https://arxiv.org/abs/2502.18175
Muon-decay parameters from COHERENT
Víctor Bresó-Pla, Sergio Cruz-Alzaga, Martín González-Alonso, Suraj Prakash
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 ν¯μ energy distribution. We also discuss future sensitivities and assess the implications for the Lorentz structure of the interactions mediating muon decay.
We have been invited to give a parallel talk at Neutrino Telescopes in Padova, at the end of September/beginning of October.
https://agenda.infn.it/event/44606/overview
If anyone is interested in attending, we would have to submit an abstract (deadline is June 16). Parallel talks should be 15’ + questions. Alternatively there is the possibility to present a poster.
The neutrinos from STORed Muons (nuSTORM) facility
The neutrinos from STORed Muons (nuSTORM) facility enables precise neutrino physics studies through the use of innovative neutrino beams created by muon decay, which is characterised by well-defined flavour composition and energy spectra of the neutrino beam. Combined with precise muon flux measurements, with a final target of \%-level precision in neutrino flux determination, this will facilitate a diverse research program probing fundamental neutrino properties.
The facility uses a race-track-like storage ring to store muons with momenta tunable between 1 and 6 GeV/c, enabling precise measurements of $\nu-A$ scattering for both, $\nu_{\mu}$ and $\nu_{e}$ over energy ranges relevant for long-baseline experiments. It also allows for highly sensitive searches for exotic processes and studies of short-baseline flavour transitions exceeding the reach of already planned experiments. As a technology test-bed for high-brightness muon beams, nuSTORM is on the path towards a multi-TeV muon collider and could be part of a test-facility serving a muon-cooling demonstrator.
This talk will present the current status of nuSTORM and its physics capabilities. It will also include results from a FLUKA-based Bayesian optimization study aimed at enhancing the neutrino flux by improving pion capture through optimized target and horn geometries at different pion momentum settings.
