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Prospects for P and CP violation in Λc+ decays with a polarized beam at the Super Tau-Charm Facility

Hong-Jian Wang1,2, Cheng Wang1,2, Hao Sun3, Pei-Rong Li1,2,*, Xiao-Rui Lyu3,†, and Rong-Gang Ping4,3,‡

  • *Contact author: prli@lzu.edu.cn
  • †Contact author: xiaorui@ucas.ac.cn
  • ‡Contact author: pingrg@ihep.ac.cn
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Phys. Rev. D 112, 112002 – Published 1 December, 2025

DOI: https://doi.org/10.1103/6pdw-trsj

Abstract

Weak decays of the charmed baryons offer an ideal platform to study parity (P) and charge conjugation-parity (CP) violation in the quark sector, to stringently test the Standard Model and search for new physics. It is a key goal in the next-generation positron-electron collider, such as the Super Tau-Charm Facility (STCF). Thanks to the quantum-entangled pair production with superhigh luminosity and the possibility of beam polarization, STCF provides a unique environment to probe such symmetry violations with unprecedented sensitivity. In this paper, we evaluate the precisions of the P-violating parameters and subsequently obtain the expected sensitivity of the CP-violating parameters in charmed baryon decays of Λc+→pπ0, pη, ΛK+, Σ0K+, and Σ+KS0, regarding to different polarization setups in STCF. The study suggests that the implementation of longitudinal beam polarization in STCF would greatly enhance the experimental capability in studying P and CP violation.

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Phys. Rev. D 112, 112002– Published 1 December, 2025
  • Received 16 August 2025
  • Accepted 12 November 2025
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