Search for decays of stopped, long-lived particles from 7 TeV pp collisions with the ATLAS detector

Details Search for decays of stopped, long-lived particles from 7 TeV pp collisions with the ATLAS detector Search for decays of stopped, long-lived particles from 7 TeV pp collisions with the ATLAS detector

2012-01-26

arxiv.org/abs/1201.5595v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages plus author list (23 pages total), 4 figures, 4 tables, submitted to Eur. Phys. J. C

Scientific paper

New metastable massive particles with electric and colour charge are features of many theories beyond the Standard Model. A search is performed for long-lived gluino-based R-hadrons with the ATLAS detector at the LHC using a data sample corresponding to an integrated luminosity of 31 pb^-1. We search for evidence of particles that have come to rest in the ATLAS detector and decay at some later time during the periods in the LHC bunch structure without proton-proton collisions. No significant deviations from the expected backgrounds are observed, and a cross-section limit is set. It can be interpreted as excluding gluino-based R-hadrons with masses less than 341 GeV at the 95% C.L., for lifetimes from 10^-5 to 10^3 seconds and a neutralino mass of 100 GeV.

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