PandaX-II Constraints on Spin-Dependent WIMP-Nucleon Effective Interactions.
2019
We present
PandaX-II constraints on candidate
WIMP-nucleon effective interactions involving the nucleon or
WIMPspin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and axial currents, magnetic and
electric dipole moments, and tensor interactions. The data set corresponding to a total exposure of 54-ton-days is reanalyzed to determine constraints as a function of the
WIMPmass and
isospincoupling. We obtain
WIMP-nucleon cross section bounds of $\rm 1.6 \times 10^{-41} cm^2$ and $\rm 9.0 \times 10^{-42} cm^2$ ($90\%$ c.l.) for neutron-only SD and tensor coupling, respectively, for a mass $M_\mathrm{
WIMP} \sim {\rm 40~GeV}/c^2$. The SD limits are the best currently available for $M_\mathrm{
WIMP} > {\rm 40~GeV}/c^2$. We show that
PandaX-II has reached a sensitivity sufficient to probe a variety of other candidate spin-dependent interactions at the weak scale.
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