1,799 research outputs found
Analysis of Quark Mixing Using Binary Tetrahedral Flavor Symmetry
Using the binary tetrahedral group , the three angles and phase of the
quark CKM mixing matrix are pursued by symmetry-breaking which involves
-doublet VEVs and the Chen-Mahanthappa CP-violation mechanism. The
NMRTM, Next-to-Minimal-Renormalizable -T-Model is described, and
its one parameter comparison to experimental data is explored.Comment: 14 pages latex. Two .eps figures include
Simplified Renormalizable Model for Tribimaximal Mixing and Cabibbo Angle
In a simplified renormalizable model where the neutrinos have PMNS
(Pontecorvo-Maki-Nakagawa-Sakata) mixings tan and with flavor symmetry there is a
corresponding prediction where the quarks have CKM (Cabibbo-Kobayashi-Maskawa)
mixings tan.Comment: Further typos correcte
LHC Higgs Production and Decay in the T' Model
At TeV, the standard model needs at least
integrated luminosity at LHC to make a definitive discovery of the Higgs boson.
Using binary tetrahedral () discrete flavor symmetry, we discuss how the
decay of the lightest Higgs into can be effectively
enhanced and dominate over its decay into . Since the two-photon
final state allows for a clean reconstruction, a decisive Higgs discovery may
be possible at 7 TeV with the integrated luminosity only of .Comment: 17 pages, 9 figure
Impact of neutrino flavor oscillations on the neutrino-driven wind nucleosynthesis of an electron-capture supernova
Neutrino oscillations, especially to light sterile states, can affect the
nucleosynthesis yields because of their possible feedback effect on the
electron fraction (Ye). For the first time, we perform nucleosynthesis
calculations for neutrino-driven wind trajectories from the neutrino-cooling
phase of an 8.8 Msun electron-capture supernova, whose hydrodynamic evolution
was computed in spherical symmetry with sophisticated neutrino transport and
whose Ye evolution was post-processed by including neutrino oscillations both
between active and active-sterile flavors. We also take into account the
alpha-effect as well as weak magnetism and recoil corrections in the neutrino
absorption and emission processes. We observe effects on the Ye evolution which
depend in a subtle way on the relative radial positions of the sterile MSW
resonances, of collective flavor transformations, and on the formation of alpha
particles. For the adopted supernova progenitor, we find that neutrino
oscillations, also to a sterile state with eV-mass, do not significantly affect
the element formation and in particular cannot make the post-explosion wind
outflow neutron rich enough to activate a strong r-process. Our conclusions
become even more robust when, in order to mimic equation-of-state dependent
corrections due to nucleon potential effects in the dense-medium neutrino
opacities, six cases with reduced Ye in the wind are considered. In these
cases, despite the conversion of active neutrinos to sterile neutrinos, Ye
increases or is not significantly lowered compared to the values obtained
without oscillations and active flavor transformations. This is a consequence
of a complicated interplay between sterile-neutrino production,
neutrino-neutrino interactions, and alpha-effect.Comment: 19 pages, 12 figures; accepted for publication by Ap
Off-diagonal Gluon Mass Generation and Infrared Abelian Dominance in Maximally Abelian Gauge in SU(3) Lattice QCD
In SU(3) lattice QCD formalism, we propose a method to extract gauge fields
from link-variables analytically. With this method, we perform the first study
on effective mass generation of off-diagonal gluons and infrared Abelian
dominance in the maximally Abelian (MA) gauge in the SU(3) case. Using SU(3)
lattice QCD, we investigate the propagator and the effective mass of the gluon
fields in the MA gauge with U(1)_3 \timesU(1)_8 Landau gauge fixing. The
Monte Carlo simulation is performed on at =5.7, 5.8 and 6.0 at
the quenched level. The off-diagonal gluons behave as massive vector bosons
with the approximate effective mass in the region of fm, and the propagation is
limited within a short range, while the propagation of diagonal gluons remains
even in a large range. In this way, infrared Abelian dominance is shown in
terms of short-range propagation of off-diagonal gluons. Furthermore, we
investigate the functional form of the off-diagonal gluon propagator. The
functional form is well described by the four-dimensional Euclidean Yukawa-type
function with
for fm. This also indicates that the spectral function of
off-diagonal gluons has the negative-value region
Vacuum solutions of five dimensional Einstein equations generated by inverse scattering method
We study stationary and axially symmetric two solitonic solutions of five
dimensional vacuum Einstein equations by using the inverse scattering method
developed by Belinski and Zakharov. In this generation of the solutions, we use
five dimensional Minkowski spacetime as a seed. It is shown that if we restrict
ourselves to the case of one angular momentum component, the generated solution
coincides with a black ring solution with a rotating two sphere which was found
by Mishima and Iguchi recently.Comment: 10 pages, accepted for publication in Physical Review
Rotating Black Holes on Kaluza-Klein Bubbles
Using the solitonic solution generating techniques, we generate a new exact
solution which describes a pair of rotating black holes on a Kaluza-Klein
bubble as a vacuum solution in the five-dimensional Kaluza-Klein theory. We
also investigate the properties of this solution. Two black holes with topology
S^3 are rotating along the same direction and the bubble plays a role in
holding two black holes. In static case, it coincides with the solution found
by Elvang and Horowitz.Comment: 16 pages, 1 figure, minor correctio
First-principles study on scanning tunneling microscopy images of hydrogen-terminated Si(110) surfaces
Scanning tunneling microscopy images of hydrogen-terminated Si(110) surfaces
are studied using first-principles calculations. Our results show that the
calculated filled-state images and local density of states are consistent with
recent experimental results, and the empty-state images appear significantly
different from the filled-state ones. To elucidate the origin of this
difference, we examined in detail the local density of states, which affects
the images, and found that the bonding and antibonding states of surface
silicon atoms largely affect the difference between the filled- and empty-state
images.Comment: 4 pages, and 4 figure
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