The electromagnetic form factors of the spin-3/2 Ω baryons, namely Ω, Ω * c , Ω * cc and Ωccc, are calculated in full QCD on 32 3 × 64 PACS-CS lattices with a pion mass of 156(9) MeV. The electric charge radii and magnetic moments from the E0 and M 1 multipole form factors are extracted. Results for the electric quadrupole form factors, E2, are also given. Quark sector contributions are computed individually for each observable and then combined to obtain the baryon properties. We find that the charm quark contributions are systematically smaller than the strange-quark contributions in the case of the charge radii and magnetic moments. E2 moments of the Ω * cc and Ωccc provide a statistically significant data to conclude that their electric charge distributions are deformed to an oblate shape. Properties of the spin-1/2 Ωc and Ωcc baryons are also computed and a thorough comparison is given. This complete study gives valuable hints about the heavy-quark dynamics in charmed hadrons.

As a continuation of our recent work on the electromagnetic properties of the doubly charmed Ξ cc baryon, we compute the charge radii and the magnetic moments of the singly charmed Σ c , Ω c and the doubly charmed Ω cc baryons in 2+1 flavor Lattice QCD. In general, the charmed baryons are found to be compact as compared to the proton. The charm quark acts to decrease the size of the baryons to smaller values. We discuss the mechanism behind the dependence of the charge radii on the light valence-and sea-quark masses. The magnetic moments are found to be almost stable with respect to changing quark mass. We investigate the individual quark sector contributions to the charge radii and the magnetic moments. The magnetic moments of the singly charmed baryons are found to be dominantly determined by the light quark and the role of the charm quark is significantly enhanced for the doubly charmed baryons.

We evaluate the strangeness-conserving N N , ΣΣ, ΞΞ, ΛΣ and the strangeness-changing ΛN , ΣN , ΛΞ, ΣΞ axial charges in lattice QCD with two flavors of dynamical quarks and extend our previous work on pseudoscalar-meson-octet-baryon coupling constants so as to include πΞΞ, KΛΞ and KΣΞ coupling constants. We find that the axial charges have rather weak quark mass dependence and the breaking in SU(3)-flavor symmetry is small at each quark-mass point we consider.

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.

We compute the electromagnetic properties of Ξcc baryons in (2+1)-flavor Lattice QCD. By measuring the electric charge and magnetic form factors of Ξcc baryons, we extract the magnetic moments, charge and magnetic radii as well as the ΞccΞccρ coupling constant, which provide important information to understand the size, shape and couplings of the doubly charmed baryons. We find that the two heavy charm quarks drive the charge radii and the magnetic moment of Ξcc to smaller values as compared to those of, e.g., the proton.TÜBİTAK ; KAKENH