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arXiv · 2606.05406

Muon-induced di-tau production as a probe of new physics

Sudipta Das·Luke Kupari·Mary Hall Reno·Sebastian Trojanowski
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Abstract

The muon trident process, which involves coherent scattering to produce tau pairs, is a powerful tool for constraining dark sectors. We propose to explore this channel using future high-energy muon beams with the dedicated active-target detector, High-Energy Muon Electronic Research Apparatus (HEMERA). The detector would complement muon beam-dump searches by resolving prompt signatures and could operate from preparatory facilities involving an individual muon beam of the full Muon Collider. We illustrate its capabilities for a leptophilic scalar with Yukawa-like couplings that can mediate thermal dark matter production. With $10^{18}$ incident TeV-scale muons, even a compact 10 kg silicon-based HEMERA will extend current $B$-factory and $(g-2)_\mu$ bounds by over an order of magnitude in coupling strength. In the leptophilic thermal dark matter paradigm, this search offers a way to probe dark sector targets beyond the neutrino floor of dark matter direct detection. This provides an additional compelling motivation for the development of high-energy muon beam infrastructure.

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Sudipta Das, Luke Kupari, Mary Hall Reno, Sebastian Trojanowski. 2026-06-03. Muon-induced di-tau production as a probe of new physics. https://arxiv.org/abs/2606.05406

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