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arXiv · 2309.11066

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

Chao-Qiang Geng·Chia-Wei Liu·Jiabao Zhang
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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 $10^{-2}$.

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Chao-Qiang Geng, Chia-Wei Liu, Jiabao Zhang. 2023-09-20. New Signature of low mass $Z^\prime$ in $J/\psi$ decays. https://doi.org/10.1088/1674-1137%2Fad53b6

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