Physical Review Letters
The results of the first search for long-lived gluinos produced in 7 TeV pp collisions at the CERN Large Hadron Collider are presented. The search looks for evidence of long-lived particles that stop in the CMS detector and decay in the quiescent periods between beam crossings. In a dataset with a peak instantaneous luminosity of 1 1032 cm2 s1, an integrated luminosity of 10 pb1, and a search interval corresponding to 62 hours of LHC operation, no significant excess above background was observed. Limits at the 95% confidence level on gluino pair production over 13 orders of magnitude of gluino lifetime are set. For a mass difference mg~ m ~0 1 > 100 GeV=c2, and assuming BRðg~ ! g ~0 1Þ ¼ 100%, mg~ < 370 GeV=c2 are excluded for lifetimes from 10 s to 1000 s.
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., . . . Weinberg, M. (2011). Search for stopped gluinos in pp collisions at √s=7TeV. Physical Review Letters, 106(1)