Search for Heavy Stable Charged Particles in CMS

The result of a search at the LHC for heavy stable charged particles produced in pp collisions at $\sqrt{s}= 7$~TeV is described. The data sample was collected with the CMS detector and corresponds to an integrated luminosity of $3.1$~pb$^{-1}$. Momentum and ionization-energy-loss measurements in the inner tracker detector are used to identify tracks compatible with heavy slow-moving particles. Additionally, tracks passing muon identification requirements are also analyzed for the same signature. In each case, no candidate passes the selection, with an expected background of less than $0.1$ events. A lower limit at the 95\% confidence level on the mass of a stable gluino is set at $398$~GeV/c$^2$, using a conventional model of nuclear interactions that allows charged hadrons containing this particle to reach the muon detectors. A lower limit of $311$~GeV/c$^2$ is also set for a stable gluino in a conservative scenario of complete charge suppression, where any hadron containing this particle becomes neutral before reaching the muon detectors.