227 research outputs found
Constraining Anomaly Mediated Supersymmetry Breaking Framework via Ongoing Muon g-2 Experiment at Brookhaven
The ongoing high precision E821 Brookhaven National Laboratory experiment on
muon g-2 is promising to probe a theory involving supersymmetry. We have
studied the constraints on the minimal Anomaly Mediated Supersymmetry Breaking
(AMSB) model using the current data of muon g-2 from Brookhaven. A scenario of
seeing no deviation from the Standard Model is also considered, within a
limit of the combined error from the Standard Model result and the
Brookhaven predicted uncertainty level. The resulting constraint is found to be
complementary to what one obtains from bounds within the AMSB
scenario, since only a definite sign of is effectively probed via . A few relevant generic features of the model are also described for
disallowed regions of parameter space.Comment: 24 pages, LaTeX, 5 postscript figures. A few references added. Final
version to appear in Phys. Rev.
Higgsino Dark Matter in Nonuniversal Gaugino Mass Models
We study two simple and well motivated nonuniversal gaugino mass models,
which predict higgsino dark matter. One can account for the observed dark
matter relic density along with the observed Higgs boson mass of ~ 125 GeV over
a large region of the parameter space of each model, corresponding to higgsino
mass of ~ 1 TeV. In each case this parameter region covers the gluino mass
range of 2-3 TeV, parts of which can be probed by the 14 TeV LHC experiments.
We study these model predictions for LHC in brief and for dark matter detection
experiments in greater detail.Comment: 35 pages, 11 figures, pdflatex, new references and a few relevant
decay branching ratios added in two tables. Version to appear in Phys Rev
LHC Signature of the Minimal SUGRA Model with a Large Soft Scalar Mass
Thanks to the focus point phenomenon, it is quite {\it natural} for the
minimal SUGRA model to have a large soft scalar mass m_0 > 1 TeV. A distinctive
feature of this model is an inverted hierarchy, where the lighter stop has a
significantly smaller mass than the other squarks and sleptons. Consequently,
the gluino is predicted to decay dominantly via stop exchange into a channel
containing 2b and 2W along with the LSP. We exploit this feature to construct a
robust signature for this model at the LHC in leptonic channels with 3-4 b-tags
and a large missing-E_T.Comment: Small clarifications added. Final version to appear in Phys. Lett.
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