Yasemin Sarac

Semileptonic transition of

We use distribution amplitudes of the light

\Sigma_{b}

Sigma

to

baryon and the most general form of the interpolating current for heavy

\Sigma

Sigma_b

in Light Cone QCD Sum Rules

baryon to investigate the semileptonic

An analysis of f0–σ mixing in light cone QCD sum rules

Sigma_brightarrow Sigma l^+l^-

QCD sum rules for the anticharmed pentaquark

transition in light cone QCD sum rules. We calculate all twelve form factors responsible for this transition and use them to evaluate the branching ratio of the considered channel. The order of branching fraction shows that this channel can be detected at LHC.

Strong couplings of negative and positive parity nucleons to the heavy baryons and mesons

Abstract We investigate f 0 –σ mixing in the framework of light cone QCD sum rules and by employing the experimental results about the decay widths and the masses of these scalar mesons we estimate the scalar mixing angle by using σ meson data and f 0 meson data. The two values we thus obtain of the scalar mixing angle are not entirely consistent with each other, possibly indicating that the structure of these mesons cannot be simple quark–antiquark states.

κK*0γ-vertex in light cone QCD sum rules

We present a QCD sum rule analysis for the anticharmed pentaquark state with and without strangeness. While the sum rules for most of the currents are either nonconvergent or dominated by the DN continuum, the one for the nonstrange pentaquark current composed of two diquarks and an antiquark is convergent and has a structure consistent with a positive-parity pentaquark state after subtracting out the DN continuum contribution. Arguments are presented on the similarity between the result of the present analysis and that based on the constituent quark models, which predict a more stable pentaquark state when the antiquark is heavy.

Scalar \(a_0\)-meson contributions to radiative \(\omega\rightarrow \pi^{0}\eta\gamma\) and \(\rho^{0}\rightarrow \pi^{0}\eta\gamma\) decays

The strong coupling form factors related to the strong vertices of the positive and negative parity nucleons with the heavy