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 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 $\lesssim 10\text{keV}$, $g_{A^{{}^{\prime }}}\lesssim 34\times {10}^{-7}$ for mass $\lesssim 10\text{keV}$, $g_S\lesssim 49\times {10}^{-7}$ for mass $\lesssim 20\text{keV}$ and $g_P\lesssim 67\times {10}^{-7}$ for mass $\lesssim 30\text{keV}$.