The masses of tetraquark states all $qc\overline{q}\overline{c}$ and $cc\overline{c}\overline{c}$ quark configurations are evaluated in a constituent model, where the Cornell-like potential one-gluon exchange spin-spin coupling employed. All model parameters predetermined by comparing theoretical experimental light, charmed bottom mesons. predictions charmoniumlike tetraquarks compared with observed $XYZ$ states, one tentative assignment is suggested. work suggests that $X(6900)$ LHCb likely...

$P_c$ resonances are studied in the approach of quark model and group theory. It is found that there totally 17 possible pentaquark states with contents $q^3Q \bar Q$ ($q$ $u$ $d$ quarks; $Q$ $c$ quark) compact picture, where hidden heavy may take color singlet-singlet ($[111]_{{qqq}}\otimes [111]_{{c c}}$) octet-octet ($[21]_{{qqq}}\otimes [21]_{{c configurations. The partial decay widths calculated for all channels. results show $pJ/\psi$ dominant channel both spin $3/2$ $1/2$ states,...

We calculate the masses and leptonic decay widths of bottomonium <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>b</a:mi><a:mover accent="true"><a:mi>b</a:mi><a:mo stretchy="false">¯</a:mo></a:mover></a:math> charmonium <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>c</e:mi><e:mover accent="true"><e:mi>c</e:mi><e:mo stretchy="false">¯</e:mo></e:mover></e:math> states in a constituent quark model where Cornell-like potential...

We present an analysis of strong two-body decays the $a_1(1420)$ with $J^{PC} = 1^{++}$ recently reported by COMPASS Collaboration at CERN. Following interpretation that $a_1$ is unusual state a four-quark $q\bar q s \bar s$ structure we consider two possible configurations for this --- hadronic molecular and color diquark-antidiquark structures. find dominant decay mode into $K$ $K^*$. In particular, calculate four modes $a_1 \to VP$ $VP K^{*\pm}K^\mp$, $K^{*0}\bar K^0$, $\bar K^{*0}K^0$...

We study pentaquark states of both light ${q}^{4}\overline{q}$ and hidden heavy ${q}^{3}Q\overline{Q}$ ($\mathrm{q}=\mathrm{u},\mathrm{d},\mathrm{s}$ quark in SU(3) flavor symmetry; $\mathrm{Q}=\mathrm{c}$, b quark) systems with a general group theory approach the constituent model, spectrum baryon resonances ansatz that $l=1$ may consist ${q}^{3}$ as well component. The model is fitted to ground state baryons which are believed be normal three-quark states. work reveals...

Permutation groups are applied to analyze the symmetries of pentaquark states. All possible quark configurations color, flavor, spin, and spatial degrees freedom worked out in language permutation groups, corresponding wave functions constructed systematically form a Yamanouchi basis. The various symmetries, which derived harmonic-oscillator interaction, as complete bases evaluate low-lying light ${q}^{4}\overline{q}$ mass all configurations, where Cornell-like potential is employed.

We study the axial transition form factors ${G}_{A}^{B\ensuremath{\rightarrow}{B}^{\ensuremath{'}}}({Q}^{2})$ as well charges ${g}_{A}^{B\ensuremath{\rightarrow}{B}^{\ensuremath{'}}}$ of octet baryons in perturbative chiral quark model (PCQM) with including both ground and excited states intermediate propagators. The PCQM results on are found good agreement existing experimental data lattice-QCD values. figures out that for all transitions behave dipolelike form, which is dominantly caused...

We calculate the masses of $qq\bar q\bar q$ tetraquark ground state and first radial excited in a constituent quark model where Cornell-like potential one-gluon exchange spin-spin coupling are employed. The three parameters for proposed mass-dependent accordance with Lattice QCD data, all predetermined by studying light, charmed bottom mesons. theoretical predictions light tetraquarks compared observed exotic meson states light-unflavored sector, tentative assignments suggested. work...

