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Chinese Physics C 2021年第6期45卷 37-55页

作者： Zhigang Wang Huijuan Wang Qi Xin Department of Physics North China Electric Power UniversityBaoding 071003China

In this article,we illustrate how to calculate the hadronic coupling constants of the pentaquark states with qcd sum rules based on rigorous quark-hadron *** then study the hadronic coupling constants of the lowest diquark-diquark-antiquark type hidden-charm pentaquark state with spin-parity J^(P)=1^(1)/2in detail,and calculate the partial decay *** total widthτ(Pc)=14:32±3:31 MeV is compatible with the experimental valueτP_(c)(4312)=9:8±±2:7^(+3:7)_(-4:5)MeV from the LHCb collaboration,and favors assigning P_(c)(4312)the to be the pentaquark state with J^(P)=1^(1)/*** hadronic coupling constants have the relation|G_(PD)++∑_(c)^(++)|=√2|GPD^(0)Σ_(c)^(+)|≫|G_(PD^(0))_(c)^(+)|,and favor the hadronic dressing *** P_(c)(4312)may have a diquark-diquark-antiquark type pentaquark core with the typical size of the-type baryon *** strong couplings to the meson-baryon pairsD_(c)lead to some pentaquark molecule components,and the P_(c)(4312)may spend a rather large time as the molecular state.

关键词： pentaquark states qcd sum rules XYZ particles

Analysis of the strong decays of Pc(4312)as a pentaquark molecular state with qcd sum rules

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Chinese Physics C 2020年第10期44卷 29-40页

作者： Zhi-Gang Wang Xu Wang Department of Physics North China Electric Power UniversityBaoding 071003China

Abstract:In this article,we tentatively assign Pc(4312)to be the^ˉDΣc pentaquark molecular state with the spin-parity JP=12−,and discuss the factorizable and non-factorizable contributions in the two-point qcd sum rules for the^ˉDΣc molecular state in detail to prove the reliability of the single pole approximation in the hadronic spectral *** study its two-body strong decays with the qcd sum rules,and special attention is paid to match the hadron side with the qcd side of the correlation functions to obtain solid *** obtain the partial decay widthsΓ(Pc(4312)→ηcp)=0.255MeV andΓ(Pc(4312)→J/ψp)=9.296+19.542−9.296MeV,which are compatible with the experimental value of the total width,and support assigning Pc(4312)to be the^ˉDΣc pentaquark molecular state.

关键词： pentaquark molecular states qcd sum rules XYZ particles

Ground states and first radial excitations of vector tetraquark states with explicit P-waves via qcd sum rules

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Chinese Physics C 2024年第10期48卷 40-47页

作者： Zhi-Gang Wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this study,we chose the diquark-antidiquark type four-quark cuents with an explicit P-wave betweenthe diquark and antidiquark pairs to study the ground states and first radial exeitations of the hidden-charm *** states with quantum numbers J^(PC)=1^(--).We also obtained the lowest vector tetraguark masses and made *** assignments of the existing Ystates,There indeed exists a hidden-charm tetraquark state with J^(PC)=1^(--) at anenergy of approximately 4.75 GeV as the first radial exeitation that accounts for the BESIII data.

关键词： tetraguark state qcd sum rules

Analysis of the excited Ω_(c) states as the 1/2^(±) pentaquark states with qcd sum rules

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Communications in Theoretical Physics 2021年第3期73卷 78-93页

作者： Hui-Juan Wang Zun-Yan Di Zhi-Gang Wang Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Sicence and Engineering North China Electric Power UniversityBeijing 102206China

We construct both the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type interpolating currents to study the charmed pentaquark:states suscu with J^(p)=1/2^(±).We employ the qcd sum rules to investigate the masses and pole residues of the charmed pentaquark states by taking into account the vacuum condensates up to dimension 13 in the operator product *** calculation results indicate that the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type charmed pentaquark states suscu with J^(p)=1/2^(-) can be possible candidates of the excited states observed in the LHCb collaboration.

关键词： charmed baryon states charmed pentaquark states qcd sum rules

The Λ-type P-wave bottom baryon states via the qcd sum rules

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Chinese Physics C 2023年第9期47卷 73-85页

作者：辛琦王志刚吕菲 Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

Our study focuses on the Λ-type P-wave bottom baryon states with spin-parity JP=1/2−, 3/2−. We introduce an explicit P-wave between the two light quarks in the interpolating currents (these light quarks are antisymmetric in the flavor space, thus giving rise to the designation of Λ-type baryon) to investigate the Λb and Ξ_(b) states within the framework of the full qcd sum rules. The predicted masses show that Ξ_(b)(6087) and Ξ_(b)(6095/6100) could be the P-wave bottom-strange baryon states with spin-parity JP=1/2− and 3/2−, respectively;meanwhile, Λb(5912) and Λb(5920) could be the P-wave bottom baryon states with spin-parity JP=1/2− and 3/2−, respectively. Moreover, Λb(5920) and Ξ_(b)(6095/6100) may have two remarkable under-structures or Fock components at least.

