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Muon-Decay Parameters from COHERENT.

Víctor Bresó-Pla1, Sergio Cruz-Alzaga2, Martín González-Alonso2

  • 1Universität Heidelberg, Institute for Theoretical Physics, 69120 Heidelberg, Germany.

Physical Review Letters
|October 12, 2025
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Summary
This summary is machine-generated.

Coherent elastic neutrino-nucleus scattering measurements offer new insights into muon decay physics. This study provides the first direct constraint on Michel parameters from COHERENT data, advancing neutrino physics.

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Area of Science:

  • Particle Physics
  • Nuclear Physics
  • Neutrino Physics

Background:

  • Muon decay is a fundamental process in particle physics.
  • Understanding the energy distribution of neutrinos from muon decay is crucial.
  • Spallation sources provide unique opportunities for neutrino measurements.

Purpose of the Study:

  • To demonstrate the value of coherent elastic neutrino-nucleus scattering (CEνNS) measurements at spallation sources for probing muon decay.
  • To derive the first direct constraint on Michel parameters using COHERENT data.
  • To explore future sensitivities and implications for Lorentz structure.

Main Methods:

  • Utilizing data from the COHERENT experiment.
  • Analyzing coherent elastic neutrino-nucleus scattering events.
  • Applying measurements to constrain parameters governing neutrino energy distributions.

Main Results:

  • CEνNS measurements at spallation sources are effective probes of muon decay.
  • The first direct constraint on Michel parameters for muon decay has been derived.
  • Future sensitivities and implications for Lorentz structure are discussed.

Conclusions:

  • CEνNS measurements provide a novel and powerful tool for studying muon decay.
  • The findings offer direct insights into the fundamental interactions of muon decay.
  • The method is applicable to other neutrino production mechanisms, such as pion decay.