Search for supersymmetry in events with leptons (e, μ, τ), jets and missing transverse energy with the ATLAS detector at the LHC

Rose, Anthony (2013) Search for supersymmetry in events with leptons (e, μ, τ), jets and missing transverse energy with the ATLAS detector at the LHC. Doctoral thesis (PhD), University of Sussex.

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Abstract

Two searches for events containing τ-leptons, jets, large missing transverse momentum, and zero or one light leptons (ℓ = e,μ) in the final state have been performed using proton-proton collision data at √s = 7 TeV, recorded with the ATLAS detector at the Large Hadron Collider. The first search was performed using 2:05fb-1 of the ATLAS data collected in 2011, and focused on the final state containing two hadronically decaying τ-leptons. For the second search the dataset was extended to 4:7fb-1, and four separate channels (1τ, 2τ, τ+e, τ+μ) were combined for the final result. No excess above the Standard Model background expectation is observed and 95% CL visible cross-section upper limits for new phenomena are set. In the framework of gauge-mediated SUSY-breaking models (GMSB), exclusion limits on the GMSB mass scale Λ are set at 54 TeV in the regions where the lightest ~τ is the next-to-lightest SUSY particle (tan β > 20). These limits provide the most stringent tests to date of GMSB models in a large part of the considered parameter space.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Library Cataloguing
Date Deposited: 10 Dec 2013 17:06
Last Modified: 17 Sep 2015 14:43
URI: http://srodev.sussex.ac.uk/id/eprint/47218

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