INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Search for Scalar Top Quark Pair Production in Natural Gauge Mediated Supersymmetry Models with the ATLAS Detector in pp Collisions at √s =7 TeV
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 213 p. 1 - 23
ISSN:
0370-2693
Resumen:
The results of a search for pair production of the lighter scalar
partners of top quarks in 2.05 fb-1 of pp collisions at sqrt(s) =7 TeV
using the ATLAS experiment at the LHC are reported. Scalar top quarks
are searched for in events with two same flavour opposite-sign leptons
(electrons or muons) with invariant mass consistent with the Z boson
mass, large missing transverse momentum and jets in the final state. At
least one of the jets is identified as originating from a b-quark. No
excess over Standard Model expectations is found. The results are
interpreted in the framework of R-parity conserving, gauge mediated
Supersymmetry breaking `natural' scenarios, where the neutralino is the
next-to-lightest supersymmetric particle. Scalar top quark masses up to
310 GeV are excluded for the lightest neutralino mass between 115 GeV
and 230 GeV at 95% confidence level, reaching an exclusion of the scalar
top quark mass of 330 GeV for the lightest neutralino mass of 190 GeV.
Scalar top quark masses below 240 GeV are excluded for all values of the
lightest neutralino mass above the Z boson mass.