arXiv subjects

Zhi-Gang Wang

Publications and source records attributed to Zhi-Gang Wang.

At least 253 records · Page 14Linked to original sources

arXiv2011

$B \to A$ transitions in the light-cone QCD sum rules with the chiral current

In this article, we calculate the form-factors of the transitions $B \to a_1(1260)$, $b_1(1235) $ in the leading-order approximation using the light-cone QCD sum rules. In calculations, we choose the chiral current to interpolate the $B$-meson, which has outstanding advantage that the twist-3 light-cone distribution amplitudes of the axial-vector mesons have no contributions, and the resulting sum rules for the form-factors suffer from much less uncertainties. Then we study the semi-leptonic decays $B \to a_1(1260) l\barν_l$, $b_1(1235) l\barν_l$ $(l=e,μ,τ)$, and make predictions for the differential decay widths and decay widths, which can be confronted with the experimental data in the coming future.

hep-ph↗

arXiv2011

Analysis of the nonet scalar mesons as tetraquark states with new QCD sum rules

In this article, we take the scalar diquarks as point particles and describe them as basic quantum fields, then introduce the SU(3) color gauge interaction and new vacuum condensates to study the nonet scalar mesons as tetraquark states with the QCD sum rules. Comparing with the conventional quark currents, the diquark currents have the outstanding advantage to satisfy the two criteria of the QCD sum rules more easily.

hep-ph↗

arXiv2011

Analysis of the decays $ψ^{\prime}\to {J/ψ}π^+π^-$ and $η_c^{\prime}\to {η_c}π^+π^-$ with the heavy quark symmetry

In this article, we study the decays $ψ^{\prime}\to {J/ψ}π^+π^-$ and $η_c^{\prime}\to {η_c}π^+π^-$ by taking into account the chiral symmetry breaking effects, the final-state interactions and the heavy quark symmetry. We can confront the predictions of the $η_c^{\prime}\to η_c π^+π^-$ decay width and differential decay width with the experimental data in the future, and obtain powerful constraints on the chiral breaking effects and the final-state interactions, and test the heavy quark symmetry.

hep-ph↗

arXiv2011

Analysis of the ${1/2^-}$ and ${3/2^-}$ heavy and doubly heavy baryon states with QCD sum rules

In this article, we study the ${(1/2)^-}$ and ${(3/2)^-}$ heavy and doubly heavy baryon states $Σ_Q({(1/2)^-})$, $Ξ'_Q({(1/2)^-})$, $Ω_Q({(1/2)^-})$, $Ξ_{QQ}({(1/2)^-})$, $Ω_{QQ}({(1/2)^-})$, $Σ_Q^*({(3/2)^-})$, $Ξ_Q^*({(3/2)^-})$, $Ω_Q^*({(3/2)^-})$, $Ξ^*_{QQ}({(3/2)^-})$ and $Ω^*_{QQ}({(3/2)^-})$ by subtracting the contributions from the corresponding ${1\over 2}^+$ and ${3\over 2}^+$ heavy and doubly heavy baryon states with the QCD sum rules in a systematic way, and make reasonable predictions for their masses.

hep-ph↗

arXiv2011

Analysis of mass difference of the $π$ and $ρ$ with Bethe-Salpeter equation

In this article, we take into account the one-pion exchange force besides the one-gluon exchange force to study the mass difference of the $π$ and $ρ$ mesons with the Bethe-Salpeter equation. After projecting the Bethe-Salpeter equation into an simple form, we can see explicitly that the bound energy $|E_π|\gg |E_ρ|$.

hep-ph↗

arXiv2011

Experimental study of THGEM detector with mini-rim

The gas gain and energy resolution of single and double THGEM detectors (5{\times}5cm2 effective area) with mini-rims (rim is less than 10μm) were studied. The maximum gain can reach 5{\times}103 and 2{\times}105 for single and double THGEM respectively, while the energy resolution of 5.9 keV X-ray varied from 18% to 28% for both single and double THGEM detectors of different hole sizes and thicknesses.All the experiments were investigated in mixture of noble gases(argon,neon) and small content of other gases(iso-butane,methane) at atmospheric pressure.

