INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Search for stable hadronising squarks and gluinos with the ATLAS experiment at the LHC
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2011 p. 1 - 23
ISSN:
0370-2693
Resumen:
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 paper 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.