Searching for Stopped Gluinos at CMS

TL;DR

This paper proposes a method to search for long-lived particles like stopped gluinos at CMS by detecting their delayed decays during non-collision periods, potentially revealing new physics with minimal background interference.

Contribution

It introduces a novel search strategy for long-lived particles using CMS detector triggers during beam gaps, focusing on models like split-susy gluinos and estimating significant discovery potential.

Findings

Potential to detect long-lived gluinos with high significance

Effective use of calorimeter triggers during non-collision periods

Minimal background expected for these decay searches

Abstract

We describe plans for a search for long-lived particles which will become stopped by the CMS detector. We will look for the subsequent decay of these particles during time intervals where there are no $pp$ collisions in CMS: during gaps between crossings in the LHC beam structure, and during inter-fill periods between the beam being dumped and re-injection. Such long living particles decays will be recorded with dedicated calorimeter triggers. For models predicting these particles, such as split-susy gluinos, the large cross-section combined with good stopping power of CMS, yields a significant number of triggerable decays. If LHC instantaneous luminosity approaches 10^32 cm^-2 s^-1 in 2009-10, 5-sigma significance can be established in a matter of days, since these decays occur on top of a negligible background. Due to limited size, this paper concentrates on main idea and expected results. More details are available in https://twiki.cern.ch/twiki/bin/view/CMS/PhysicsResults.