Abstract
A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton, with zero or one additional light lepton (e/mu), has been performed using 4.7 fb-1 of proton-proton collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% confidence level visible cross-section upper limit for new phenomena is set. In the framework of gauge-mediated SUSY-breaking models, lower limits on the mass scale Lambda are set at 54 TeV in the regions where the stau is the next-to-lightest SUSY particle (tan(beta) > 20). These limits provide the most stringent tests to date of GMSB models in a large part of the parameter space considered.
Highlights
This paper reports on the search for supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9] in events with large missing transverse momentum, jets and at least one hadronically decaying τ lepton
For the analysis presented in this paper, Λ and tan β are treated as free parameters, and the other parameters are fixed to the values already used in Refs. [21, 22]: Mmess = 250 TeV, N5 = 3, μ > 0 and Cgrav = 1
The signal-event upper limits translate into a 95 % confidence level (CL) observed upper limit on the visible cross-section for new phenomena for each of the four final states, defined by the product of cross-section, branching fraction, acceptance and efficiency for the selections defined in Sect
Summary
This paper reports on the search for supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9] in events with large missing transverse momentum, jets and at least one hadronically decaying τ lepton. Previous searches for τ1 pair production, with the subsequent decay τ1 → τ Gin the minimal GMSB model, have been reported by the LEP Collaborations ALEPH [23], DELPHI [24] and OPAL [25]. The analysis reported in this paper extends the searches in 2 fb−1 of data presented in Refs. The CMS Collaboration has searched for new phenomena in same-sign τ -pair events [29] and multi-lepton events including two τ leptons in the final state [30] using 35 pb−1 of data, where the minimal GMSB model was not considered
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