What type of study is this?

This is a Quantitative Study study.

September 24, 2025Open Access

Prospects for P and C\!P violation in Λ₂^+ decays with polarized beam at Super Tau-Charm Facility

HWHongjian WangState Key Laboratory of Remote Sensing Science CWCheng WangTongji University HSHao SunInner Mongolia Agricultural University

Key Points

Implementing beam polarization at STCF significantly enhances the sensitivity to P and CP violation.
Evaluating $P$-violating parameters in charmed baryon decays provides critical insights into the Standard Model.
The study highlights how quantum-entangled pair production could improve the precision of experimental results.
Charmed baryon decays such as $Λ_{c}^{+} o pπ^0$ are key to probing fundamental symmetries in particle physics.

Abstract

Weak decays of the charmed baryons offer an ideal platform to study parity (P) and charge conjugation-parity (C\!P) violation in 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 super high 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 Λ₂^+ pπ⁰, pη, ΛK^+, Σ⁰ K^+, and Σ^+ K⁰S, 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.

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