New Signature of low mass $Z^\prime$ in $J/\psi$ decays

TL;DR

This paper proposes a novel method to detect a low-mass, generation-independent, leptophobic $Z'$ boson via parity-violating effects in specific $J/ au$ decays, with simulations indicating improved experimental sensitivity at BESIII and STCF.

Contribution

It introduces a new approach to search for low-mass $Z'$ particles through parity violation in $J/ au$ decays, providing predictions for experimental detection and constraints.

Findings

Significant enhancement in lower limit estimation of $eta_{NP}$ with STCF.

Null results would constrain $Z'$-quark couplings to around $10^{-2}$.

Monte Carlo simulations support feasibility at BESIII and STCF.

Abstract

We explore a new approach to search for a low-mass $Z^{\prime}$ particle through $J/\psi$ decays by identifying its existence through parity-violating phenomena in the isospin-violating final states of $\Lambda\overline{\Sigma}^{0}$ and the corresponding charge conjugated states of $\overline{\Lambda}\Sigma^{0}$. Our investigation centers on a generation-independent and leptophobic $Z^{\prime}$ with its mass below 10 GeV. Given the present experimental conditions at the Beijing Spectrometer III~(BESIII) and the anticipated opportunities at the Super Tau Charm Factory~(STCF), we conduct Monte-Carlo simulations to predict possible events at both facilities. Notably, we foresee a substantial enhancement in the precision of the lower limit estimation of $\alpha_{\text{NP}}$ as well as a reduction in statistical uncertainty with upcoming STCF experiments. Furthermore, it is essential to highlight that a null result in the measurement of $\alpha_{\text{NP}}$ would impose stringent constraints, requiring the $Z^{\prime}-q-q$ couplings to be on the order of $10^{-2}$.