43 research outputs found
Optic nerve sheath meningioma: a case report
A case of a 75-year old male with right-sided exopthalmos is presented. Outside proptosis of the right eye was initially observed 6 years ago. Opthalmological and endocrinological clinical examination as well as laboratory tests revealed no pathology from optic nerve disc, optic bulb and thyroid related hormones. MRI study demonstrated an optic nerve meningioma. The key imaging findings and the differential diagnosis were discussed in this present paper
The impact of XENON100 and the LHC on Supersymmetric Dark Matter
The effect of 2010 and 2011 LHC data are discussed in connection to the
potential for the direct detection of supersymmetric dark matter. The impact of
the recent XENON100 results are contrasted to these predictions.Comment: 14 pages, 23 figures, To be published in the Proceedings of the 7th
DSU Conference, Beijing Chin
An Alternative Yukawa Unified SUSY Scenario
Supersymmetric SO(10) Grand Unified Theories with Yukawa unification
represent an appealing possibility for physics beyond the Standard Model.
However Yukawa unification is made difficult by large threshold corrections to
the bottom mass. Generally one is led to consider models where the sfermion
masses are large in order to suppress these corrections. Here we present
another possibility, in which the top and bottom GUT scale Yukawa couplings are
equal to a component of the charged lepton Yukawa matrix at the GUT scale in a
basis where this matrix is not diagonal. Physically, this weak eigenstate
Yukawa unification scenario corresponds to the case where the charged leptons
that are in the 16 of SO(10) containing the top and bottom quarks mix with
their counterparts in another SO(10) multiplet. Diagonalizing the resulting
Yukawa matrix introduces mixings in the neutrino sector. Specifically we find
that for a large region of parameter space with relatively light sparticles,
and which has not been ruled out by current LHC or other data, the mixing
induced in the neutrino sector is such that , in
agreement with data. The phenomenological implications are analyzed in some
detail.Comment: 32 pages, 22 Figure
Dark Matter and Higgs Mass in the CMSSM with Yukawa Quasi-Unification
We present an updated analysis of the constrained minimal supersymmetric
standard model with mu>0 supplemented by an `asymptotic' Yukawa coupling
quasi-unification condition, which allows an acceptable b-quark mass. Imposing
constraints from the cold dark matter abundance in the universe, B physics, the
muon anomalous magnetic moment, and the mass m_h of the lightest neutral
CP-even Higgs boson, we find that the lightest neutralino cannot act as a cold
dark matter candidate. This is mainly because the upper bound on the lightest
neutralino relic abundance from cold dark matter considerations, despite the
fact that this abundance is drastically reduced by neutralino-stau
coannihilations, is incompatible with the recent data on the branching ratio of
B_s --> mu^+ mu^-. Allowing for a different particle, such as the axino or the
gravitino, to be the lightest supersymmetric particle and, thus, constitute the
cold dark matter in the universe, we find that the predicted m_h's in our model
favor the range (119-126) GeV.Comment: 13 pages including 4 figures and 1 table, talk given by G. Lazarides
at the 7th International Workshop on the Dark Side of the Universe, KITPC,
Beijing, China, September 26-30, 2011 (to appear in the proceedings