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.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:589093 |
| Date | January 2013 |
| Creators | Rose, Anthony |
| Publisher | University of Sussex |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://sro.sussex.ac.uk/id/eprint/47218/ |
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