14 research outputs found
Radiative dileptonic decays of B-meson in the general two Higgs doublet model
We investigate the exclusive decay in the
general two Higgs doublet model (model III) including the neutral Higgs boson
effects with an emphasis on possible CP-violating effects. For this decay, we
analyse the dependencies of the forward-backward asymmetry of the lepton pair,
, CP-violating asymmetry, , and the CP-violating asymmetry in
forward-backward asymmetry, , on the model parameters and also
on the neutral Higgs boson effects. We have found that , and depending on the relative magnitude of the Yukawa couplings
and in the model III. We also
observe that these physical quantities are sensitive to the model parameters
and neutral Higgs boson effects are quite sizable for some values of the
coupling .Comment: 29 pages, 18 eps figures, requires appolb.cls (included
The analysis of decays in the standard model
We study the differential branching ratio, branching ratio and the
CP-violating asymmetry for the exclusive decays in the standard model. We deduce the form factors from the form factors of available in
the literature, by using the symmetry. We observe that these decay
modes, which are within the reach of forthcoming B-factories, are very
promising to observe CP-violation.Comment: 12 pages, 8 figures, version to appear in Eur.Phys.J.
Isovector axial-vector form factors of octet baryons in QCD
We compute the diagonal isovector axial-vector as well as induced
pseudoscalar form factors of nucleon, and baryons by employing
the light-cone QCD sum rules to leading order in QCD and including distribution
amplitudes up to twist 6. Extrapolating our sum-rules results to low-momentum
transfers, we make a comparison with experimental and lattice-QCD results where
we can achieve a nice qualitative and quantitative agreement.Comment: 9 pages, 3 figure
The exclusive decay in the two Higgs doublet models
We study the differential branching ratio, branching ratio and the
forward-backward asymmetry for the exclusive decay in
the two Higgs doublet model. We analyze the dependencies of these quantities on
the model parameters and show that these observables are highly sensitive to
new physics and hence may provide powerful probe of the SM and beyond.Comment: 14 pages, 6 figures, version to appear in Eur.Phys.J.
Pseudoscalar-meson-octet-baryon coupling constants in two-flavor lattice QCD
We evaluate the πΝΝ, π∑∑, πΛ∑, KΛN and K∑N coupling constants and the corresponding monopole masses in lattice QCD with two flavors of dynamical quarks. The parameters representing the SU(3)-flavor symmetry are computed at the point where the three quark flavors are degenerate at the physical s-quark mass. In particular, we obtain α ≡ F/(F+D) = 0.395(6). The quark-mass dependences of the coupling constants are obtained by changing the u- and the d-quark masses. We find that the SU(3)-flavor parameters have weak quark-mass dependence and thus the SU(3)-flavor symmetry is brokenby only a few percent at each quark-mass point we consider.publisher versio