Searching for Stopped Gluinos during Beam-off Periods at CMS

In this note we describe plans for a search for long-lived particles which have become stopped by the CMS detector. We will look for the subsequent decay of these particles during time intervals where there are no $pp$ collisions in CMS. In particular, we will search for decays during gaps between crossings in the LHC beam structure as well as the inter-fill period between the beam being dumped and re-injection. We record such decays with dedicated calorimeter triggers. For models, such as split-susy gluinos, the relatively large cross-section combined with the relatively good stopping power of CMS, yields a significant number of triggerable decays. If LHC instantaneous luminosity approaches $10^{32}cm^{-2}s^{-1}$ in 2009-10, 5 sigma significance can be established in a matter of days since these decays occur on top of a negligible background.