Search for Stopped Gluinos in pp collisions at sqrt s = 7 TeV

TL;DR

This paper reports the first search for long-lived gluinos at the LHC, setting new limits on their mass and lifetime based on data from the CMS detector, with no significant excess observed.

Contribution

It introduces a novel search method for stopped long-lived gluinos in proton-proton collisions at 7 TeV, extending sensitivity to a wide range of lifetimes.

Findings

No significant excess above background was observed.

Gluinos with mass less than 370 GeV/c^2 are excluded for certain lifetimes.

Limits are set over 13 orders of magnitude of gluino lifetime.

Abstract

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 10^{32} cm^{-2} s^{-1}, an integrated luminosity of 10 inverse picobarns, 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 between the gluino and the neutralino greater than 100 GeV/c^2, and assuming a branching ratio for gluino to gluon+neutralino of 100%, gluinos of mass less than 370 GeV/c^2 are excluded for lifetimes from 10 microseconds to 1000 s.