engleski

Measurement of W and Z pair production and search for WZ resonances at the Large Hadron Collider

This thesis presents a study of WZ production in proton proton collisions at a center of mass energy of 7 TeV. The measurements are based on data recorded by the CMS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of approximately 5 fb-1. The electron and muon decay channels of the W and Z bosons are used. A measurement of the inclusive cross section of the pp -> WZ + X process is performed, restricted to the phase space for which the Z boson mass lies in the interval [71.18, 111.18] GeV. The measurement result is compatible with the Standard model predictions. A search for exotic heavy resonances decaying to WZ is also presented. No significant excess above the expected SM background is found. New upper bounds at 95% confidence level are therefore set on the production cross section of the W’ boson described by the sequential standard model, and lower bounds on W’ bosons masses are set. Limits are also set on the production cross section and mass of the rho_TC techni-hadron in the context of low-scale Technicolor models.

Standard Model; Electroweak physics; Triple gauge coupling (TGC); WZ; Sequential Standard Model; Technicolor; Large Hadron Collider (LHC); Compact Muon Solenoid (CMS)

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