Search for charged long-lived heavy particles with the ATLAS Experiment at the LHC

Several theories extending the Standard Model predict charged and heavy long-lived particles (LLP). Since LLPs potentially produced at the LHC can be slow, they should be identified through anomalous dE/dx energy loss measurement in the ATLAS Pixel detector. Selecting LLPs through the measurement of their track parameters in the vicinity of the interaction vertex opens to different scenarios of new physics, including those where LLPs are metastable. A search for such particles with the ATLAS detector at the LHC is presented, based on a data sample corresponding to an integrated luminosity of about 2.1 fb-1. No significant deviation from background expectations is observed and therefore a cross section limit is set. With some model dependent assumptions, this can be interpreted as excluding gluino R-hadrons with masses smaller than 810 GeV.