Physics implications of a combined analysis of COHERENT CsI and LAr data

Abstract

The observation of coherent elastic neutrino nucleus scattering has opened the window to many physics opportunities. This process has been measured by the COHERENT Collaboration using two different targets, first CsI and then argon. Recently, the COHERENT Collaboration has updated the CsI data analysis with a higher statistics and an improved understanding of systematics. Here we perform a detailed statistical analysis of the full CsI data and combine it with the previous argon result. We discuss a vast array of implications, from tests of the Standard Model to new physics probes. In our analyses we take into account experimental uncertainties associated to the efficiency as well as the timing distribution of neutrino fluxes, making our results rather robust. In particular, we update previous measurements of the weak mixing angle and the neutron root mean square charge radius for CsI and argon. We also update the constraints on new physics scenarios including neutrino nonstandard interactions and the most general case of neutrino generalized interactions, as well as the possibility of light mediators. Finally, constraints on neutrino electromagnetic properties are also examined, including the conversion to sterile neutrino states. In many cases, the inclusion of the recent CsI data leads to a dramatic improvement of bounds.

Probing Light New Mediators on Coherent Elastic Neutrino-Nucleus Scattering

“…Note that this mediator does not interfere with the SM case. The relevant contribution to the CEνNS process is given by [26]…”

“…Such neutrino generalized interactions have been previously studied for CEνNS in Refs. [21][22][23][24][25][26][27]. At low recoils, CDEX-10 data may place competitive or stronger bounds on their couplings and masses, as the new physics effects are inversely proportional to the recoil kinetic energy.…”

“…This process provides a new promising framework to investigate fundamental parameters of the Standard Model (SM) and new physics beyond the SM (BSM). For instance, it has been widely used to study the weak mixing angle [5,6], the neutrino electromagnetic properties [7,8], the effective generalized interactions [9][10][11][12], the non-standard neutrino interactions (NSI) [13][14][15][16], dark-matter (DM) research [17][18][19], and the light mediators [20][21][22][23][24][25][26][27].…”

“…All these proposals are theoretically well motivated ensuring a consistent description for a number of emerging discrepancies in precision studies of low-energy activities [75,76]. These have also been phenomenologically studied through the CEνNS process with different neutrino sources such as π-DAR [23][24][25][26], reactors [77][78][79], and solar neutrino [27,80] as well as next generation neutrino facilities [81,82].…”

Neutrino spin-flavour precession in magnetized white dwarf

“…The most recent analysis performed by the XENONnT experiment has estimated the upper limit on neutrino magnetic moment to be 6.4 × 10 −12 μ B [34][35][36] which is comparable with the limits obtained from the astronomical measurements. These bounds are expected to improve in future experiments [37][38][39][40][41][42].…”