Güray Erkol

The exclusive

We study the differential branching ratio, branching ratio and the forward-backward asymmetry for the exclusive

B\to \pi \ell^+ \ell^-

B \to \pi \ell^+ \ell^-

and

and

B\to \rho \ell^+ \ell^-

B \to \rho \ell^+ \ell^-

decays in the general two Higgs doublet model

decays in the general two Higgs doublet model including the neutral Higgs boson effects. We analyze the dependencies of these quantities on the neutral Higgs boson contributions and the other model parameters. We observe that two Higgs doublet model with the neutral Higgs boson exchanges gives quite sizable contributions to these observables for both channels we consider. Since the neutral Higgs boson exchanges are the only source of the forward-backward asymmetry for

Vector and axial-vector couplings of D and D⁎ mesons in 2+1 flavor lattice QCD

B \to \pi \tau^+ \tau^-

Electromagnetic structure of charmed baryons in lattice QCD

decay, which is at the order of magnitude

Electromagnetic properties of doubly charmed baryons in Lattice QCD

1-10%

Axial charges of octet baryons in two-flavor lattice QCD

, measurement of this observable is promising to determine the neutral Higgs boson effects.

Pseudoscalar-meson-octet-baryon coupling constants in two-flavor lattice QCD

Abstract Using the axial-vector coupling and the electromagnetic form factors of the D and D⁎ mesons in 2 + 1 flavor lattice QCD, we compute the D⁎Dπ, DDρ and D ⁎ D ⁎ ρ coupling constants, which play an important role in describing the charm hadron interactions in terms of meson-exchange models. We also extract the charge radii of D and D⁎ mesons and determine the contributions of the light and charm quarks separately.