arXiv subjects

U. Ozdem

Publications and source records attributed to U. Ozdem.

At least 19 recordsLinked to original sources

arXiv2026

Hidden-charm pentaquarks: Electromagnetic structure in a diquark--diquark--antiquark model

We systematically investigate the electromagnetic properties of exotic states whose internal structures remain uncertain and for which different models have been proposed. In this work, we focus on the magnetic dipole moments of hidden-charm pentaquark states using QCD light-cone sum rules with four distinct interpolating currents. The analysis accounts for contributions from both light and charm quark sectors, as well as higher-dimensional operators, ensuring convergence of the operator product expansion and dominance of the ground-state pole. Our results demonstrate a strong dependence of the magnetic moments on the internal quark configurations and spin alignments, revealing substantial variations among the different currents despite identical quark content and quantum numbers. Comparisons with existing studies indicate that while molecular-type predictions show general agreement, compact configurations yield markedly different values, including significant differences in sign and magnitude. These findings therefore underscore the sensitivity of electromagnetic observables to the internal structure of exotic hadrons and highlight their potential as probes to discriminate between competing structural models for spin-parity assignments and underlying quark dynamics.

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arXiv2023

Magnetic dipole moments of bottom-charm baryons in light-cone QCD

The magnetic dipole moments of the doubly-heavy baryons include significant data on their inner structure and geometric shape. Moreover, understanding the electromagnetic properties of doubly-heavy baryons is the key to confinement and heavy flavor effects. Inspired by this, we extract the magnetic dipole moments of the spin-$\frac{1}{2}$ bottom-charm baryons utilizing the QCD light-cone sum rule with considering the distribution amplitudes of the photon.The magnetic dipole moments are obtained as $μ_{Ξ_{bc}^{+}} = -0.50^{+0.14}_{-0.12}~μ_{N}$, $μ_{Ξ_{bc}^{0}} = 0.39^{+0.06}_{-0.05}~μ_{N}$ and $μ_{Ω_{bc}^{0}} = 0.38^{+0.05}_{-0.04} ~μ_{N}$, $μ_{Ξ_{bc}^{\prime +}} = 0.57^{+0.13}_{-0.12}~μ_{N}$, $μ_{Ξ_{bc}^{\prime 0}} =-0.29^{+0.07}_{-0.06}~μ_{N}$ and $μ_{Ω_{bc}^{\prime 0}} = -0.26^{+0.06}_{-0.05}~μ_{N}$. Comparing the results obtained on the magnetic dipole moments of the $Ω^{(\prime)0}_{bc}$ baryon with those of the $Ξ^{(\prime)0}_{bc}$ baryon, the $U$-symmetry is minimally broken. We have compared our results with other theoretical predictions that could be a useful complementary tool for the interpretation of the doubly-heavy baryon sector, and we observe that they are not in mutual agreement with each other.

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arXiv2022

Magnetic dipole moments of $B_{(s)}^{()}B_{(s)}^{()}$ states

We systematically study the magnetic dipole moments of multiquark states. In this study, the magnetic dipole moments of possible $B^- B^{*-}$, $B^0 B^{*-}$, $B^- B^{*0} $, $B^0 B^{*0}$, $B_s^0 B^{*-}$, $B^- B_s^{*0}$, $B_s^{0} B^{*0}$, $B^0 B_s^{*0}$ and $B^0_s B_s^{*0}$ states are extracted using light-cone sum rules. We explore magnetic dipole moments of these states as molecular picture with spin-parity $J^P = 1^+$. The magnetic dipole moments of hadrons include useful information on the distributions of internal charge and magnetization, which can be used to understand their geometrical shapes and quark-gluon organization. The results of the present study along with the spectroscopic parameters may help the future theoretical and experimental research on the characteristics of doubly-bottom tetraquark states.

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arXiv2022

Electromagnetic properties of doubly heavy pentaquark states

Motivated by the latest discovery of doubly-charmed tetraquark $T^+_{cc}$ by LHCb collaboration, we have studied the magnetic moments of the possible doubly-heavy pentaquark states with quantum numbers $J^P = 1/2^-$ and $J^P = 3/2^-$ within the light-cone sum rules method. In the analysis, these possible pentaquark states are considered in diquark-diquark-antiquark structure. The magnetic moments of hadrons encode helpful details about the distributions of the charge and magnetization inside the hadrons, which help us to figure out their geometric configurations. As a by product, the electric quadrupole and magnetic octupole moments of the spin-3/2 doubly-heavy pentaquark states are also extracted. These values show a non-spherical charge distribution. It will be interesting and useful to examine the magnetic moments of these possible doubly-heavy pentaquark states with different theoretical approaches.

