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Abstract

PandaX-II has analyzed their complete data set of the electron recoil energy
spectrum and has confirmed the XENON1T (1-7) keV excess, although the excess
was also found compatible with the total background. Treating the background as
well known, in which case it provides a good fit to the observed spectrum, one
can expect stronger constraints on any new physics model with this data. With
this motivation, we derive constraints on the new general vector (V),
axial-vector (A), scalar (S) and pseudoscalar (P) interactions if any of them
contribute to the neutrino-electron elastic scattering. The derived constraints
on the couplings at $90\%$ C.L., respectively, are $g_{V^{^{\prime }}} \lesssim
32 \times 10^{-7}$ for the mediator mass ${\lesssim 10}$ keV, $g_{A^{^{\prime
}}} \lesssim 34 \times 10^{-7}$ for mass ${\lesssim 10}$ keV, $g_{S}\lesssim 49
\times 10^{-7}$ for mass ${\lesssim 20}$ keV and $g_{P} \lesssim 67 \times
10^{-7}$ for mass ${\lesssim 30}$ keV.