Thursday, April 27 2017

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Dark shower is a generic feature of the Hidden Valley (HV) model, which produces bound states with a high multiplicity, low masses, and long lifetimes. The showering process can arise, for example, in Neutral Naturalness models, or in dark matter scenarios that explain the possible signal of gamma-ray excess. A collider search of such signals requires good vertex resolution, low energy threshold, as well as a good particle id to veto the background.