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  • Featured in Physics
  • Letter
  • Open Access

Possible large CP violation in charmed Λb decays

Yin-Fa Shen1,*, Jian-Peng Wang2,†, and Qin Qin1,‡

  • 1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

  • *syf70280@hust.edu.cn
  • †Corresponding author: wangjp20@lzu.edu.cn
  • ‡Corresponding author: qqin@hust.edu.cn
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Phys. Rev. D 108, L111901 – Published 7 December, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L111901

Abstract

We propose that the cascade decay Λb→D(→K+π−)N(→pπ−) may serve as the discovery channel for baryonic CP violation. This decay chain is contributed by, dominantly, the amplitudes with the intermediate D state as D0 or D¯0. The large weak phase between the two kinds of amplitudes suggests the possibility of significant CP violation. While the presence of undetermined strong phases may complicate the dependence of CP asymmetry, our phenomenological analysis demonstrates that CP violation remains prominent across a broad range of strong phases. The mechanism also applies to similar decay modes such as Λb→D(→K+K−)Λ. Considering the anticipated luminosity of LHCb, we conclude that these decay channels offer a promising opportunity to uncover CP violation in the baryon sector.

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synopsis

Symmetry Violation Predicted for Bottom-Containing Baryon

Published 7 December, 2023

Researchers predict a large “CP” violation for the decay of a baryon that contains a bottom quark, a finding that has implications for how physicists understand the Universe.

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Phys. Rev. D 108, L111901– Published 7 December, 2023
  • Received 25 September 2023
  • Accepted 1 November 2023
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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.

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