Search for New Physical Phenomena via Displaced Muon Signatures with the CMS Detector at the LHC

Solmaz, Melih M.S., Purdue University, August 2014. Search for New Physical Phenomena via Displaced Muon Signatures with the CMS Detector at the LHC. Major Professor: Ian P. Shipsey. The first search at the LHC for long-lived neutral particles decaying to pairs of muons by using only the muon chambers is presented. Events were collected by the CMS detector during pp collisions at p s = 8 TeV and selected from data samples corresponding to 20.5 fb 1 of integrated luminosity. No background events are expected after the full analysis selection. Expected upper limits are derived for a model which predicts a heavy scalar decaying to two long-lived particles, each of which can decay to muon pairs. Combined expected upper limits with an analysis utilizing the CMS silicon tracker to search for the same signature are also presented.