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<p>We study the phenomenology of a sub-GeV <i>L</i><sub><i>μ</i></sub> − <i>L</i><sub><i>τ</i></sub> gauge boson. We find discrepancies with existing literature in sensitivity projections for the upcoming SHiP experiment and in the treatment of supernovae cooling constraints. We present a quantitative analysis of different production modes in beam dumps and compare our results to previous work. In the context of supernovae, we re-evaluate the standard supernova cooling bounds from SN1987A and analyze additional supernova-based probes: diffusive cooling, constraints from the existence of low-energy supernovae, and the absence of a high-energy neutrino signal from SN1987A.</p>

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Lμ − Lτ gauge bosons in beam dumps and supernovae

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Nikita Blinov,
  • Patrick J. Fox,
  • Kevin J. Kelly,
  • Ryan Plestid,
  • Tao Zhou

摘要

We study the phenomenology of a sub-GeV Lμ − Lτ gauge boson. We find discrepancies with existing literature in sensitivity projections for the upcoming SHiP experiment and in the treatment of supernovae cooling constraints. We present a quantitative analysis of different production modes in beam dumps and compare our results to previous work. In the context of supernovae, we re-evaluate the standard supernova cooling bounds from SN1987A and analyze additional supernova-based probes: diffusive cooling, constraints from the existence of low-energy supernovae, and the absence of a high-energy neutrino signal from SN1987A.