Contributions of fermions to the mass of the scalar glueball 0++are calculated at two-loop level in theframework of QCD sum rules.It slightly changes the coefficients in the operator product expansion （OPE） and shif...Contributions of fermions to the mass of the scalar glueball 0++are calculated at two-loop level in theframework of QCD sum rules.It slightly changes the coefficients in the operator product expansion （OPE） and shiftsthe mass of glueball to 1.72 ± 0.07 GeV.展开更多
We systematically investigate the mass spectra of {Q}{^(('))s} molecular states in the framework of QCDsum rules.The interpolating currents representing the molecular states are proposed.Technically, contribut...We systematically investigate the mass spectra of {Q}{^(('))s} molecular states in the framework of QCDsum rules.The interpolating currents representing the molecular states are proposed.Technically, contributions of theoperators up to dimension six are included in operator product expansion (OPE).The masses for molecular states withvarious {Q}{^(('))s} configurations are presented.The result 4.36±0.08 GeV for the D_s~*_(s0)~* molecular state is consistentwith the mass 4350_(-5.1)^(+4.6)±0.7 MeV of the newly observed X(4350), which could support X(4350) interpreted as a D_s~*_(s0)~*molecular state.展开更多
We calculated the nucleon self-energies in iso-spin asymmetric nuclear matter and obtained the nuclear symmetry energy by taking difference of these of neutron and proton.We find that the scalar(vector) self-energy pa...We calculated the nucleon self-energies in iso-spin asymmetric nuclear matter and obtained the nuclear symmetry energy by taking difference of these of neutron and proton.We find that the scalar(vector) self-energy part gives a negative(positive) contribution to the nuclear symmetry energy,consistent with the result from relativistic mean-field theories.Also,we found exact four-quark operator product expansion for nucleon sum rule.Among them,twist-4 matrix elements which can be extracted from deep inelastic scattering experiment constitute an essential part in the origin of the nuclear symmetry energy from QCD.Our result also extends early success of QCD sum rule in the symmetric nuclear matter to the asymmetric nuclear matter.展开更多
In this article,we take the vector charmonium-like state Y(4660) as a Ψ'f_0(980) bound state (irrespective ofthe hadro-charmonium and the molecular state) tentatively,and study its mass using the QCD sum rules.Th...In this article,we take the vector charmonium-like state Y(4660) as a Ψ'f_0(980) bound state (irrespective ofthe hadro-charmonium and the molecular state) tentatively,and study its mass using the QCD sum rules.The numericalvalue M_Y = 4.71±0.26 GeV is consistent with the experimental data.Considering the SU(3) symmetry of the light flavorquarks and the heavy quark symmetry,we also study the bound states Ψ′σ(400-1200),γ′″ f_0(980),and γ′″σ(400-1200)with the QCD sum rules,and make reasonable predictions for their masses.展开更多
基金Supported by National Natural Science Foundation of China under Grant Nos.10775051,11075053Program for New Century Excellent Talents in University under Grant No.NCET-07-0282the Fundamental Research Funds for the Central Universities
基金Supported by the National Natural Science Foundation of China under Grant No.10775073the Special Grant for the Ph.D.Program of the Education Ministry of China under Grant No.20070055037
文摘Contributions of fermions to the mass of the scalar glueball 0++are calculated at two-loop level in theframework of QCD sum rules.It slightly changes the coefficients in the operator product expansion （OPE） and shiftsthe mass of glueball to 1.72 ± 0.07 GeV.
基金Supported by the National Natural Science Foundation of China under Grant Nos.10675167 and 10975184
文摘We systematically investigate the mass spectra of {Q}{^(('))s} molecular states in the framework of QCDsum rules.The interpolating currents representing the molecular states are proposed.Technically, contributions of theoperators up to dimension six are included in operator product expansion (OPE).The masses for molecular states withvarious {Q}{^(('))s} configurations are presented.The result 4.36±0.08 GeV for the D_s~*_(s0)~* molecular state is consistentwith the mass 4350_(-5.1)^(+4.6)±0.7 MeV of the newly observed X(4350), which could support X(4350) interpreted as a D_s~*_(s0)~*molecular state.
基金Supported by Korea national researchfoundation(Grants Nos.KRF-2011-0030621 and KRF-2011-0020333)
文摘We calculated the nucleon self-energies in iso-spin asymmetric nuclear matter and obtained the nuclear symmetry energy by taking difference of these of neutron and proton.We find that the scalar(vector) self-energy part gives a negative(positive) contribution to the nuclear symmetry energy,consistent with the result from relativistic mean-field theories.Also,we found exact four-quark operator product expansion for nucleon sum rule.Among them,twist-4 matrix elements which can be extracted from deep inelastic scattering experiment constitute an essential part in the origin of the nuclear symmetry energy from QCD.Our result also extends early success of QCD sum rule in the symmetric nuclear matter to the asymmetric nuclear matter.
基金Supported by Natural Science Foundation Project of CQ CSTC under Grant No.2008BB0298by Natural Science Foundation of China under Grant Nos.10805082 and 11075225by the Fundamental Research Funds for the Central Universities under Grant No.CDJZR101000616
基金Supported by National Natural Science Foundation under Grant No.10775051 Program for New Century Excellent Talents in University under Grant No.NCET-07-0282 Project Supported by Chinese Universities Scientific Fund
文摘In this article,we take the vector charmonium-like state Y(4660) as a Ψ'f_0(980) bound state (irrespective ofthe hadro-charmonium and the molecular state) tentatively,and study its mass using the QCD sum rules.The numericalvalue M_Y = 4.71±0.26 GeV is consistent with the experimental data.Considering the SU(3) symmetry of the light flavorquarks and the heavy quark symmetry,we also study the bound states Ψ′σ(400-1200),γ′″ f_0(980),and γ′″σ(400-1200)with the QCD sum rules,and make reasonable predictions for their masses.
