DUNE Potential for Sub-Gev Dark Matter in Proton Beam Dump Mode

In this work we have explored the DUNE (Deep Underground Neutrino Experiment) potential for capturing the sub-GeV dark matter in viable dark matter parameter space. For this we have used DUNE near detector whose sensitivity for the detection of the signatures of dark matter candidate depends on beam energy; size, geometry and material of the detector; angle acceptance of detector and mitigation of neutrino background. To consider the dark matter candidates in physics framework the standard model is extended by introducing an extra dark gauge group U(1)D which couples to the standard model hypercharge U(1)Y gauge group via vector portal by using kinetic mixing term ε. As dark matter produced here uses 120 GeV proton beam facility of DUNE therefore three channels π 0/η-decay, proton bremsstrahlung and partonlevel are used for dark matter production which are relevant in this energy range. The neutrino background is minimized by using DUNE experiment in beam dump mode. To explore the new region of parameter space of dark matter at DUNE near detector the elastic scattering of dark matter beam with electrons and nucleons are studied. The simulation result shows that DUNE can capture dark matter signatures for larger parameter space of (mχ , ε 2αD) in comparison to the other existing dark matter probes for example BaBar, E137, LSND, MiniBooNE, T2K etc.