Search For A Z’ Resonance Using Forward/Backward Asymmetry In Compact Muon Solenoid at A Center-Of-Mass Energy Of 8 TeV

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2013-05-31

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At the Large Hadron Collider (LHC), the Standard Model (SM) of particle physics is continually being tested and examined. This research is focused on searching for a Z0 resonance at the Compact Muon Solenoid (CMS) detector. We have examined 20 fb􀀀1 of data taken in 2012. During this period, the LHC delivered opposing beams of protons of 8 TeV. The process being studied is known as the Drell-Yan process, wherein a quark and anti-quark annihilate and produce a lepton pair. This process is mediated either by a virtual photon ( ) or a Z boson, depending on the mass range. The presence of the two electroweak bosons (Z/ ) creates both vector and axial-vector coupling to fermions, which in turn creates an asymmetry in the polar angle between the lepton and quark. This asymmetry is called the forward-backward asymmetry (AFB) and is used to search for a high mass Z0 resonance. Results are compared with Monte-Carlo simulations for several models predicting Z0 resonances at di erent mass points. In the absence of a clear resonance, this information is used to place lower mass limits on the possible existence of a resonance. ii

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