15,159 research outputs found
A possible nuclear effect on the NuTeV sin^2 theta_W anomaly
We investigate a possible explanation for the NuTeV anomaly in terms of a
nuclear correction difference between u_v and d_v distributions. Analyzing deep
elastic scattering and Drell-Yan data for nuclear targets, we try to determine
the correction difference and its effect on the anomaly. We find that the
difference cannot be precisely determined at this stage due to the lack of data
which are sensitive to the difference. Therefore, it is difficult to draw a
solid conclusion about its effect although the anomaly could be explained, at
least partially, by this kind of nuclear correction.Comment: 3 pages, 1 figure, to be published in the proceedings of the XVIIth
Particles and Nuclei International Conference (PANIC), Santa Fe, New Mexico,
USA, October 24-28, 200
Lepton Flavor Violations in High-Scale SUSY with Right-Handed Neutrinos
Motivated by the recent discovery of the Higgs boson at m_h = 126 GeV and
also by the non-observation of superparticles at the LHC, high-scale SUSY,
where the superparticles are as heavy as O(10) TeV, has been recently proposed.
We study lepton-flavor violations (LFVs) in the high-scale SUSY with
right-handed neutrinos. Even if the slepton masses are of O(10) TeV, the
renormalization group (RG) effects on the slepton mass-squared matrix may
induce large enough LFVs which are within the reach of future LFV experiments.
We also discuss the implication of the right-handed neutrinos on the
electroweak symmetry breaking in such a model, and show that the parameter
region with the successful electroweak symmetry breaking is enlarged by the RG
effects due to the right-handed neutrinos.Comment: 11 pages, 3 figure
Inhomogeneous Ferromagnetism and Unconventional Charge Dynamics in Disordered Double Exchange Magnets
We solve the double exchange model in the presence of arbitrary
substitutional disorder by using a self consistently generated effective
Hamiltonian for the spin degrees of freedom. The magnetic properties are
studied through classical Monte Carlo while the effective exchange, ,
are calculated by solving the disordered fermion problem, and renormalised
self-consistently with increasing temperature. We present exact results on the
conductivity, magnetoresistance, optical response and `real space' structure of
the inhomogeneous ferromagnetic state, and compare our results with charge
dynamics in disordered La_{1-x}Sr_xMnO_3. The large sizes, ,
accessible within our method allows a complete, controlled calculation on the
disordered strongly interacting problem.Comment: 4 pages, 2 column revtex, 5 embedded figure
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