B+π+π+π decay

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 101, 012006 (2020)

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Vol. 124, Iss. 3 — 24 January 2020

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