Prospects for exploring New Physics in Coherent Elastic Neutrino-Nucleus Scattering

TL;DR

This paper explores how upcoming low-threshold CE$ u$NS experiments can significantly advance the search for new physics beyond the Standard Model, including neutrino magnetic moments, non-standard interactions, and new mediators.

Contribution

It demonstrates the potential of low-threshold CE$ u$NS measurements to improve constraints on new physics parameters by two orders of magnitude, using multiple detector targets.

Findings

Enhanced sensitivity to neutrino magnetic moments.

Stronger constraints on non-standard interactions.

Improved limits on new massive mediators.

Abstract

Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS) is a Standard Model process that, although predicted for decades, has only been detected recently by the COHERENT collaboration. Now that CE$\nu$NS has been discovered, it provides a new probe for physics beyond the Standard Model. We study the potential to probe New Physics with CE$\nu$NS through the use of low temperature bolometers at a reactor source. We consider contributions to CE$\nu$NS due to a neutrino magnetic moment (NMM), Non-Standard Interactions (NSI) that may or may not change flavor, and simplified models containing a massive scalar or vector mediator. Targets consisting of Ge, Zn, Si, CaWO$_4$, and Al$_2$O$_3$ are examined. We show that by reaching a percentage-level precision measurement on the CE$\nu$NS energy spectrum down to $\mathcal{O}(10)$ eV, forthcoming experiments will improve by two orders of magnitude both the CE$\nu$NS-based NMM limit and the search for new massive mediators. Additionally, we demonstrate that such dedicated low-threshold CE$\nu$NS experiments will lead to unprecedented constraints on NSI parameters (particularly when multiple targets are combined) which will have major implications for the global neutrino physics program.