14,420 research outputs found
Results from K2K and status of T2K
Results from the K2K experiment and status of the T2K experiment are
reported.Comment: 9 pages, 6 figures. Talk at International Conference on New Trends in
High-Energy Physics (Crimea2005), Yalta, Ukraine, September 10-17, 200
Organometalic carbosilane polymers containing vanadium and their preparation
The present invention concerns a new organometallic polymer material containing in part a vanadium-siloxane linkage (V-0-Si), which has excellent resistance to heat and oxidation and a high residue ratio after high temperature treatment in a non-oxidizing atmosphere, for example, nitrogen, argon, helium, ammonia, or hydrogen
Analytic Calculation of Neutrino Mass Eigenvalues
Implicaion of the neutrino oscillation search for the neutrino mass square
difference and mixing are discussed. We have considered the effective majorana
mass m_{ee}, related for \beta\beta_{0\nu}decay. We find limits for neutrino
mass eigen value m_{i} in the different neutrino mass spectrum,which explain
the different neutrino data.Comment: 10 page
On Distinguishing Non-Standard Interactions from Radiative Corrections in Neutrino-Electron Scattering
We present a contribution of higher order to neutrino-electron scattering
that is a charged-current counterpart of both the anomalous axial-vector
triangle and possible non-standard interaction contributions. It arises in the
standard model with massive neutrinos, and renormalizes the nondiagonal
axial-vector form-factor at low energies. We show that, due to the small size
of radiative corrections, the neutrino-electron scattering still provides a
discovery potential for some of the non-standard neutrino interactions proposed
in the literature.Comment: 9 pages, 3 figures, change in title and context of the consideration,
results of radiative corrections unchange
Neutrino Masses and Mixings in a Minimal SO(10) Model
We consider a minimal formulation of SO(10) Grand Unified Theory wherein all
the fermion masses arise from Yukawa couplings involving one 126 and one 10 of
Higgs multiplets. It has recently been recognized that such theories can
explain, via the type-II seesaw mechanism, the large \nu_\mu - \nu_\tau mixing
as a consequence of b-tau unification at the GUT scale. In this picture,
however, the CKM phase \delta lies preferentially in the second quadrant, in
contradiction with experimental measurements. We revisit this minimal model and
show that the conventional type-I seesaw mechanism generates phenomenologically
viable neutrino masses and mixings, while being consistent with CKM CP
violation. We also present improved fits in the type-II seesaw scenario and
suggest fully consistent fits in a mixed scenario.Comment: 27 pages, 13 eps figures, revtex4; references added, some minor
correction
Biquadratic antisymmetric exchange and the magnetic phase diagram of magnetoelectric CuFeO
Biquadratic {\it antisymmetric} exchange terms of the form , where is the
unit vector connecting sites and and , due partially to
magnetoelectric coupling effects, are shown to be responsible for the spin-flop
helical phase in CuFeO at low magnetic field and temperature. Usual
biquadratic {\it symmetric} exchange, likely due to magnetoelastic coupling, is
found to support the stability of axial magnetic states at higher fields in
this nearly-Heisenberg like stacked triangular antiferromagnet. A model
Hamiltonian which also includes substantial interplane and higher-neighbor
intraplane exchange interactions, reproduces the unique series of observed
commensurate and incommensurate periodicity phases with increasing applied
magnetic field in this highly frustrated system. The magnetic field-temperature
phase diagram is discussed in terms of a Landau-type free energy.Comment: 7 pages, 9 figure
Weak and Electromagnetic Nuclear Decay Signatures for Neutrino Reactions in SuperKamiokande
We suggest the study of events in the SuperKamiokande neutrino data due to
charged- and neutral-current neutrino reactions followed by weak and/or
electromagnetic decays of struck nuclei and fragments thereof. This study could
improve the prospects of obtaining evidence for production from oscillations and could augment the data sample used to disfavor
oscillations.Comment: 7 pages, latex, to appear in Phys. Rev. Let
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