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...

An amorphous Al2O3 (a-Al2O3)/MoS2 interface has attracted much attention because of its unique properties. In this study, the behaviors under non-strain and biaxial strain are investigated by first principles calculations based on density functional theory. First all, generation process a-Al2O3 sample is described molecular dynamics. The calculated bandgap 3.66 eV for generalized gradient approximation-Perdew, Burke, Ernzerhof 5.26 Heyd-Scuseria-Ernzerhof functional. Then, we give a detailed...

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...

The axial form factor as well the charge of octet baryons are studied in perturbative chiral quark model (PCQM) with wave functions predetermined by fitting theoretical results proton to experimental data. found, based on functions, good agreement data and lattice values. This may indicate that electric distributions constituent quarks same. study reveals meson cloud plays an important role baryons, contributing 30%-40% total values, strange sea have a considerable contribution $\Sigma$ $\Xi$.

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...

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...

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.

The approximately analytical bound state solutions of the arbitrary l-wave Klein–Gordon and k-state Dirac equations for mixed hyperbolical potentials are carried out by taking a proper approximate expansion centrifugal term. radial wavefunctions presented corresponding energy derived. Two special cases equation discussed briefly.

Within the isospin- and momentum-dependent transport model IBUU11, we examine relativistic retardation effects of electrical fields on ${\ensuremath{\pi}}^{\ensuremath{-}}/{\ensuremath{\pi}}^{+}$ ratio neutron-proton differential transverse flow in heavy-ion collisions at intermediate energies. Compared to static Coulomb fields, retarded electric fast-moving charges are known be anisotropic associated corrections can significant. They found increase number energetic protons participant...

By a simple algebraic approach we study the exact solution to Dirac equation with scalar and vector trigonometric Scarf potentials in case of spin symmetry. The transcendental energy spinor wave functions are presented. It is found that there exist only positive bound states Also, eigenvalue approaches constant when potential parameter α goes zero. equally studied briefly.

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...

The electromagnetic properties of baryon octet are studied in the perturbative chiral quark model (PCQM). relativistic wave function is extracted by fitting theoretical results proton charge form factor to experimental data and predetermined applied study factors other baryons as well magnetic moments, radii. PCQM found, based on function, good agreement with data.

We investigate the interface behaviors of Y2O3/GaAs under biaxial strain, triaxial and non-strain conditions. This study is performed by first principles calculations based on density functional theory (DFT). First all, strain realized changing lattice constants in ab plane. Averaged electrostatic potential (AEP) aligned establishing Y2O3 GaAs (110) surfaces. The band offsets are investigated generalized gradient approximation Heyd–Scuseria–Ernzerhof (HSE) functionals. suitable for design...

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...