We demonstrate that measurements of Coherent Elastic Neutrino-Nucleus Scattering (CEνNS) at spallation sources are valuable probes of muon-decay physics. Using COHERENT data we derive the first direct constraint on the Michel parameters governing the νˉμ energy distribution. We also discuss future sensitivities, the implications for the Lorentz structure of the interactions mediating muon decay and the application to other neutrino-production mechanisms like pion decay.
@article{arxiv.2502.18175,
title = {Muon-Decay Parameters from COHERENT},
author = {Víctor Bresó-Pla and Sergio Cruz-Alzaga and Martín González-Alonso and Suraj Prakash},
journal= {arXiv preprint arXiv:2502.18175},
year = {2025}
}
Comments
6 pages, 3 figures. Matches the published version; new section added on pion decay