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Zhi-Gang Wang

Publications and source records attributed to Zhi-Gang Wang.

At least 235 records · Page 13Linked to original sources
arXiv2013

Analysis of the vector and axialvector $B_c$ mesons with QCD sum rules

In this article, we study the vector and axialvector $B_c$ mesons with the QCD sum rules, and make reasonable predictions for the masses and decay constants, then calculate the leptonic decay widths. The present predictions for the masses and decay constants can be confronted with the experimental data in the future. We can also take the masses and decay constants as basic input parameters and study other phenomenological quantities with the three-point vacuum correlation functions via the QCD sum rules.

hep-ph↗
arXiv2012

Analysis of mass modifications of the vector and axial-vector heavy mesons in the nuclear matter with the QCD sum rules

In this article, we calculate the mass modifications of the vector and axial-vector mesons $D^*$, $B^*$, $D_1$ and $B_1$ in the nuclear matter with the QCD sum rules, and obtain the mass-shifts $δM_{D^*}=-71 \rm{MeV}$, $δM_{B^*}=-380 \rm{MeV}$, $δM_{D_1}=72 \rm{MeV}$, $δM_{B_1}=264 \rm{MeV}$, and the scattering lengths $a_{D^*}=-1.07 \rm{fm}$, $a_{B^*}=-7.17 \rm{fm}$, $a_{D_1}=1.15 \rm{fm}$ and $a_{B_1}=5.03 \rm{fm}$ for the $D^*N$, $B^*N$, $D_1N$ and $B_1N$ interactions, respectively.

hep-ph↗
arXiv2012

The $B_c$-decays $B_c^+ \to J/ψπ^+π^-π^+$, $η_c π^+π^-π^+ $

In this article, we study the three-pion $B_c$-decays $B_c^+ \to J/ψ\, π^+π^-π^+$, $η_c\, π^+π^-π^+ $ with dominance of the intermediate axial-vector meson $a_1(1260)$ and vector meson $ρ(770)$ in the $π^+π^-π^+$ and $π^+π^-$ invariant mass distributions respectively, and make predictions for the branching fractions and differential decay widths. The ratio between the decays $B_c^+ \to J/ψ\, π^+π^-π^+$ and $B_c^+ \to J/ψ\, π^+ $ is compatible with the experimental data within uncertainties, other predictions can be confronted with the experimental data in the future at the LHCb.

hep-ph↗
arXiv2012

Analysis of the triply heavy baryon states with QCD sum rules

In this article, we study the ${1\over 2}^{\pm}$ and ${3\over 2}^{\pm}$ triply heavy baryon states in an systematic way by subtracting the contributions from the corresponding ${1\over 2}^{\mp}$ and ${3\over 2}^{\mp}$ triply heavy baryon states with the QCD sum rules, and make reasonable predictions for their masses.

hep-ph↗
arXiv2012

Analysis of the radiative decays among the bottomonium states

In this article, we perform an systematic study of the radiative transitions among the bottomonium states based on the heavy quarkonium effective theory, and make predictions for the ratios among the radiative decay widths of a special multiplet to another multiplet. The predictions can be confronted with the experimental data in the future.

hep-ph↗
arXiv2012

Analysis of the doubly heavy baryons in the nuclear matter with the QCD sum rules

In this article, we study the doubly heavy baryon states $Ξ_{cc}$, $Ω_{cc}$, $Ξ_{bb}$ and $Ω_{bb}$ in the nuclear matter using the QCD sum rules, and derive three coupled QCD sum rules for the masses, vector self-energies and pole residues. The predictions for the mass-shifts in the nuclear matter $ΔM_{Ξ_{cc}}=-1.11\,\rm{GeV}$, $ΔM_{Ω_{cc}}=-0.33\,\rm{GeV}$, $ΔM_{Ξ_{bb}}=-3.37\,\rm{GeV}$ and $ΔM_{Ω_{bb}}=-1.05\,\rm{GeV}$ can be confronted with the experimental data in the future.

hep-ph↗
arXiv2012

Analysis of the $Σ_Q$ baryons in the nuclear matter with the QCD sum rules

In this article, we extend our previous work to study the $Σ$-type heavy baryons $Σ_c$ and $Σ_b$ in the nuclear matter using the QCD sum rules, and obtain three coupled QCD sum rules for the masses $M_{Σ_Q}^*$, vector self-energies $Σ_v$ and pole residues $λ^*_{Σ_Q}$ in the nuclear matter. Then we take into account the effects of the unequal pole residues from different spinor structures, and normalize the masses from the QCD sum rules in the vacuum to the experimental data, and obtain the mass-shifts $δM_{Σ_c}=-123\,\rm{MeV}$ and $δM_{Σ_b}=-375\,\rm{MeV}$ in the nuclear matter.