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arXiv2022

Electromagnetic properties of the $ D \bar D^* K$ molecular hexaquark state

We systematically study the electromagnetic properties of multiquark states. In this study, inspired by the recent series of studies that showed the likely existence of a $ D \bar D^* K$ state, we examine the magnetic moment of $ D \bar D^* K$ hexaquark state in three-meson molecular structure, as well as having isospin and spin-parity quantum numbers $I(J^P) =3/2(1^-)$ via light-cone sum rules. The magnetic moment obtained for the $ D \bar D^* K$ molecular hexaquark state is quite large due to the double electric charge, and its magnitude indicates that it is accessible in future experiments. As a byproduct, the quadrupole moment of the $ D \bar D^* K$ molecular hexaquark state is also extracted. This value indicates a non-spherical charge distribution. The magnetic moments of hadrons contains valuable knowledge on the distributions of charge and magnetization their inside, which can be used to better understand their geometric shape and quark-gluon organizations. The results given in this study constitute an estimate of the magnetic moment of this $D \bar D^* K$ state and should serve as an inspiration to conduct experimental examinations of this state.

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arXiv2022

Magnetic moments of the vector hidden-charmed tetraquark states

The magnetic moments of the vector hidden-charmed tetraquark states that have been observed and can be expected to be observed experimentally have been determined using the light-cone sum rules taking into account the diquark-antidiquark structure with the quantum numbers $ J^{PC} = 1^{--}$ and $ J^{PC} = 1^{-+}$. Since these states are considered to have different flavors of light quarks, they have nonzero magnetic moments. The results obtained in this study can be checked for consistency by various methods. The magnetic moments of hadrons encompass useful knowledge about the distribution of charge and magnetization inside hadrons, which helps us to understand their geometrical shapes.

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arXiv2022

Magnetic moments of the doubly charged axial-vector $T_{cc}^{++}$ states

Motivated by the discovery of the doubly-charmed state $T^+_{cc}$ and with the help of light-cone sum rules, the magnetic moments of possible $T_{cc}^{++}$ states are calculated. While calculating the magnetic moments of these states, these particles are considered in the molecular picture and they have $J^P = 1^+$ quantum numbers. The magnetic moment results obtained for the $T_{cc}^{++}$ states are large due to the double electric charge. The results obtained in this study can be checked using other theoretical models. The magnetic moments of the hadrons reveal valuable knowledge about the size and the shape of the hadrons. Measurement of the magnetic moment of the $T_{cc}^{++}$ states in future experimental collaborations can be very useful to understanding substructure and identification the quantum numbers of these states.

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arXiv2022

Magnetic moment of the $Ξ_b(6227)$ as a molecular pentaquark state

In this study, considering that the $Ξ_b (6227)$ state is in molecular structure, the magnetic moment of this state is extracted in the light-cone QCD sum rules. The numerical result is obtained as $μ_{Ξ_b}= 0.12 \pm 0.03~μ_N$. The magnetic moment of this state contains important information of its internal structure and shape deformations. Measurement of the magnetic moment of the $Ξ_b(6227)$ state in future experimental facilities can be very helpful in identification of the quantum numbers, as well as comprehension of the inner structure of this state.