physics.ins-det↗

arXiv2011

Analysis of the X(1835) and related baryonium states with Bethe-Salpeter equation

In this article, we study the mass spectrum of the baryon-antibaryon bound states $p\bar{p}$, $Σ\barΣ$, $Ξ\barΞ$, $Λ\barΛ$, $p\bar{N}(1440)$, $Σ\barΣ(1660)$, $Ξ\barΞ^\prime$ and $Λ\barΛ(1600)$ with the Bethe-Salpeter equation. The numerical results indicate that the $p\bar{p}$, $Σ\barΣ$, $Ξ\barΞ$, $p\bar{N}(1440)$, $Σ\barΣ(1660)$, $Ξ\barΞ^\prime$ bound states maybe exist, and the new resonances X(1835) and X(2370) can be tentatively identified as the $p\bar{p}$ and $p\bar{N}(1440)$ (or $N(1400)\bar{p}$) bound states respectively with some gluon constituents, and the new resonance X(2120) may be a pseudoscalar glueball. On the other hand, the Regge trajectory favors identifying the X(1835), X(2120) and X(2370) as the excited $η^\prime(958)$ mesons with the radial quantum numbers $n=3$, 4 and 5, respectively.

hep-ph↗

arXiv2010

Analysis of the vertexes $Ω^_QΩ_Q^ϕ$, $Ω^_QΞ_Q^K^$, $Ξ_Q^Σ^_QK^$ and $Σ_Q^Σ^_Q ρ$ with the light-cone QCD sum rules

In this article, we parameterize the vertexes $Ω^*_QΩ_Q^*ϕ$, $Ω^*_QΞ_Q^*K^*$, $Ξ_Q^*Σ^*_QK^*$ and $Σ_Q^*Σ^*_Q ρ$ with four tensor structures due to Lorentz invariance, and study the corresponding four strong coupling constants with the light-cone QCD sum rules.

hep-ph↗

arXiv2010

Analysis of strong decays of the charmed mesons D(2550), D(2600), D(2750) and D(2760)

In this article, we study the strong decays of the newly observed charmed mesons $D(2550)$, $D(2600)$, $D(2750)$ and $D(2760)$ with the heavy quark effective theory in the leading order approximation, and tentatively identify the $(D(2550),D(2600))$ as the $2S$ doublet $(0^-,1^-)$ and the $(D(2750),D(2760))$ as the $1D$ doublet $(2^-,3^-)$, respectively. The identification of the $D(2750)$ and $D(2760)$ as the same particle with $J^P=3^-$ is disfavored.

hep-ph↗

arXiv2010

Analysis of the scalar and axial-vector heavy diquark states with QCD sum rules

In this article, we study the mass spectrum of the scalar and axial-vector heavy diquark states with the QCD sum rules in a systematic way. Once the reasonable values are obtained, we can take them as basic parameters and study the new charmonium-like states as the tetraquark states.

hep-ph↗

arXiv2010

Analysis of the scalar doubly heavy tetraquark states with QCD sum rules

In this article, we perform a systematic study of the mass spectrum of the scalar doubly charmed and doubly bottom tetraquark states using the QCD sum rules.

hep-ph↗

arXiv2010

Analysis of the $X(1835)$ as a baryonium state with Bethe-Salpeter equation

In this article, we take the X(1835) as a pseudoscalar baryonium state, and calculate the mass spectrum of the baryon-antibaryon bound states $p\bar{p}$, $Σ\barΣ$, $Ξ\barΞ$, and $Λ\barΛ$ in the framework of the Bethe-Salpeter equation with a phenomenological potential. The numerical results indicate the $p\bar{p}$, $Σ\barΣ$ and $Ξ\barΞ$ bound states maybe exist, and the $X(1835)$ can be tentatively identified as the $p\bar{p}$ bound state.

