Search for stopped long-lived particles produced in pp collisions at s√=7TeV

Authors

The CMS Collaboration
S. Chatrchyan, Yerevan Physics Institute
V. Khachatryan, Yerevan Physics Institute
Marc M. Baarmand, Florida Institute of Technology
B. Dorney, Florida Institute of Technology
Marcus Hohlmann, Florida Institute of Technology
Himali Kalakhety, Florida Institute of Technology
Igor B. Vodopiyanov, Florida Institute of Technology

Document Type

Article

Publication Title

Journal of High Energy Physics

Abstract

A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 fb⁻¹, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6 ± 2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the “cloud model” of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 μs and 1000 s.

DOI

10.1007/JHEP08(2012)026

Publication Date

2012

Recommended Citation

The CMS collaboration., Chatrchyan, S., Khachatryan, V. et al. Search for stopped long-lived particles produced in pp collisions at s√=7TeV . J. High Energ. Phys. 2012, 26 (2012). https://doi.org/10.1007/JHEP08(2012)026