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arXiv2021

Magnetic dipole moments of the $Z_{c}(4020)^+$, $Z_{c}(4200)^+$, $Z_{cs}(4000)^{+}$ and $Z_{cs}(4220)^{+}$ states in light-cone QCD

The magnetic dipole moments of the $Z_{c}(4020)^+$, $Z_{c}(4200)^+$, $Z_{cs}(4000)^{+}$ and $Z_{cs}(4220)^{+}$ states are extracted in the framework of the light-cone QCD sum rules. In the calculations, we use the hadronic molecular form of interpolating currents, and photon distribution amplitudes to get the magnetic dipole moment of $Z_{c}(4020)^+$, $Z_{c}(4200)^+$, $Z_{cs}(4000)^{+}$ and $Z_{cs}(4220)^{+}$ tetraquark states. The magnetic dipole moments are obtained as $μ_{Z_{c}} = 0.66^{+0.27}_{-0.25}$, $μ_{Z^{1}_{c}}=1.03^{+0.32}_{-0.29}$, $μ_{Z_{cs}}=0.73^{+0.28}_{-0.26}$, $μ_{Z^1_{cs}}=0.77^{+0.27}_{-0.25}$ for the $Z_{c}(4020)^+$, $Z_{c}(4200)^+$, $Z_{cs}(4000)^{+}$ and $Z_{cs}(4220)^{+}$ states, respectively. We observe that the results obtained for the $Z_{c}(4020)^+$, $Z_{c}(4200)^+$, $Z_{cs}(4000)^{+}$ and $Z_{cs}(4220)^{+}$ states are large enough to be measured experimentally. As a by product, we predict the magnetic dipole moments of the neutral $Z_{cs}(4000)$ and $Z_{cs}(4220)$ states. The results presented here can serve to be helpful knowledge in experimental as well as theoretical studies of the properties of hidden-charm tetraquark states with and without strangeness.

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arXiv2020

Magnetic dipole moments of the spin-$\frac{3}{2}$ doubly heavy baryons

The magnetic dipole moments of the spin-$\frac{3}{2}$ doubly charmed, bottom and charmed-bottom baryons are obtained by means of the light-cone QCD sum rule. The magnetic dipole moments of these baryons encode essential knowledge of their inner structure and shape deformations. The numerical results are given as, $μ_{Ξ_{cc}^{*++}} = 2.94 \pm 0.95$, $μ_{Ξ_{cc}^{*+}} = - 0.67 \pm 0.11$, $μ_{Ω_{cc}^{*+}} =- 0.52 \pm 0.07$, $μ_{Ξ_{bb}^{*0}} = 2.30 \pm 0.55$, $μ_{Ξ_{bb}^{*-}} = -1.39 \pm 0.32$, $μ_{Ω_{bb}^{*-}} = -1.56 \pm 0.33$, $μ_{Ξ_{bc}^{*+}} = 2.63 \pm 0.82$, $μ_{Ξ_{bc}^{*0}} = - 0.96 \pm 0.32$ and $μ_{Ω_{bc}^{*+}} =- 1.11 \pm 0.33$, respectively.

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arXiv2020

Nucleon's energy-momentum tensor form factors in light-cone QCD

We use the energy-momentum tensor (EMT) current to compute the EMT form factors of the nucleon in the framework of the light cone QCD sum rule formalism. In the calculations, we employ the most general form of the nucleon's interpolating field and use the distribution amplitudes (DAs) of the nucleon with two sets of the numerical values of the main input parameters entering the expressions of the DAs. The directly obtained results from the sum rules for the form factors are reliable at $ Q^2\geq1~GeV^2 $: To extrapolate the results to include the zero momentum transfer squared with the aim of estimation of the related static physical quantities, we use some fit functions for the form factors. The numerical computations show that the energy-momentum tensor form factors of the nucleon can be well fitted to the multipole fit form. We compare the results obtained for the form factors at $ Q^2=0 $ with the existing theoretical predictions as well as experimental data on the gravitational form factor d$_1^q(0)$. For the form factors M$_2^q (0)$ and J$^q(0)$ a consistency among the theoretical predictions is seen within the errors: Our results are nicely consistent with the Lattice QCD and chiral perturbation theory predictions. However, there are large discrepancies among the theoretical predictions on d$_1^q(0)$. Nevertheless, our prediction is in accord with the JLab data as well as with the results of the Lattice QCD, chiral perturbation theory and KM15-fit. Our fit functions well define most of the JLab data in the interval $ Q^2\in[0,0.4]~GeV^2 $, while the Lattice results suffer from large uncertainties in this region. As a by-product, some mechanical properties of the nucleon like the pressure and energy density at the center of nucleon as well as its mechanical radius are also calculated and their results are compared with other existing theoretical predictions.