hep-ph↗

arXiv2010

Mass spectrum of the axial-vector hidden charmed and hidden bottom tetraquark states

In this article, we perform a systematic study of the mass spectrum of the axial-vector hidden charmed and hidden bottom tetraquark states using the QCD sum rules, and identify the $Z^+(4430)$ as an axial-vector tetraquark state tentatively.

hep-ph↗

arXiv2010

Analysis of the X(4350) as a scalar $\bar{c}c$ and ${D}_s^\ast {\bar {D}}_s^\ast$ mixing state with QCD sum rules

In this article, we assume that the narrow structure X(4350) is a scalar $\bar{c}c-{D}_s^\ast {\bar {D}}_s^\ast$ mixing state, and study its mass using the QCD sum rules. The numerical result $M_X=(4.37\pm0.15)\,\rm{GeV}$ is in good agreement with the experimental data, the X(4350) may be a scalar $\bar{c}c-{D}_s^\ast {\bar {D}}_s^\ast$ mixing state. Other possibility, such as a scalar (tensor) $cs\bar{c}\bar{s}$ tetraquark state is not excluded.

hep-ph↗

arXiv2010

Analysis of the ${1\over 2}^{\pm}$ flavor antitriplet heavy baryon states with QCD sum rules

In this article, we study the masses and pole residues of the ${1\over 2}^\pm$ flavor antitriplet heavy baryon states ($Λ_c^+$, $Ξ_c^+,Ξ_c^0)$ and ($Λ_b^0$, $Ξ_b^0,Ξ_b^-)$ by subtracting the contributions from the corresponding ${1\over 2}^\mp$ heavy baryon states with the QCD sum rules, and observe the masses are in good agreement with the experimental data and make reasonable predictions for the unobserved ${1\over 2}^-$ bottom baryon states. Once reasonable values of the pole residues $λ_Λ$ and $λ_Ξ$ are obtained, we can take them as basic parameters to study the revelent hadronic processes with the QCD sum rules.

hep-ph↗

arXiv2010

Analysis of the ${1\over 2}^+$ doubly heavy baryon states with QCD sum rules

In this article, we study the ${1\over 2}^+$ doubly heavy baryon states $Ω_{QQ}$ and $Ξ_{QQ}$ by subtracting the contributions from the corresponding ${1\over 2}^-$ doubly heavy baryon states with the QCD sum rules, and make reasonable predictions for their masses. Those doubly heavy baryon states maybe observed at the Tevatron, the LHCb and the PANDA.

hep-ph↗

arXiv2010

Analysis of the ${3\over 2}^+$ heavy and doubly heavy baryon states with QCD sum rules

In this article, we study the ${3\over 2}^+$ heavy and doubly heavy baryon states $Ξ^*_{cc}$, $Ω^*_{cc}$, $Ξ^*_{bb}$, $Ω^*_{bb}$, $Σ_c^*$, $Ξ_c^*$, $Ω_c^*$, $Σ_b^*$, $Ξ_b^*$ and $Ω_b^*$ by subtracting the contributions from the corresponding ${3\over 2}^-$ heavy and doubly heavy baryon states with the QCD sum rules, and make reasonable predictions for their masses.

hep-ph↗

arXiv2010

Analysis of the vertexes $Ξ_Q^Ξ'_Q V$, $Σ_Q^Σ_Q V$ and radiative decays $Ξ_Q^\to Ξ'_Q γ$, $Σ_Q^\to Σ_Q γ$

In this article, we study the vertexes $Ξ_Q^*Ξ'_Q V$ and $Σ_Q^* Σ_Q V$ with the light-cone QCD sum rules, then assume the vector meson dominance of the intermediate $ϕ(1020)$, $ρ(770)$ and $ω(782)$, and calculate the radiative decays $Ξ_Q^*\to Ξ'_Q γ$ and $Σ_Q^*\to Σ_Q γ$.

hep-ph↗