Search for stopped long-lived particles produced in pp collisions at vs = 7 TeV
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Chatrchyan, S.; Brochero Cifuentes, Javier Andrés









Fecha
2012-08Derechos
Attribution 4.0 International. ©CERN, for the benefit of the CMS Collaboration
Publicado en
Journal of High Energy Physics, 2012, 2012(8), 26
Editorial
Springer Verlag
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Palabras clave
Hadron-hadron scattering
Resumen/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 fb−1, 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 μs and 1000 s.
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