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') less than or similar to 32 x 10(-7) for the mediator mass less than or similar to 10 keV, g(A') less than or similar to 34 x 10(-7) for mass less than or similar to 10 keV, g(S) less than or similar to 49 x 10(-7) for mass less than or similar to 20 keV and g(P) less than or similar to 67 x 10(-7) for mass less than or similar to 30 keV. (C) 2021 The Author. Published by Elsevier B.V.

Automated summary

PandaX-II has analyzed the electron recoil energy spectrum data and confirmed the XENON1T (1-7) keV excess, providing stronger constraints on new physics models.