Prospects for P and C P violation in Λ_c⁺ decays with polarized beam at Super Tau-Charm Facility

2025/08/17 by Wang, Hong-Jian, Wang, Cheng, Sun, Hao +3
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2508.12217

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 Λ_c⁺→ pπ⁰, pη, ΛK⁺, Σ⁰ K⁺, and Σ⁺ K⁰_S, 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.

Citations

• Charmed baryon decays: SU(3)_F breaking and CP violation
• CP Violation in Hadronic Weak Decays of Charmed Baryons in the Topological Diagrammatic Approach
• Large CP violation in charmed baryon decays
• Topological Diagrams and Hadronic Weak Decays of Charmed Baryons

Related

• CP violation studies at Super Tau-Charm Facility
• Study of parity violation in Λ_c⁺→ϕp and Λ_c⁺ → ωp decays
• The Production and Decay Dynamics of the Charmed Baryon Λ_c⁺ in e⁺e^- Annihilations near Threshold
• Determination of the sensitivity of Λ and Λ⁺_c electric dipole moments using a full angular analysis
• Tests at a Tau/Charm Factory with Longitudinally Polarized Beams