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Open Access item Search for stopped long-lived particles produced in pp collisions at √s=7 TeV
Brochero Cifuentes, J. A.
Cabrillo, I. J.
Chuang, S. H.
Duarte Campderros, J.
González Sánchez, J.
López Virto, A.
Muñoz Sánchez, F. J.
Rodriguez Marrero, Ana Y.
Ruiz Jimeno, Alberto
Sobron Sañudo, M.
|Publisher:||European Organization for Nuclear Research (CERN)|
|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.|
|Description:||31 páginas, 5 figuras, 3 tablas.-- CMS Collaboration: et al.|
|Publisher version (URL):||http://cdsweb.cern.ch/record/1458954?ln=es|
|Appears in Collections:||(IFCA) Artículos|
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