Search for stopped long-lived particles produced in pp collisions at sqrt(s)=7 TeV

Abstract : A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6+/-2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the "cloud model" of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds.
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Contributor : Sylvie Flores <>
Submitted on : Tuesday, July 3, 2012 - 7:22:31 AM
Last modification on : Monday, February 10, 2020 - 6:13:07 PM

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S. Chatrchyan, M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Search for stopped long-lived particles produced in pp collisions at sqrt(s)=7 TeV. Journal of High Energy Physics, Springer, 2012, 8, pp.026. ⟨10.1007/JHEP08(2012)026⟩. ⟨in2p3-00713885⟩

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