In this article, we assume that there exist the pseudoscalar D■s0*(2317) and D*■s1*(2460) molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with...In this article, we assume that there exist the pseudoscalar D■s0*(2317) and D*■s1*(2460) molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formulaμ =(MX/Y/Z2 -(2 Mc)2)1/2 to determine the energy scales of the QCD spectral densities. The numerical results, MZ1=4.61-0.08+0.11 GeV and MZ2= 4.60-0.06+0.07 GeV, which lie above the D■s0*(2317) and D*■s1*(2460) thresholds respectively,indicate that the D■s0*(2317) and D*■s1*(2460) are difficult to form bound state molecular states, the Z1,2 are probably resonance states.展开更多
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 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 expansion.Our 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.展开更多
基金Supported by National Natural Science Foundation of China under Grant No.11775079
文摘In this article, we assume that there exist the pseudoscalar D■s0*(2317) and D*■s1*(2460) molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formulaμ =(MX/Y/Z2 -(2 Mc)2)1/2 to determine the energy scales of the QCD spectral densities. The numerical results, MZ1=4.61-0.08+0.11 GeV and MZ2= 4.60-0.06+0.07 GeV, which lie above the D■s0*(2317) and D*■s1*(2460) thresholds respectively,indicate that the D■s0*(2317) and D*■s1*(2460) are difficult to form bound state molecular states, the Z1,2 are probably resonance states.
基金supported by National Natural Science Foundation,Grant Number 11775079.
文摘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 expansion.Our 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.
