A search for solar axions and anomalous neutrino magnetic moment with the complete PandaX-II data

TL;DR

This study uses PandaX-II data to search for solar axions and neutrino magnetic moments, setting new limits and confirming that the XENON1T excess is consistent with their findings.

Contribution

It provides the first comprehensive search for solar axions and neutrino magnetic moments using the complete PandaX-II dataset, establishing new upper bounds.

Findings

Axion-electron coupling $g_{Ae}<4.6\times 10^{-12}$ for axion mass <$0.1$ keV/c$^2$

Neutrino magnetic moment $\mu_{\nu}<4.9\times 10^{-11}\mu_B$ at 90% CL

XENON1T excess is consistent with PandaX-II constraints

Abstract

We report a search for new physics signals using the low energy electron recoil events in the complete data set from PandaX-II, in light of the recent event excess reported by XENON1T. The data correspond to a total exposure of 100.7 ton-day with liquid xenon. With robust estimates of the dominant background spectra, we perform sensitive searches on solar axions and neutrinos with enhanced magnetic moment. We find that the axion-electron coupling $g_{Ae}<4.6\times 10^{-12}$ for an axion mass less than $\rm 0.1~keV/c^2$ and the neutrino magnetic moment $\mu_{\nu}<4.9\times 10^{-11}\mu_{B}$ at 90% confidence level. The observed excess from XENON1T is within our experimental constraints.