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 $1\times {10}^{32}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$, an integrated luminosity of $10{\mathrm{pb}}^{-1}$, 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 $m_{\tilde{g}}-m_{{\tilde{\chi }}_1^0}>100\mathrm{GeV}/c^2$, and assuming $\mathrm{BR}(\tilde{g}\to g{\tilde{\chi }}_1^0)=100\%$, $m_{\tilde{g}}<370\mathrm{GeV}/c^2$ are excluded for lifetimes from $10\mu \mathrm{s}$ to 1000 s.

• Received 26 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.011801

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© 2011 CERN, for the CMS Collaboration