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. MajorProfessor: Ian P. Shipsey.The first search at the LHC for long-lived neutral particles decaying to pairs of muonsby using only the muon chambers is presented. Events were collected by the CMS√detector during pp collisions at s = 8 TeV and selected from data samples corresponding to 20.5 fb−1 of integrated luminosity. No background events are expectedafter the full analysis selection. Expected upper limits are derived for a model whichpredicts a heavy scalar decaying to two long-lived particles, each of which can decayto muon pairs. Combined expected upper limits with an analysis utilizing the CMSsilicon tracker to search for the same signature are also presented.