Implications of first LZ and XENONnT results: A comparative study of neutrino properties and light mediators

TL;DR

This study analyzes recent LZ and XENONnT data to set new limits on neutrino electromagnetic properties and light mediators, significantly improving constraints over previous experiments.

Contribution

It provides the first comprehensive comparison of LZ and XENONnT results on neutrino interactions and light mediators, establishing more stringent bounds.

Findings

XENONnT sets the most stringent limits on neutrino magnetic moments.

Constraints on neutrino millicharge are improved by an order of magnitude.

Enhanced sensitivity to light generalized neutrino interactions compared to previous data.

Abstract

Next generation direct dark matter detection experiments are favorable facilities to probe neutrino properties and light mediators beyond the Standard Model. We explore the implications of the recent data reported by LUX-ZEPLIN (LZ) and XENONnT collaborations on electromagnetic neutrino interactions and neutrino generalized interactions (NGIs). We show that XENONnT places the most stringent upper limits on the effective and transition neutrino magnetic moment (of the order of few $\times 10^{-12}~\mu_B$) as well as stringent constraints to neutrino millicharge (of the order of $\sim 10^{-13}~e$)--competitive to LZ--and improved by about one order of magnitude in comparison to existing constraints coming from Borexino and TEXONO. We furthermore explore the XENONnT and LZ sensitivities to simplified models with light NGIs and find improved constraints in comparison to those extracted from Borexino-Phase II data.