Search for multi-charged Heavy Stable Charged Particles

Many models of new physics allow for particles that are massive, long-lived, and have an electric charge greater than that of the electron, $e$. We perform a search for evidence of such particles using 5.0 \fbinv\ of data collected with the CMS detector. %studying pp collisions at a center-of-mass energy of 7 TeV. The distinctive detector signatures of such particles are that they are slow-moving and highly ionizing. By using the silicon tracker for ionization measurements and the muon system for time of flight, we are sensitive to particles with charge of one to five times the electron charge. We find no significant excess compared to the standard model expectation and set limits on the pair production cross section using a fourth generation model. We exclude masses below 427, 489, 545, 572 and 504 \GeVcc\ for charges of 1$e$, 2$e$, 3$e$, 4$e$ and 5$e$, respectively. Limits on the electric charge for masses of 100, 200, 300, 400, 450, and 500 GeV/$c^2$ are also obtained, excluding charges 1--5$e$, 1--5$e$, 1--5$e$, 1--5$e$, 1.3--5$e$, and 2.2--5$e$, respectively.