Search for long-lived neutral particle decays with first 1.9 fb−1 of 2011 data collected with the ATLAS detector at the LHC
University of Calabria, ponte P. Bucci, 87036 Rende (CS), Italy
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Many extensions of the Standard Model (SM) include neutral weakly-coupled particles that can be long-lived. These long-lived particles occur in many models, included gauge-mediated extensions of the Minimal Supersymmetric Model (MSSM), MSSM with R-parity violation, inelastic dark matter and the Hidden Valley (HV) scenario. Results are presented on the first ATLAS searches at the LHC for possible rare Higgs boson decays to pair of neutral, long-lived hidden-sector particles that lead to final states containing fermion anti-fermion pairs or pairs of collimated lepton jets. No excess of events above the expected background has been observed for 1.9 fb−1 of data collected in 2011 at a center of mass energy of 7 TeV. Limits are presented as a function of the proper lifetime of the long-lived neutral particle.
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