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.
Highlights
Coherent elastic neutrino-nucleus scattering is a new powerful tool that allows us to probe neutrino, electroweak, and nuclear physics, after its first, and so far only, observation in the COHERENT experiment [1]
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 133Cs and 127I, while in combination with the atomic parity violation (APV) experimental results, it allows us to determine a data-driven APV measurement of the low-energy weak mixing angle in very good agreement with the Standard Model prediction
We updated the analyses of the coherent neutrino-nucleus elastic scattering data of the COHERENT experiment [1] presented in Refs. [6,13,15], taking into account the new quenching factor published recently in Ref. [19]
Summary
Coherent elastic neutrino-nucleus scattering is a new powerful tool that allows us to probe neutrino, electroweak, and nuclear physics, after its first, and so far only, observation in the COHERENT experiment [1] This process was predicted a long time ago [2,3,4], but it eluded experimental detection because of the difficulty to observe nuclear recoils with a very small kinetic energy T of a few keV. II, III, and IV, we update, respectively, the results on the average rms radius of the neutron distributions in CsI, on the weak mixing angle, and on the neutrino charge radii presented in Refs.
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