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Title: Search for new heavy neutral gauge bosons in √s = 8 TeV pp collisions with ATLAS
Author: Schnellbach, Yan-Jie
ISNI:       0000 0004 5363 2175
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2014
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This thesis describes the search for new heavy neutral gauge bosons decaying into di-electron pairs, focussing on the Z′SSM boson described by the Sequential Standard Model. The analysis uses 20.3fb−1 of pp collisions at √s = 8TeV recorded with the ATLAS detector during the 2012 data taking period at the Large Hadron Collider at CERN. The invariant mass spectrum of di-electron pairs is used as the search variable and is analysed in the region 80 GeV < mee < 4500 GeV. The spectrum is compared to the Standard Model expectation dominated by the neutral current Drell-Yan process. Several novel techniques are developed to improve the description of both, the Drell-Yan process and photon-induced di-lepton production. As no significant excess is found in the data, statistical techniques are used to interpret the result as limits on the production and decay of a new heavy gauge boson. A 95% C.L. Bayesian lower limit is set on the Z′SSM mass at 2.78TeV with a corresponding upper limit on the Z′SSM cross-section times branching ratio σ × Br(Z′SSM → e+e−) of 3.53 × 10−4 pb.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics