Speaker
Description
This work investigates the feasibility and sensitivity of constraining the neutrino magnetic moment with liquid-argon detectors using DarkSide-50 data corresponding to an exposure of approximately $12~\mathrm{ton\cdot d}$.
To describe solar neutrino scattering in liquid argon, a neutrino–electron elastic scattering model including both weak and electromagnetic interactions is constructed. The analysis is performed using a Profile Likelihood method, with the uncertainties in the solar neutrino flux and background normalizations treated as nuisance parameters. Using the observed DarkSide-50 data, an upper limit on the neutrino magnetic moment of $\mu_\nu < 1.57\times10^{-11}\mu_B$ is obtained at 90% C.L.
In addition, Asimov datasets are used to study the impact of exposure and different background components on the projected sensitivity. The results indicate that the $\mathrm{^{39}Ar}$ and PMT backgrounds are the main factors limiting further improvements in sensitivity. For example, at an exposure of $12~\mathrm{ton\cdot d}$, assuming effective suppression of the $\mathrm{^{85}Kr}$ background and a 90\% reduction of the $\mathrm{^{39}Ar}$ background, a projected upper limit of $\mu_\nu < 1.05\times10^{-11}\mu_B$ can be achieved at 90% C.L.
