Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √s = 8 TeV using the ATLAS experiment
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SEarch for metastable.pdf
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1.59 MB
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Author(s)
Taylor, Frank E
Date Issued
September 2015
Journal
European Physical Journal C
Publisher
Springer-Verlag
Citation
ATLAS Collaboration et al. “Search for Metastable Heavy Charged Particles with Large Ionisation Energy Loss in Pp Collisions at √S = 8 TeV Using the ATLAS Experiment.” The European Physical Journal C 75.9 (2015): n. pag. © 2015 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. Measuring heavy long-lived particles through their track parameters in the vicinity of the interaction vertex provides sensitivity to metastable particles with lifetimes from 0.6 ns to 30 ns. A search for such particles with the ATLAS detector at the Large Hadron Collider is presented, based on a data sample corresponding to an integrated luminosity of 18.4 fb [superscript −1] of pp collisions at √s = 8 TeV. No significant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on R-hadrons and chargino production are set. Gluino R-hadrons with 10 ns lifetime and masses up to 1185 GeV are excluded at 95 %% confidence level, and so are charginos with 15 ns lifetime and masses up to 482 GeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-015-3609-0
