Prospects of $CP$ violation in $\Lambda$ decay with polarized electron beam at STCF

Abstract

Based on $1.89\times 10^8$ $J/\psi \to \Lambda \bar{\Lambda }$ Monte Carlo (MC) events produced from a longitudinally-polarized electron beam, the sensitivity of $CP$ violation of $\Lambda$ decay is studied with fast simulation software. In addition, the $J/\psi \to \Lambda \bar{\Lambda }$ decay can also be used as a process to optimize the detector response using the interface provided by the fast simulation software. In the future, STCF is expected to obtain 3.4 trillion $J/\psi$ events, and the statistical sensitivity of $CP$ violation of $\Lambda$ decay via $J/\psi \to \Lambda \bar{\Lambda }$ process is expected to reach $\mathcal{O}$~$(10^{-5})$ when the electron beam polarization is 80\%.

References in corpus (5)

• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/\psi \to \gamma \eta {\eta }^{\prime }$
• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• Direct CP violation in beauty and charm hadron decays
• A fast simulation package for STCF detector

Cited by in corpus (3)

• Production and decay of hyperons in a transversely polarized electron-positron collider
• Prospects for $P$ and $CP$ violation in ${\Lambda }_c^{+}$ decays with polarized beam at Super Tau-Charm Facility
• New Signature of low mass $Z^{\prime }$ in $J/\psi$ decays