hep-ph↗
arXiv2012

Analysis of the $B \to K^*_0(1430), a_0(1450)$ form-factors with light-cone QCD sum rules

In this article, we take the scalar mesons $K^*_0(1430)$ and $a_0(1450)$ as the conventional two-quark states, and study the $B \to K^*_0(1430), a_0(1450)$ form-factors with the $B$-meson light-cone QCD sum rules, then take those form-factors as basic input parameters to study the semi-leptonic decays $\bar{B}^0\to a_0^+(1450)l \barν_l $ and $B^-\to K_0^{*-}(1430)l\bar{l}$, the predictions can be confronted with the experimental data in the future.

hep-ph↗
arXiv2011

Analysis of the $Λ_Q$ baryons in the nuclear matter with the QCD sum rules

In this article, we study the $Λ_c$ and $Λ_b$ baryons in the nuclear matter using the QCD sum rules, and obtain the in-medium masses $M_{Λ_c}^*=2.335\,\rm{GeV}$, $M_{Λ_b}^*=5.678\,\rm{GeV}$, the in-medium vector self-energies $Σ^{Λ_c}_v=34\,\rm{MeV}$, $Σ^{Λ_b}_v=32\,\rm{MeV}$, and the in-medium pole residues $λ_{Λ_c}^*=0.021\,\rm{GeV}^3$, $λ_{Λ_b}^*=0.026\,\rm{GeV}^3$. The mass-shifts are $M_{Λ_c}^*-M_{Λ_c}=51\,\rm{MeV}$ and $M_{Λ_b}^*-M_{Λ_b}=60\,\rm{MeV}$, respectively.

hep-ph↗
arXiv2011

Analysis of the radiative decays among the charmonium states

In this article, we study the radiative decays among the charmonium states with the heavy quark effective theory, and make predictions for the ratios among the radiative decay widths of an special multiplet to another multiplet. The predictions can be confronted with the experimental data in the future and put additional constraints in identifying the $X$, $Y$, $Z$ charmonium-like mesons.

hep-ph↗
arXiv2011

Analysis of the vector meson transitions among the heavy quarkonium states

In this article, we study the vector meson transitions among the charmonium and bottomonium states with the heavy quark effective theory in an systematic way, and make predictions for the ratios among the vector meson decay widths of a special multiplet to another multiplet. The predictions can be confronted with the experimental data in the future.

hep-ph↗
arXiv2011

Analysis of the Y(4274) with QCD sum rules

In this article, we assume that there exists a pseudoscalar $D_s{\bar D}_{s0}(2317)$ molecular state and study its mass with the molecule-type interpolating current in details using the QCD sum rules. The numerical result disfavors identifying the charmonium-like state Y(4274) as the $D_s{\bar D}_{s0}(2317)$ molecule.

hep-ph↗
arXiv2011

Analysis of the $B \to K^*_2(1430), a_2(1320), f_2(1270)$ form-factors with light-cone QCD sum rules

In this article, we study the $B \to K^*_2(1430)$, $a_2(1320)$, $f_2(1270)$ form-factors with the light-cone QCD sum rules, where the $B$-meson light-cone distribution amplitudes are used. In calculations, we observe that the line-shapes of the $B$-meson light-cone distribution amplitude $ϕ_+(ω)$ have significant impacts on the values of the form-factors, and expect to obtain severe constraints on the parameters of the $B$-meson light-cone distribution amplitudes from the experimental data in the future.

hep-ph↗
arXiv2011

In-medium mass modifications of the $D_0$ and $B_0$ mesons with the QCD sum rules

In this article, we calculate the in-medium mass modifications of the scalar mesons $D_0$ and $B_0$ using the QCD sum rules. In calculations, we observe that the $D_0N$ and $B_0N$ scattering lengths are about $1.1\,\rm{fm}$ and $4.1\,\rm{fm}$ respectively, the mass-shifts $δM_{D_0}=69\,\rm{MeV}$ and $δM_{B_0}=217\,\rm{MeV}$, and the $D_0N$ and $B_0N$ interactions are repulsive. The positive mass-shifts indicate that the decays of the higher charmonium states into the $D_0\bar{D}_0$ pair are suppressed.

hep-ph↗
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↗