Prospects for P and C P violation in Λ c + decays with a polarized beam at the Super Tau-Charm Facility
Year: 2025
Type: article
Abstract: Weak decays of the charmed baryons offer an ideal platform to study parity ( P ) and charge conjugation-parity ( C P ) 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 C P -violating parameters in charmed baryon decays of Λ c + → p π 0 , p η , Λ K + , Σ 0 K + , and Σ + K S 0 , 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 C P violation.
DOI: 10.1103/6pdw-trsj
Authors: Hong-Jian Wang, Cheng Wang, Hao Sun, Pei-Rong Li, Xiao-Rui Lyu, Rong-Gang Ping
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Institute of Energy, Hefei Comprehensive National Science Center, Lanzhou University, National Natural Science Foundation of China, Chinese Academy of Sciences, University of Chinese Academy of Sciences, National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities
OpenAlex ID: W4416937980