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Author Gollapinni, Sowjanya
Title Search for contact interactions in the dimuon channel in p-p collisions at s = 7 TeV at CMS [electronic resource] / by Sowjanya Gollapinni.
Publication Info. 2012
Location Call No. Status Notes
 Libraries Electronic Books  Electronic Resource - WSU ETD    AVAIL. ONLINE
Description 124 p. : ill.
Note Advisor: Paul E. Karchin
Thesis Thesis (Ph.D.) -- Wayne State University, 2012.
Summary The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite particles made up of more basic constituents, a new physics interaction in the form of a four-fermion contact interaction arises between them. Experimentally the signal is manifest as a deviation from the SM prediction in the high-mass tail for the invariant mass distribution of the opposite-sign dimuon pairs. The Large Hadron Collider (LHC) experiment at the Center for European Nuclear Research (CERN) is built to explore new physics possibilities from proton-proton collisions occurring at the world's highest center-of-mass energy. This thesis discusses in detail a search strategy for a new physics possibility based on a left-handed current model of contact interactions. Based on 5.3 inverse femtobarns of 2011 LHC data as collected by the Compact Muon Solenoid (CMS) detector, exclusion lower limits at 95% confidence level are set on the compositeness energy scale for both destructive and constructive interferences of the new physics with the SM Drell-Yan process. These limits form the most stringent limits to date and exceed the current published limits significantly.
Subject Physics
Added Title Wayne State University thesis (Ph.D.) : Physics
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