Description
DUNE is a next-generation neutrino physics experiment that is currently under construction in the United States. The experiment will feature a high-intensity neutrino beam and a Near and Far Detector complexes located at a distance of 574 m and 1300 km from the neutrino source, respectively. While the primary goal of DUNE will be the discovery of CP violation in the lepton sector and the measurement of the yet undetermined neutrino oscillation parameters, the experiment will also pursue a broad program of searches for physics Beyond the Standard Model.
Located at the DUNE Near Detector complex, the SAND detector will exploit the high intensity of the DUNE neutrino beam, together with its high-resolution gas-detector tracker and electromagnetic calorimeter operating in a magnetic field, to search for a variety of BSM phenomena, including so-called Dark Neutrino models. In this class of models, Heavy Neutral Leptons are produced in the scattering of standard model neutrinos and undergo displaced decays into di-lepton pairs through the exchange of a new dark sector gauge boson $Z^\prime$, or dark photon.
This contribution presents a first estimate of the discovery potential in SAND for Dark Neutrino models featuring decays to $e^+e^-$ pairs. A dedicated event generator was integrated in the standard SAND simulation chain and a multivariate classification was performed to estimate the SAND sensitivity to the models under study.
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