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arXiv2019

Magnetic moments of doubly heavy baryons in light-cone QCD

The magnetic dipole moments of the spin-$\frac{1}{2}$ doubly heavy baryons are extracted in the framework of light-cone QCD sum rule. The electromagnetic properties of the doubly heavy baryons encodes important information of their internal structure. The results for the magnetic dipole moments of doubly heavy baryons acquired in this work are compared with the predictions of the other theoretical approaches.

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arXiv2018

The electromagnetic multipole moments of the possible charm-strange pentaquarks in light-cone QCD

We investigate the electromagnetic properties of possible charm-strange pentaquarks in the framework of the light-cone QCD sum rule using the photon distribution amplitudes. In particular, by calculating the corresponding electromagnetic form factors defining the radiative transitions under consideration we estimate the magnetic dipole and electric quadrupole moments of the pentaquark systems of a charm, an anti-strange and three light quarks. We observe that the values of magnetic dipole moments are considerably large, however, the quadrupole moments are very small. Any future measurements of the electromagnetic parameters under consideration and comparison of the obtained data with the theoretical predictions can shed light on the quark-gluon organization as well as the nature of the pentaquarks.

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arXiv2018

Electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark in light-cone QCD

We calculate the electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark by modeling it as the diquark-diquark-antiquark and $\bar D^*Σ_c$ molecular state with quantum numbers $J^P = \frac{3}{2}^-$. In particular, the magnetic dipole, electric quadrupole and magnetic octupole moments of this particle are extracted in the framework of light-cone QCD sum rule. The values of the electromagnetic multipole moments obtained via two pictures differ substantially from each other, which can be used to pin down the underlying structure of $P_c^+(4380)$. The comparison of any future experimental data on the electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark with the results of the present work can shed light on the nature and inner quark organization of this state.

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arXiv2018

The electromagnetic multipole moments of the charged open-flavor $Z_{\bar cq}$ states

The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are investigated by assuming a diquark-antidiquark picture for their internal structure and quantum numbers $J^{PC} = 1^{+-}$ for their spin-parity. In particular, their magnetic and quadrupole moments are extracted in the framework of light-cone QCD sum rule by the help of the photon distribution amplitudes. The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are important dynamical observables, which encode valuable information on their underlying structure. The results obtained for the magnetic moments of different structures are considerably large and can be measured in future experiments. We obtain very small values for the quadrupole moments of $Z_{\bar cq}$ states indicating a nonspherical charge distribution.

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arXiv2018

Magnetic dipole moment of $Z_b(10610)$ in light-cone QCD

The magnetic dipole moment of the exotic $Z_b(10610)$ state is calculated within the light cone QCD sum rule method using the diquark-antidiquark and molecule interpolating currents. The magnetic dipole moment is obtained as $μ_{Z_b}=1.73\pm 0.63~μ_N$ in diquark-antidiquark picture and $μ_{Z_b}=1.59\pm 0.58~μ_N$ in the molecular case. The obtained results in both pictures together with the results of other theoretical studies on the spectroscopic parameters of the $Z_b(10610)$ state may be useful in determination of the nature and quark organization of this state.

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arXiv2017

Magnetic and quadrupole moments of the $Z_c(3900)$

The electromagnetic properties of the tetraquark state $Z_c(3900)$ are investigated in the diquark-antidiquark picture and its magnetic and quadrupole moments are extracted. To this end, the light-cone QCD sum rule in electromagnetic background field is used. The magnetic and quadrupole moments encode the spatial distributions of the charge and magnetization in the particle. The result obtained for the magnetic moment is quite large and can be measured in future experiments. We obtain a nonzero but small value for the quadrupole moment of $Zc(3900)$ indicating a nonspherical charge distribution.

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arXiv2016

Tensor form factors of the octet hyperons in QCD

Light-cone QCD sum rules to leading order in QCD are used to investigate the tensor form factors of the $Σ-Σ$, $Ξ-Ξ$ and $ Σ-Λ$ transitions in the range $1 GeV^2 \leq Q^2 \leq 10 GeV^2$. The DAs of $Σ$, $Ξ$ and $Λ$ baryon have been calculated without higher order terms. Then, study including higher order corrections have been done for $Σ$ and $Λ$ baryon. The result of form factors are obtained using these two DAs. We make a comparison with the predictions of the chiral quark soliton model.

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