Abstract
We propose a novel dark matter (DM) detection strategy for models with a nonminimal dark sector. The main ingredients in the underlying DM scenario are a boosted DM particle and a heavier dark sector state. The relativistic DM impinged on target material scatters off inelastically to the heavier state, which subsequently decays into DM along with lighter states including visible (standard model) particles. The expected signal event, therefore, accompanies a visible signature by the secondary cascade process associated with a recoiling of the target particle, differing from the typical neutrino signal not involving the secondary signature. We then discuss various kinematic features followed by DM detection prospects at large-volume neutrino detectors with a model framework where a dark gauge boson is the mediator between the standard model particles and DM.
Highlights
Introduction.—The direct detection of dark matter (DM) is a major strategy for probing its nongravitational interactions with standard model (SM) particles
The relativistic DM impinged on target material scatters off inelastically to the heavier state, which subsequently decays into DM along with lighter states including visible particles
We discuss various kinematic features followed by DM detection prospects at large-volume neutrino detectors with a model framework where a dark gauge boson is the mediator between the standard model particles and DM
Summary
Key role in search for the relativistic DM scattering signals arising in various models comprising them. The offdiagonal gauge interaction of χ1 and χ2 with Xμ appears in the second term with coupling g12 We expect that such a vertex may arise, e.g., from the mixing in the dark sector after imposing different Uð1ÞX charges to χ1 and χ2 [see Ref. The heavier nature of χ2 renders its decay eventually into χ1 plus SM or other (invisible) dark sector particles. We discuss the expected energy spectra of the recoiling target and the visible particles from the secondary vertex. We find that kinematically allowed maximum (minimum) total energy of the recoiling
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