Prospects for $P$ and $CP$ violation in ${\Lambda }_c^{+}$ decays with polarized beam at Super Tau-Charm Facility

Abstract

Weak decays of the charmed baryons offer an ideal platform to study parity ($P$) and charge conjugation-parity ($CP$) 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 $CP$-violating parameters in charmed baryon decays of ${\Lambda }_c^{+}\to p{\pi }^0$, $p\eta$, $\Lambda K^{+}$, ${\Sigma }^0{K}^{+}$, and ${\Sigma }^{+}{K}_S^0$, 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 $CP$ violation.

References in corpus (20)

• Observation of $CP$ violation in charm decays
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Observation of charge-parity symmetry breaking in baryon decays
• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• Search for $CP$ violation and measurement of branching fractions and decay asymmetry parameters for ${\Lambda }_c^{+}\to \Lambda h^{+}$ and ${\Lambda }_c^{+}\to {\Sigma }^0{h}^{+}$ ($h=K,\pi$)
• Design and Development of the Core Software for STCF Offline Data Processing
• Partial wave analysis of the charmed baryon hadronic decay ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}{\pi }^0$
• First Measurement of the Decay Asymmetry in the pure W-boson-exchange Decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$
• CP Violation of Baryon Decays with $N\pi$ Scatterings
• Measurement of the Branching Fraction of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to \Lambda K^{+}$
• Production and decay of hyperons in a transversely polarized electron-positron collider
• Charmed baryon decay asymmetry in e+e- annihilation
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}$ and ${\Sigma }^{+}{K}_S^0$
• Measurement of the branching fractions of the singly Cabibbo-suppressed decays ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p\omega$
• Experimental overview on the charmed baryon decays
• Prospects of $CP$ violation in $\Lambda$ decay with polarized electron beam at STCF
• Charm Physics at the Super $\tau$-Charm Factory
• Large CP violation in charmed baryon decays
• Sensitivity study of the charged lepton flavor violating process $\tau \to \gamma \mu$ at STCF