4 research outputs found
Neutralino Dark Matter in Mirage Mediation
We study the phenomenology of neutralino dark matter (DM) in mirage mediation
scenario of supersymmetry breaking which results from the moduli stabilization
in some string/brane models. Depending upon the model parameters, especially
the anomaly to modulus mediation ratio determined by the moduli stabilization
mechanism, the nature of the lightest supersymmetric particle (LSP) changes
from Bino-like neutralino to Higgsino-like one via Bino-Higgsino mixing region.
For the Bino-like LSP, the standard thermal production mechanism can give a
right amount of relic DM density through the stop/stau-neutralino
coannihilation or the pseudo-scalar Higgs resonance process. We also examine
the prospect of direct and indirect DM detection in various parameter regions
of mirage mediation. Neutralino DM in galactic halo might be detected by near
future direct detection experiments in the case of Bino-Higgsino mixed LSP. The
gamma ray flux from Galactic Center might be detectable also if the DM density
profile takes a cuspy shape.Comment: One reference adde
Update on the Direct Detection of Dark Matter in MSSM Models with Non-Universal Higgs Masses
We discuss the possibilities for the direct detection of neutralino dark
matter via elastic scattering in variants of the minimal supersymmetric
extension of the Standard Model (MSSM) with non-universal
supersymmetry-breaking contributions to the Higgs masses, which may be either
equal (NUHM1) or independent (NUHM2). We compare the ranges found in the NUHM1
and NUHM2 with that found in the MSSM with universal supersymmetry-breaking
contributions to all scalar masses, the CMSSM. We find that both the NUHM1 and
NUHM2 offer the possibility of larger spin-independent dark matter scattering
cross sections than in the CMSSM for larger neutralino masses, since they allow
the density of heavier neutralinos with large Higgsino components to fall
within the allowed range by astrophysics. The NUHM1 and NUHM2 also offer more
possibilities than the CMSSM for small cross sections for lower neutralino
masses, since they may be suppressed by scalar and pseudoscalar Higgs masses
that are larger than in the CMSSM.Comment: 35 pages, 14 figures, submitted to New Journal of Physics focus issue
"Dark Matter and Particle Physics
The Muon Magnetic Moment and Supersymmetry
The present review is devoted to the muon magnetic moment and its role in
supersymmetry phenomenology. Analytical results for the leading supersymmetric
one- and two-loop contributions are provided, numerical examples are given and
the dominant tan(beta)sign(mu)/M_SUSY^2 behaviour is qualitatively explained.
The consequences of the Brookhaven measurement are discussed. The 2 sigma
deviation from the Standard Model prediction implies preferred ranges for
supersymmetry parameters, in particular upper and lower mass bounds.
Correlations with other observables from collider physics and cosmology are
reviewed. We give, wherever possible, an intuitive understanding of each result
before providing a detailed discussion.Comment: Topical Review; 54 pages, 18 figure