Abstract
A number of extensions of the Standard Model result in neutral and weakly-coupled particles that decay with macroscopic decay lengths to multiple hadrons or leptons. These particles with decay paths that can be comparable with ATLAS detector dimensions represent, from an experimental point of view, a challenge both for the trigger and for the reconstruction capabilities of the ATLAS detector. We will present a set of signature driven triggers for the ATLAS detector that target such displaced decays and evaluate their performances for some benchmark models and describe analysis strategies and limits on the production of such long-lived particles. A first estimation of the Hidden Valley trigger rates has been evaluated with 6pb-1 of data collected at ATLAS during the data taking of 2010.
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