Constraints on general light mediators from PandaX-II electron recoil data

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