The $\Lambda$ baryon spectrum is studied within the SU(3) flavor symmetry in a constituent quark model. We found that it rather difficult to accommodate some negative-parity resonances as single $q^2s$ ($q = u,\,d$ quarks) states conventional three-quark picture. ground $q^3s\bar q$ pentaquark mass evaluated and possible interpretation proposed work: observed $\Lambda(1405)1/2^{-}$, $\Lambda(1670)1/2^{-}$ $\Lambda(1800)1/2^{-}$ are three-state mixtures of two $p$-wave one state, so...

Using the perturbative chiral quark model (PCQM), we investigate and predict in this work axial charges ${g}_{A}^{B}$ of octet decuplet $N$, $\mathrm{\ensuremath{\Sigma}}$, $\mathrm{\ensuremath{\Xi}}$, $\mathrm{\ensuremath{\Delta}}$, ${\mathrm{\ensuremath{\Sigma}}}^{*}$, ${\mathrm{\ensuremath{\Xi}}}^{*}$ baryons, considering both ground excited states propagator. The PCQM predictions are good agreement with experimental data, lattice-QCD values, other approaches. In addition, study reveals...

Partial decay widths of the are evaluated in 3P0 quark model, assuming a charmonium scenario for its structure. In study all model parameters predetermined by other reactions. The work reveals that it is difficult to accommodate with any meson state picture potential plus dynamics.

Permutation groups are applied to analyze the symmetries of multiquark systems and wave functions pentaquark states constructed systematically in language Yamanouchi basis. We estimate mass baryons constituent quark model with one-gluon-exchange interaction, assuming that consist q 3 component as well [Formula: see text] component.

We systematically study hidden charm pentaquark states in the constituent quark model with a general Hamiltonian for multiquark systems, considering coupling between <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi mathvariant="normal">Σ</a:mi><a:mi>c</a:mi><a:mrow><a:mo stretchy="false">(</a:mo><a:mo>*</a:mo><a:mo stretchy="false">)</a:mo></a:mrow></a:msubsup><a:msup><a:mover accent="true"><a:mi>D</a:mi><a:mo...

We study the photoproduction of $N(1440)$ resonance in $\gamma^*p\to N^*$ process quark models, where takes different wave functions: first radial excitation nucleon imported from low-lying baryon mass spectrum calculations, a general nucleon, and $q^3$ state with positive parity. The comparison between theoretical results experimental data on helicity amplitudes $A_{1/2}$ $S_{1/2}$ analysis spatial function reveal that is mainly excitation.

Partial decay widths of the $X(3940)$ are evaluated in $^3P_0$ quark model, assuming a charmonium scenario for its structure. In study all model parameters predetermined by other reactions. The work reveals that it is difficult to accommodate with any $c\bar c$ meson state picture potential plus dynamics.

We calculate the masses and leptonic decay widths of bottomonium $b\bar b$ charmonium $c\bar c$ states in a constituent quark model where Cornell-like potential spin-dependent interaction are employed, with all parameters predetermined by studying ground first radial excited S- P-wave heavy quarkonium mesons. By comparing theoretical predictions for $J^{PC}=1^{--}$ experimental data considering possible mixtures $nS$ $(n-1)D$ states, we provide tentative assignments observed quarkonia. The...

We systematically study hidden charm pentaquark states in the constituent quark model with a general Hamiltonian for multiquark systems, considering coupling between $\Sigma_c^{(*)}\bar{D}^{(*)}$ molecular and $q^3c\bar c$ compact by one-gluon exchange hyperfine interaction. The ground state hidden-charm mass spectra strong decay widths are calculated. This work suggests that $P_c(4312)$, $P_c(4457)$ $P_c(4380)$ resonances might be mainly $\Sigma_c \bar D$, D^*$ $\Sigma_c^* D$ hadronic...

We study first the box-diagram contribution to $γp\,\rightarrow \,K^0Σ^+$ process understand anomaly of kaon photoproduction cross section from CBELSA/TAPS experiment at Electron Stretcher Accelerator (ELSA), where imaginary part scattering amplitude box-diagrams is calculated by using Cutkosky's rules in on-shell approximation while real derived dispersion relation calculations. Together with results K-MAID model, fails provide sudden drop differential cross-section between $K^*\,Λ$ and...