37 research outputs found
Relic density in nonuniversal gaugino mass models with SO(10) GUT symmetry
Non-universal boundary conditions in grand unified theories can lead to
nonuniversal gaugino masses at the unification scale. In R-parity preserving
theories the lightest supersymmetric particle is a natural candidate for the
dark matter. The composition of the lightest neutralino and the identity of the
next-to-lightest supersymmetric particle are studied, when nonuniversal gaugino
masses come from representations of SO(10). In these cases, the thermal relic
density compatible with the Wilkinson Microwave Anisotropy Probe observations
is found. Relic densities are compared with the universal case. Mass spectra in
the studied cases are discussed.Comment: 7 pages, 13 figures, revtex4, two-column. V2: Typos corrected and
references adde
Top jets as a probe of degenerate stop-NLSP LSP scenario in the framework of cMSSM
The degenerate stop NLSP and neutralino LSP scenario is well motivated but
hard to detect at the collider experiments. We propose a novel signature for
detection this scenario at the Large Hadron Collider (LHC) and demonstrate its
feasibility.Comment: 4 pages, 3 figure
Relic density in SO(10) SUSY GUT models
Non-universal boundary conditions in grand unified theories can lead to
non-universal gaugino masses at the unification scale. In R-parity preserving
theories the lightest supersymmetric particle is a natural candidate for the
dark matter. In this talk the composition of the lightest neutralino is
studied, when nonuniversal gaugino masses come from representations of SO(10).
In these cases, the thermal relic density compatible with WMAP observations is
found.Comment: Three pages, one figure. Latex with AIP-class. The present article
has been submitted for publication in the AIP Conference Proceedings of
SUSY08, June 16-21, 2008 Seoul, Korea. After it is published, it will be
found at http://proceedings.aip.org/proceeding
Invisible Higgs in theories of large extra dimensions
We discuss the possibility of detecting a Higgs boson in future collider
experiments if large extra dimensions are realized in nature. In such a case,
the Higgs boson can decay invisibly by oscillating into a graviscalar
Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an linear collider entails more complications than are usually thought of in
relation to an invisibly decaying Higgs, the main sources of such complications
being the simultaneous presence of a continuum graviton production and the
broadening of the Higgs peak. We discuss possible ways of overcoming such
difficulties, and conclude that the detection of such a Higgs boson might still
be a problem beyond the mass range of 250-300 GeV.Comment: 13 pages, 4 figures, Late
Stop as a next-to-lightest supersymmetric particle in constrained MSSM
So far the squarks have not been detected at the LHC indicating that they are
heavier than a few hundred GeVs, if they exist. The lighter stop can be
considerably lighter than the other squarks. We study the possibility that a
supersymmetric partner of the top quark, stop, is the next-to-lightest
supersymmetric particle in the constrained supersymmetric standard model.
Various constraints, on top of the mass limits, are taken into an account, and
the allowed parameter space for this scenario is determined. Observing stop
which is the next-to-lightest supersymmetric particle at the LHC may be
difficult.Comment: v2: A few references, a plot indicating used parameters, discussion
about the role of parameters in determination of the stop NLSP, CCB minima
and a comment about (g-2) added. Typos corrected. Version in PR
A large Muon Electric Dipole Moment from Flavor?
We study the prospects and opportunities of a large muon electric dipole
moment (EDM) of the order (10^{-24} - 10^{-22}) ecm. We investigate how natural
such a value is within the general minimal supersymmetric extension of the
Standard Model with CP violation from lepton flavor violation in view of the
experimental constraints. In models with hybrid gauge-gravity mediated
supersymmetry breaking a large muon EDM is indicative for the structure of
flavor breaking at the Planck scale, and points towards a high messenger scale.Comment: 12 pages, 12 figures. v3: References and Eq 28 fixed; conclusions
unchange