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

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 101, 012006 – Published 21 January 2020
Physics logo See Viewpoint: CP Violations Newly Observed in Beauty Meson Decays
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Abstract

The results of an amplitude analysis of the charmless three-body decay B+π+π+π, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3fb1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+πS-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+π P-wave, the f2(1270) resonance in the π+π D-wave, and the ρ3(1690)0 resonance in the π+π F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+π+π+π decays.

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  • Received 16 September 2019

DOI:https://doi.org/10.1103/PhysRevD.101.012006

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

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

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 124, 031801 (2020)

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Vol. 101, Iss. 1 — 1 January 2020

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