# Neutrino, Electroweak and Nuclear Physics from COHERENT Elastic Neutrino-Nucleus Scattering with a New Quenching Factor

## TL;DR

This paper reanalyzes COHERENT experiment data with a new quenching factor, improving measurements of neutron distributions, weak mixing angle, and neutrino properties, including charge radii and magnetic moments, with new constraints on neutrino charges.

## Contribution

It provides the first constraints on neutrino charges from coherent scattering data and refines measurements of nuclear and neutrino properties using updated analysis techniques.

## Key findings

- Better determination of neutron distribution radii for Cs and I.
- Evidence of nuclear coherence suppression at 3.7σ.
- New constraints on neutrino charge radii and magnetic moments.

## Abstract

We present an updated analysis of the coherent neutrino-nucleus elastic scattering data of the COHERENT experiment taking into account the new quenching factor published recently in Phys. Rev. D100, 033003 (2019). Through a fit of the COHERENT time-integrated energy spectrum, we show that the new quenching factor leads to a better determination of the average rms radius of the neutron distributions of $^{133}\text{Cs}$ and $^{127}\text{I}$, while in combination with the atomic parity violation (APV) experimental results it allows to determine a data-driven APV measurement of the low-energy weak mixing angle in very good agreement with the Standard Model prediction. We also find a $3.7\sigma$ evidence of the suppression of coherence due to the nuclear structure. Neutrino properties are better constrained by considering the COHERENT time-dependent spectral data, that allow us to improve the bounds on the neutrino charge radii and magnetic moments. We also present for the first time constraints on the neutrino charges obtained with coherent neutrino-nucleus elastic scattering data. In particular, we obtain the first laboratory constraints on the diagonal charge of $\nu_{\mu}$ and the $\nu_{\mu}$-$\nu_{\tau}$ transition charge.