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Resurrecting Hitomi for Decaying Dark Matter and Forecasting Leading Sensitivity for XRISM

Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L. +1 more

The Hitomi x-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking for narrow x-ray lines arising from DM decays. Unfortunately, the satellite was lost shortly after launch, and to date the only analysis using Hitomi for DM decay used data taken…