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Scientific article
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Search for stable hadronising squarks and gluinos with the ATLAS experiment at the LHC

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 701, no. 1, p. 1-19
Publication date2011
Abstract

Hitherto unobserved long-lived massive particles with electric and/or colour charge are predicted by a range of theories which extend the Standard Model. In this Letter a search is performed at the ATLAS experiment for slow-moving charged particles produced in proton–proton collisions at 7 TeV centre-of-mass energy at the LHC, using a data-set corresponding to an integrated luminosity of 34 pb−1. No deviations from Standard Model expectations are found. This result is interpreted in a framework of supersymmetry models in which coloured sparticles can hadronise into long-lived bound hadronic states, termed R-hadrons, and 95% CL limits are set on the production cross-sections of squarks and gluinos. The influence of R-hadron interactions in matter was studied using a number of different models, and lower mass limits for stable sbottoms and stops are found to be 294 and 309 GeV respectively. The lower mass limit for a stable gluino lies in the range from 562 to 586 GeV depending on the model assumed. Each of these constraints is the most stringent to date.

Keywords
  • Supersymmetry
  • Long-lived particle
  • R-hadron
  • Limit
Citation (ISO format)
ATLAS Collaboration. Search for stable hadronising squarks and gluinos with the ATLAS experiment at the LHC. In: Physics letters. B, 2011, vol. 701, n° 1, p. 1–19. doi: 10.1016/j.physletb.2011.05.010
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ISSN of the journal0370-2693
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