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Polarization probes of new physics in lepton-flavor-violating hyperon production from e−N→τ−Y scattering

Xin-Shuai Yan1,*, Zhen-Qing Hu1,†, Qin Chang1,‡, and Ya-Dong Yang1,2,§

  • *Contact author: yanxinshuai@htu.edu.cn
  • †Contact author: huzhenqing@stu.htu.edu.cn
  • ‡Contact author: changqin@htu.edu.cn
  • §Contact author: yangyd@mail.ccnu.edu.cn
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Phys. Rev. D 112, 055026 – Published 18 September, 2025

DOI: https://doi.org/10.1103/w23y-y8mn

Abstract

While charged lepton-flavor-violating tau decays to strange mesons provide powerful probes of the underlying τ→ℓds¯ transition, the corresponding decay modes involving hyperons are kinematically forbidden. To address this gap, we propose the quasielastic scattering processes e−N→τ−Y. Within a general low-energy effective Lagrangian, we perform a comprehensive analysis of the final-state polarizations of both the τ lepton and the hyperon Y, systematically addressing the theoretical uncertainty driven by the model dependence of form factors. Our analysis demonstrates that while this uncertainty leads to large variations in predicted rates, the polarization observables can potentially distinguish between the form factor models, and help to determine the chiral nature of the vectorial new physics interaction. Finally, we forecast the event rates for future facilities, revealing a strong dependence on the form factor models, with predicted yields ranging from potentially observable levels to rates far below current detection thresholds.

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Phys. Rev. D 112, 055026– Published 18 September, 2025
  • Received 12 July 2025
  • Accepted 13 August 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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