New constraint on neutrino magnetic moment from LZ dark matter search results

Elastic neutrino-electron scattering represents a powerful tool to investigate key neutrino properties. In view of the recent results released by the LUX-ZEPLIN Collaboration, we provide a first determination of the limits achievable on the neutrino magnetic moment, whose effect becomes non negligible in some beyond the Standard Model theories. Interestingly, we are able to show that the new LUX-ZEPLIN data allows us to set the most stringent limit on the neutrino magnetic moment when compared to the other laboratory bounds, namely $\mu_{\nu}^{\rm{eff}} < 6.3 \times 10^{-12} \, \mu_{\text{B}}$ at 90$\%$ C.L.. This limit supersedes the previous best one set by the Borexino Collaboration by almost a factor of 5 and it rejects by more than 5$\sigma$ the hint of a possible neutrino magnetic moment found by the XENON1T Collaboration.