The structure of H dihyperon(DH)is investigated by employing the SU(3)chiral quark model.As the structure of DH,two different conHguations,six-quark cluster configuration and two-cluster configuration,are considered,r...The structure of H dihyperon(DH)is investigated by employing the SU(3)chiral quark model.As the structure of DH,two different conHguations,six-quark cluster configuration and two-cluster configuration,are considered,respectively.The result shows that except the a chiral Held,the overall effect of the other SU(3)chiral fields is destructive in forming a stable DH and the two-cluster configuration is the preferred structure.The resultant mass of DH in a three-coupled-channel calculation in the SU(3)chiral quark model is ranged from 2225 to 2234 MeV.展开更多
The effect of higher dimensional quark-gluon condensates on the effective quark-antiquark potential is investigated.In this scenario,cc and bb spectra are studied.It is shown that the vacuum condensates of the d=5 and...The effect of higher dimensional quark-gluon condensates on the effective quark-antiquark potential is investigated.In this scenario,cc and bb spectra are studied.It is shown that the vacuum condensates of the d=5 and d=6 operators,where d denotes the dimension of the operator,still cause notable effects.The perturbative loop contributions from the s-channel scattering and t-channel annihilation processes to the potential are almost the same.These contributions are opposite in sign to the non-perturbative contributions of the d=4 operator condensates.展开更多
A more realistic non-relativistic quark-quark potential in the thermal and dense medium is proposed and used to study the laptonic decay of J/ψ.The laptonic decay property of J/ψin the hot and dense matter depends o...A more realistic non-relativistic quark-quark potential in the thermal and dense medium is proposed and used to study the laptonic decay of J/ψ.The laptonic decay property of J/ψin the hot and dense matter depends on the form of the binding potential.The decay width in the potential case is much sensitive to the temperature than that in the Karsch’s potential case,especially in the lower temperature region.In both cases,the decay widths decreased with the increasing temperature and density.The resultant critical temperature of 200 MeV is consistent with the lattice quantum chromodynamics finding.展开更多
The N-N interaction t«studied tn the framework of non-relativistic quark model using the resonating group method(RGM).The △△ channel is taken into account in addition to the NN channel.The calculated S-wave pha...The N-N interaction t«studied tn the framework of non-relativistic quark model using the resonating group method(RGM).The △△ channel is taken into account in addition to the NN channel.The calculated S-wave phase shifts show that the channel coupling effect is increased if the quadratic or the linear confinement is replaced by the flat-bottom-linear confinement.This result is quite different from that in the case of the quadratic confinement or the linear confinement,in which this channel coupling effect is negligible.展开更多
Nucleon-nucleon interaction is studied in the non-relativistic quark model with a flat bottom linear confinement potential.The results are consistent with the calculated ones from the lattice quantum chromodynamics.Th...Nucleon-nucleon interaction is studied in the non-relativistic quark model with a flat bottom linear confinement potential.The results are consistent with the calculated ones from the lattice quantum chromodynamics.The quark-quark interaction also consists of those caused by the one gluon exchange and the one pion exchange.The phenomenological sigma meson exchange between two nucleons is also included to fit the S-wave N-N scattering data.The calculated NN channel S-wave phase shifts show that the flat bottom linear confinement potential can provide part of the medium range attraction.展开更多
By taking advantage of the model-independent nuclear parton distributions, the structure functions xF3（x, Q^2） are calculated, in comparison with the experimental data from CCFR neutrino-nuclei charge current deep i...By taking advantage of the model-independent nuclear parton distributions, the structure functions xF3（x, Q^2） are calculated, in comparison with the experimental data from CCFR neutrino-nuclei charge current deep inelastic scattering. It is shown that shadowing and anti-shadowing effects occur in valence quark distributions for small and medium x regions, respectively. It is suggested that the neutrino experimental data should be employed in the future for pinning down the nuclear patton distributions.展开更多
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.1977551B and B15,and Chinese Academy of Sciences under Grant Nos.B78 and B80.
文摘The structure of H dihyperon(DH)is investigated by employing the SU(3)chiral quark model.As the structure of DH,two different conHguations,six-quark cluster configuration and two-cluster configuration,are considered,respectively.The result shows that except the a chiral Held,the overall effect of the other SU(3)chiral fields is destructive in forming a stable DH and the two-cluster configuration is the preferred structure.The resultant mass of DH in a three-coupled-channel calculation in the SU(3)chiral quark model is ranged from 2225 to 2234 MeV.
基金the National Natural Science Foundation of China under Grant No.1977551Bthe Chinese Academy of Sciences under Grant No.B78.
文摘The effect of higher dimensional quark-gluon condensates on the effective quark-antiquark potential is investigated.In this scenario,cc and bb spectra are studied.It is shown that the vacuum condensates of the d=5 and d=6 operators,where d denotes the dimension of the operator,still cause notable effects.The perturbative loop contributions from the s-channel scattering and t-channel annihilation processes to the potential are almost the same.These contributions are opposite in sign to the non-perturbative contributions of the d=4 operator condensates.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19675044 and 1977551B.
文摘A more realistic non-relativistic quark-quark potential in the thermal and dense medium is proposed and used to study the laptonic decay of J/ψ.The laptonic decay property of J/ψin the hot and dense matter depends on the form of the binding potential.The decay width in the potential case is much sensitive to the temperature than that in the Karsch’s potential case,especially in the lower temperature region.In both cases,the decay widths decreased with the increasing temperature and density.The resultant critical temperature of 200 MeV is consistent with the lattice quantum chromodynamics finding.
基金Project supported by the National Science Foundation of China.
文摘The N-N interaction t«studied tn the framework of non-relativistic quark model using the resonating group method(RGM).The △△ channel is taken into account in addition to the NN channel.The calculated S-wave phase shifts show that the channel coupling effect is increased if the quadratic or the linear confinement is replaced by the flat-bottom-linear confinement.This result is quite different from that in the case of the quadratic confinement or the linear confinement,in which this channel coupling effect is negligible.
文摘Nucleon-nucleon interaction is studied in the non-relativistic quark model with a flat bottom linear confinement potential.The results are consistent with the calculated ones from the lattice quantum chromodynamics.The quark-quark interaction also consists of those caused by the one gluon exchange and the one pion exchange.The phenomenological sigma meson exchange between two nucleons is also included to fit the S-wave N-N scattering data.The calculated NN channel S-wave phase shifts show that the flat bottom linear confinement potential can provide part of the medium range attraction.
基金Supported by the National Natural Science Foundation of China under Grant Nos 90103020, 10475089, 10435080, and 10575028, the Knowledge Innovation Project of Chinese Academy of Sciences （KJCX2-SW-N02）, the Major State Basic Research Development Programme of China under Grant No G20000774, and the Natural Science Foundation of Hebei Province under Grant No 103143.
文摘By taking advantage of the model-independent nuclear parton distributions, the structure functions xF3（x, Q^2） are calculated, in comparison with the experimental data from CCFR neutrino-nuclei charge current deep inelastic scattering. It is shown that shadowing and anti-shadowing effects occur in valence quark distributions for small and medium x regions, respectively. It is suggested that the neutrino experimental data should be employed in the future for pinning down the nuclear patton distributions.
