Direct Detection of Sub-GeV Dark Matter with $s>1$ through the DM-Electron Scattering (I): case study for $s=3/2$ and $s=2$ with (pseudo)scalar mediator

Abstract: The observable signal of higher-spin particles is rare in current particle collider experiments. In the meantime, there have no evident constraints on the spin of the dark matter particles. And thereby it is natural to consider the possibility that the higher-spin particles behaves as dark matter. In this work, we investigate the direct detection of (spin-$3/2$) gravitino dark matter and (spin-$2$) massive KK-graviton dark matter respectively through the DM-electron scattering. Both the spin-independent (SI) and spin-independent (SD) interactions of DM are considered. Using the experiment datas of XENON10, XENON100 and XENON1T, we could give the restriction relation between the DM mass and cross section. For simplification, we only compute the corss section at leading order, while merely focus on the (pseudo)scalar mediators. Moreover, by evaluating and analyzing the form factor of DM, we uncover that if the mediator is scalar there have no significant signals to distinguish the DM with spin $3/2,2$ from the one with spin $0,1/2,1$.