Stopping Gluinos

Abstract

Long lived gluinos are the trademark of split susy. They form R-hadrons that, when charged, efficiently lose energy in matter via ionisation. Independent of R-spectroscopy and initial hadronization, a fraction of R-hadrons become charged while traversing a detector. This results in a large number of stopped gluinos at present and future detectors. For a 300 GeV gluino, 10 6 will stop each year in LHC detectors, while several hundred stop in detectors during Run II at the Tevatron. The subsequent decays of stopped gluinos produce distinctive depositions of energy in calorimeters with no activity in either the tracker or the muon chamber.

Origins of hidden sector dark matter II: collider physics

“…This depends crucially on the nature of the LOSP -in particular, whether it is neutral or charged/colored. There is a large body of literature on detecting long-lived charged particles (such as staus) [45,[48][49][50] and colored particles (such as gluinos) [47], but relatively very little on long-lived neutral particles, however see [44]. This is because charged and colored long-lived particles (LOSPs in our case) leave tracks in the detector and can be stopped effectively by their interactions with matter.…”

“…Some fraction of LOSPs, emitted with small velocities, will lose their kinetic energy by ionization and stop inside the calorimeter. There have been proposals by both ATLAS and CMS to use the existing detector apparatus to precisely measure LOSP decays in their "inactive" mode [45][46][47]. In addition, there have been numerous proposals for stopper detectors which may be built outside the main detector to stop these particles in order to perform precision spectroscopy on their decays [48][49][50].…”

Agravity

“…b) much above the weak scale. For example, Einstein gravity naively suggests that any particle with mass M gives a finite gravitational correction to the Higgs mass at three [96] and two loops:…”

Diagnosing spin at the LHC via vector boson fusion

“…[29]). These stable, strongly interacting particles would have striking signatures at the LHC, either appearing as "slow muons" that are highly ionizing [29,30], or as stopped tracks in the detector [31,32]. The background is therefore limited to detector errors, which we will ignore for this study.…”