13,065 research outputs found
Exotic branes and non-geometric backgrounds
When string/M-theory is compactified to lower dimensions, the U-duality
symmetry predicts so-called exotic branes whose higher dimensional origin
cannot be explained by the standard string/M-theory branes. We argue that
exotic branes can be understood in higher dimensions as non-geometric
backgrounds or U-folds, and that they are important for the physics of systems
which originally contain no exotic charges, since the supertube effect
generically produces such exotic charges. We discuss the implications of exotic
backgrounds for black hole microstate (non-)geometries.Comment: 4 pages. v2: journal version. The discussion on "double puff-up"
revise
The impact of a 126 GeV Higgs on the neutralino mass
We highlight the differences of the dark matter sector between the
constrained minimal supersymmetric SM (CMSSM) and the next-to-minimal
supersymmetric SM (NMSSM) including the 126 GeV Higgs boson using GUT scale
parameters. In the dark matter sector the two models are quite orthogonal: in
the CMSSM the WIMP is largely a bino and requires large masses from the LHC
constraints. In the NMSSM the WIMP has a large singlino component and is
therefore independent of the LHC SUSY mass limits. The light NMSSM neutralino
mass range is of interest for the hints concerning light WIMPs in the Fermi
data. Such low mass WIMPs cannot be explained in the CMSSM. Furthermore,
prospects for discovery of XENON1T and LHC at 14 TeV are given.Comment: 18 pages, 5 figures, this version is accepted by PLB after
modifications including additional figure
Can we discover a light singlet-like NMSSM Higgs boson at the LHC?
In the next-to minimal supersymmetric standard model (NMSSM) one additional
singlet-like Higgs boson with small couplings to standard model (SM) particles
is introduced. Although the mass can be well below the discovered 125 GeV Higgs
boson mass its small couplings may make a discovery at the LHC difficult. We
use a novel scanning technique to efficiently scan the whole parameter space
and determine the range of cross sections and branching ratios for the light
singlet-like Higgs boson below 125 GeV. This allows to determine the
perspectives for the future discovery potential at the LHC. Specific LHC
benchmark points are selected representing the salient NMSSM features.Comment: 22 pages, 5 figures, this version is accepted by PLB after minor
modification
Higgs Branching Ratios in Constrained Minimal and Next-to-Minimal Supersymmetry Scenarios Surveyed
In the CMSSM the heaviest scalar and pseudo-scalar Higgs bosons decay largely
into b-quarks and tau-leptons because of the large values favored
by the relic density. In the NMSSM the number of possible decay modes is much
richer. In addition to the CMSSM-like scenarios, the decay of the heavy Higgs
bosons is preferentially into top quark pairs (if kinematically allowed),
lighter Higgs bosons or neutralinos, leading to invisible decays. We provide a
scan over the NMSSM parameter space to project the 6D parameter space of the
Higgs sector on the 3D space of the Higgs masses to determine the range of
branching ratios as function of the Higgs boson mass for all Higgs bosons.
Specific LHC benchmark points are proposed, which represent the salient NMSSM
features.Comment: 24 pages, 3 figures, this version is accepted by PLB after minor
modification
Perspectives of direct Detection of supersymmetric Dark Matter in the NMSSM
In the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM) the lightest
supersymmetric particle (LSP) is a candidate for the dark matter (DM) in the
universe. It is a mixture from the various gauginos and Higgsinos and can be
bino-, Higgsino- or singlino-dominated. Singlino-dominated LSPs can have very
low cross sections below the neutrino background from coherent neutrino
scattering which is limiting the sensitivity of future direct DM search
experiments. However, previous studies suggested that the combination of both,
the spin-dependent (SD) and spin-independent (SI) searches are sensitive in
complementary regions of parameter space, so considering both searches will
allow to explore practically the whole parameter space of the NMSSM. In this
letter, the different scenarios are investigated with a new scanning technique,
which reveals that significant regions of the NMSSM parameter space cannot be
explored, even if one considers both, SI and SD, searches.Comment: 22 pages, 3 figures, this version is accepted by PLB after minor
modification
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