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A. Ozpineci

Publications and source records attributed to A. Ozpineci.

At least 55 records · Page 3Linked to original sources
arXiv2008

QCD sum rules analysis of the $B_{s}\to D_{sJ}(2460)lν$ decay

Using three point QCD sum rules method, the form factors relevant to the semileptonic $B_{s}\to D_{sJ}(2460)\ellν$ decay are calculated. The $q^2$ dependencies of these form factors are evaluated. The dependence of the asymmetry parameter $α$, characterizing the polarization of $D_{sJ}$ meson, on $q^2$ is studied. This study gives useful information about the structure of the $D_{sJ}$ meson. Finally the branching ratio of this decay is also estimated and is shown that it can be easily detected at LHC.

hep-ph↗
arXiv2007

Meson-octet-baryon couplings using light cone QCD sum rules

The coupling constants of K and pi mesons with the octet baryons are studied in light cone QCD sum rules taking into account SU(3)f flavor symmetry breaking effects, but keeping the SU(2) isospin symmetry intact. It is shown that, in the SU(3)f flavor symmetry breaking case, all of the couplings can be written in terms of four universal functions instead of F and D couplings which exist in the SU(3)f symmetry case. A comparison of our results of kaon and pion-baryon couplings with existing theoretical and experimental results in the literature is performed.

hep-ph↗
arXiv2006

Semileptonic Bs ->DsJ(2460)l nu decay in QCD

Using three point QCD sum rules method, the form factors relevant to the semileptonic Bs ->DsJ (2460)l nu decay are calculated. The q2 dependence of these form factors is evaluated and compared with the heavy quark effective theory predictions. The dependence of the asymmetry parameter alpha, characterizing the polarization of DsJ meson, on q2 is studied .The branching ratio of this decay is also estimated and is shown that it can be easily detected at LHC.

hep-ph↗
arXiv2005

On the structure of $D_{sJ}^*(2317)$ and $D_{sJ}(2460)$

We discuss the structure of the narrow mesons with charm and strangeness $D_{sJ}^*(2317)$ and $D_{sJ}(2460)$, stressing the role of the radiative decay modes in shedding light on the quark content of these states. We argue that present experimental data favour the interpretation of the two states as ordinary $\bar c s$ mesons. We suggest the existence of resonances with similar properties and well predicted masses in the $\bar b s$ sector.

hep-ph↗
arXiv2005

Unitary Structure of the QCD Sum Rules and KYN and KYΞCouplings

New relations between QCD Borel sum rules for strong coupling constants of K-mesons to baryons are derived. It is shown that starting from the sum rule for the coupling constants $g_{πΣΣ}$ and $g_{πΣΛ}$ it is straightforward to obtain corresponding sum rules for the $g_{K Y N}$, $g_{K Y Ξ}$ couplings, $Y=Σ,Λ$.

hep-ph↗
arXiv2005

Radiative Decays of Decuplet to Octet Baryons in Light Cone QCD

The radiative decays of decuplet to octet baryons are analyzed within the light cone QCD sum rules framework.The electromagnetic transition form factors for these decays are calculated up to twist four accuracy for photon wave functions as well as including first order strange quark mass corrections. A comparison of our results with predictions of lattice theory and existing experimental data is presented.

hep-ph↗
arXiv2005

Radiative transitions of $D^*_{sJ}(2317)$ and $D_{sJ}(2460)$

We study radiative decays of $D^*_{sJ}(2317)$ and $D_{sJ}(2460)$ using light-cone QCD sum rules. In particular, we consider the decay modes $D^*_{sJ}(2317)\to D_s^* γ$ and $D_{sJ}(2460)\to D_s^{(*)} γ, D^*_{sJ}(2317) γ$ and evaluate the hadronic parameters in the transition amplitudes analyzing correlation functions of scalar, pseudoscalar, vector and axial-vector quark currents. In the case of $D^*_{sJ}(2317)\to D_s^* γ$ we also consider determinations based on two different correlation functions in HQET. The decay widths turn out to be different than previous estimates obtained by other methods; the results favour the interpretation of $D^*_{sJ}(2317)$ and $D_{sJ}(2460)$ as ordinary $\bar c s$ mesons.

hep-ph↗
arXiv2003

QCD Sum Rules: Intercrossed Relations for Sigma^0 and Lambda Magnetic Moments

New relations between QCD Borel sum rules for magnetic moments of Sigma^0 and Lambda hyperons are constructed. It is shown that starting from the sum rule for the Sigma^0 hyperon magnetic moment it is straightforward to obtain the corresponding sum rule for the Lambda hyperon magnetic moment et vice versa.

hep-ph↗
arXiv2003

Fourth generation effects in processes induced by "b -> s" transition

We study the effects of sequential fourth quark generation in rare "B -> K(K*) l^+ l^-" decays induced by "b -> s" transition and in "B_s^0 - bar{B}_s^0" mixing. Using the experimental values on branching ratios of the "B -> X_s gamma" and "B -> K(K*) l^+ l^-" decays, the allowed regions for $\vel V_{tb} V_{ts}^\ast\ver$ and "|V_{t'b} V_{t's}*| are determined as a function of the (t') quark mass.

hep-ph↗
arXiv2003

Meson-Baryon Couplings and the F/D ratio in Light Cone QCD

Using the general form of the baryon currents, we calculate the meson-baryon coupling constants and the F/D ratio within the framework of light cone QCD sum rules in the SU(3) flavor symmetry limit. The dependence of the results on the Dirac structure and on the free parameter (b) appearing in the general baryon current is considered. Comparison of our results on F/D ratio with the existing results is presented.

hep-ph↗
arXiv2003

Radiative (phi -> f_0(980) gamma) decay in light cone QCD sum rules

The light cone QCD sum rules method is used to calculate the transition form factor for the radiative (phi -> f_0 gamma) decay, assuming that the quark content of the (f_0) meson is pure (bar{s}s) state. The branching ratio is estimated to be Br(phi -> f_0 gamma) = 3.5 x (1 pm 0.3) x 10^(-4). A comparison of our prediction on branching ratio with the theoretical results and experimental data existing in literature is presented.

hep-ph↗
arXiv2003

The (Sigma_Q-Lambda_Q) transition magnetic moments in light cone QCD sum rules

Using the general form of (Sigma_Q) and (Lambda_Q) (Q=b or c) currents, (Sigma_Q-Lambda_Q) transition magnetic moments are calculated in framework of the light cone QCD sum rules method. In this approach nonperturbative effects are described by the photon wave functions and only two-particle photon wave functions are taken into account. Our predictions on transition magnetic moments are (mu_{Sigma_c Lambda_c} = - (1.5 pm 0.4) mu_N) and (mu_{Sigma_b Lambda_b} = - (1.6 pm 0.4) mu_N). A comparison of our results with the ones existing in the literature is given.

hep-ph↗
arXiv2003

Fourth generation effects in rare (B_s -> l^+ l^-) and (B_s -> l^+ l^- gamma) decays

The contribution of the fourth generation quarks to the rare (B_s -> l^+ l^-) and (B_s -> l^+ l^- gamma) decays are studied. Constraints on the extended Cabibbo-Kobayashi-Maskawa matrix elements |V_{tb} V_{ts}*| and |V_{t'b} V_{t's}*| are obtained from the existing experimental result for the branching ratio of the (B -> X_s gamma) decay. The branching ratios of the above-mentioned decays, as well as the photon spectrum in the (B_s -> l^+ l^- gamma) decay, are studied. It is found that the results are sensitive to the existence of the fourth generation.

hep-ph↗