3,320 research outputs found
Quark lepton complementarity and renormalization group effects
We consider a scenario for the Quark-Lepton Complementarity relations between
mixing angles in which the bi-maximal mixing follows from the neutrino mass
matrix. According to this scenario in the lowest order the angle \theta_{12} is
\sim 1\sigma (1.5 - 2^\circ) above the best fit point coinciding practically
with the tri-bimaximal mixing prediction. Realization of this scenario in the
context of the seesaw type-I mechanism with leptonic Dirac mass matrices
approximately equal to the quark mass matrices is studied. We calculate the
renormalization group corrections to \theta_{12} as well as to \theta_{13} in
the standard model (SM) and minimal supersymmetric standard model (MSSM). We
find that in large part of the parameter space corrections \Delta \theta_{12}
are small or negligible. In the MSSM version of the scenario the correction
\Delta \theta_{12} is in general positive. Small negative corrections appear in
the case of an inverted mass hierarchy and opposite CP parities of \nu_1 and
\nu_2 when leading contributions to \theta_{12} running are strongly
suppressed. The corrections are negative in the SM version in a large part of
the parameter space for values of the relative CP phase of \nu_1 and \nu_2:
\phi > \pi/2.Comment: version as published in PRD, 14 pages, 12 figure
Spectroscopically forbidden infra-red emission in Au-vertical graphene hybrid nanostructures
Implementation of Au nanoparticles (NPs) is a subject for frontier plasmonic
research due to its fascinating optical properties. Herein, the present study
deals with plasmonic assisted emission properties of Au NPs-vertical graphene
(VG) hybrid nanostructures. The influence of effective polarizability of Au NPs
on the surface enhanced Raman scattering and luminescence properties is
investigated. In addition, a remarkable infra-red (IR) emission in the hybrid
nanostructures is observed and interpreted on the basis of intra-band
transitions in Au NPs. The flake-like nanoporous VG structure is invoked for
the generation of additional confined photons to impart additional momentum and
a gradient of confined excitation energy towards initiating the intra-band
transitions of Au NPs. Integrating Au plasmonic materials in three-dimensional
VG nanostructures enhances the light-matter interactions. The present study
provides a new adaptable plasmonic assisted pathway for optoelectronic and
sensing applications.Comment: 5 figure
Isolated central nervous system familial hemophagocytic lymphohistiocytosis (fHLH) presenting as a mimic of demyelination in children
Isolated central nervous system (CNS) presentations of haemophagocytic lymphohistiocytosis (HLH), traditionally a systemic inflammatory condition, have been reported in adults and children. We identified nine patients with a diagnosis of isolated CNS familial hemophagocytic lymphohistiocytosis (fHLH) with symptom onset <18 years of age, and one asymptomatic sibling. Children with atypical chronic/recurrent CNS inflammation should be considered for immunological and genetic panel testing for fHLH even in the absence of any systemic inflammatory features. Despite haematopoietic stem cell transplantation (HSCT) being a mainstay of treatment, treatment failure and high morbidity and mortality post-HSCT suggest that alternative immune therapies may be worth considering
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