Signatures of pseudo-Dirac dark matter at high-intensity neutrino experiments

We (re)consider the sensitivity of past (LSND) and future (JSNS2) beam dump neutrino experiments to two models of MeV-scale pseudo-Dirac dark matter. Both LSND and JSNS2 are close (24-30 m) to intense sources of light neutral mesons which may decay to dark matter via interactions involving a light mediator or dipole operators. The dark matter can then scatter or decay inside of the nearby detector. We show that the higher beam energy of JSNS2 and resulting η production can improve on the reach of LSND for light-mediator models with dark matter masses greater than mπ/2. Further, we find that both existing LSND and future JSNS2 measurements can severely constrain the viable parameter space for a recently proposed model of dipole dark matter which could explain the 3.5 keV excess reported in observations of stacked galaxy clusters and the Galactic center.