关键词： bottom baryon states qcd sum rules P-wave

0^(--) hidden-heavy tetraquark states via qcd sum rules

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Chinese Physics C 2024年第9期48卷 50-59页

作者： Bing-Dong Wan Hong-Tai Xu Department of Physics Liaoning Normal UniversityDalian 116029China Center for Theoretical and Experimental High Energy Physics Liaoning Normal UniversityDalian 116029China

In this study,we evaluated the mass spectra of the prospective 0^(--) hidden-charm and hidden-bottom tetraquark states in molecular configuration via qcd sum *** our calculation,the nonperturbative condensate contributions are considered up to dimension eight in operator product *** is found that there could exist 4possible 0^(--) hidden-charm tetraquark states with masses(4.68±0.07),(4.22±0.09),(4.53±0.09),and(4.26±0.13) *** corresponding hidden-bottom partners are found lying at(11.04±0.10),(10.71±0.12),(11.09±0.10),and(11.82±0.14) GeV,*** possible tetraquark decay modes were analyzed,which are expected to be measured in BESⅢ,BELLEⅡ,and LHCb experiments.

关键词： exotic hadronic states qcd sum rules tetraquarks

Analysis of the 1S and 2S states of Λ_(Q) and Ξ_(Q) with qcd sum rules

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Chinese Physics C 2021年第1期45卷 109-118页

作者： Zhi-Gang Wang Hui-Juan Wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this article,we study the ground states and the first radial excited states of the flavor antitriplet heavy baryon states ∧Q and ΞQ with the spin-parity JP=1/2+ by carrying out operator product expansion up to vacuum condensates of dimension 10 in a consistent *** observe for the first time that the higher dimensional vacuum condensates play an important role,and obtain very stable qcd sum rules with variations of the Borel parameters for the heavy baryon *** predicted masses 6.08±0.09 GeV,2.78±0.08 GeV,and 2.96±0.09 GeV for the first radial excited states ∧b(2 S),∧c(2 S),and Ξc(2 S),respectively,are in excellent agreement with the experimental data and support assigning ∧b(6072),∧c(2765),and Ξc(2980/2970) to be the first radial excited states of ∧b,∧c,and Ξc,*** predicted mass 6.24±0.07 GeV for Ξb(2 S) can be confirmed using experimental data in the future.

关键词： heavy baryon states qcd sum rules

NLO effects for Ω_(QQQ) baryons in qcd sum rules

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Chinese Physics C 2021年第9期45卷 44-54页

作者： Ren-Hua Wu Yu-Sheng Zuo Ce Meng Yan-Qing Ma Kuang-Ta Chao School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

We study the triply heavy baryonsΩ_(QQQ)(Q=c,b)in the qcd sum rules by performing the first calculation of the next-to-leading order(NLO)contribution to the perturbative qcd part of the correlation *** with the leading order(LO)result,the NLO contribution is found to be very important to theΩ_(QQQ).This is because the NLO not only results in a large correction but also reduces the parameter dependence,making the Borel platform more distinct,especially for the Q_(bbb)in the MS scheme,where the platform appears only at NLO but not at ***,owing to the inclusion of the NLO contribution,the renormalization schemes(MS and On-Shell)dependence and the scale dependence are significantly ***,after including the NLO contribution to the perturbative part in the qcd sum rules,the masses are estimated to be 4.53_)0.11)^(+0.26) GeV forΩ_(ccc) and14.27_(-0.32)^(+0.33) GeV forΩ_(bbb),where the results are obtained atμ=M_(B) with errors including those from the variation of the renormalization scaleμin the range(0.8-1.2)M_(B).A careful study of theμdependence in a wider range is further performed,which shows that the LO results are very sensitive to the choice ofμwhereas the NLO results are considerably *** addition to theμ=M_(B) result,a more stable value,(4.75-4.80)GeV,for theΩ_(ccc) mass is found in the range ofμ=(1.2-2.0)M_(B),which should be viewed as a more relevant prediction in our NLO approach because of μ dependence.

关键词： baryon heavy quark qcd sum rules NLO correction

B_(c) meson and its scalar cousin with qcd sum rules

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Chinese Physics C 2024年第10期48卷 48-58页

作者： Zhi-Gang Wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this study,we use the optical theorem to calculate the next-to-leading order corrections to the qcd spectral densities directly in the qcd sum rules for the pseudoscalar and scalar B_(c) *** use experimental data for guidance to perform an updated *** obtain the masses and,in particular,decay constants,which are the fundamental input parameters in high energy ***,we obtain the pure leptonic decay widths,which can be compared with experimental data in the future.

关键词： next-to-leading order contributions qcd sum rules

Heavy flavor baryon spectra via qcd sum rules

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Chinese Physics C 2009年第12期33卷 1385-1388页

作者：张建荣黄明球 Department of Physics National University of Defense Technology

In this talk, we give a short review of our recent works on studying the singly heavy baryon, doubly heavy baryon, and triply heavy baryon Spectra from qcd sum rules.

关键词： singly heavy baryon doubly heavy baryon triply heavy baryon qcd sum rules