We report here the mass spectrum and magnetic moments of ccq（q ∈ u,d,s） systems in the potential model framework by assuming the inter-quark potential as the colour coulomb plus power form with power index ν varyi...We report here the mass spectrum and magnetic moments of ccq（q ∈ u,d,s） systems in the potential model framework by assuming the inter-quark potential as the colour coulomb plus power form with power index ν varying between 0.1 to 2.0.Here the two charm quarks are considered for the diquark states.The conventional one gluon exchange interaction has been employed to get the hyperfine and the fine structure between different states.We have predicted many low-lying states whose experimental verification can exclusively support the quark-diquark structure of the baryons.展开更多
An upper limit of the average ratio dark matter/ordinary matter in galaxies is estimated to be 8.4, in agreement with the observed ratio 5.4. Upper limit of the average ratio dark energy/ordinary matter for slowly mov...An upper limit of the average ratio dark matter/ordinary matter in galaxies is estimated to be 8.4, in agreement with the observed ratio 5.4. Upper limit of the average ratio dark energy/ordinary matter for slowly moving protons in the outer parts of the universe is estimated to be 8.4, much less than the observed ratio 13.6. The discrepancy is tentatively attributed to that the bulk of the protons in these outer parts of the universe moves fastly and their contribution to dark energy has not been estimated. The positive and negative relative energies between the diquark and quark in the proton play the roles of dark energy and dark matter, respectively.展开更多
We studied the electromagnetic form factors （EMFFs） of Ac and the contributions of the quark and diquark currents to the EMFFs of Ac in the space-like region in the Bethe-Salpeter equation approach with instantaneou...We studied the electromagnetic form factors （EMFFs） of Ac and the contributions of the quark and diquark currents to the EMFFs of Ac in the space-like region in the Bethe-Salpeter equation approach with instantaneous approximation. In this picture, baryon Ac can be regarded as a two-body c（ud） system. We found that for different values of parameters the contribution of quark and diquark currents to the EMFFs of Ac is very different, while their total contribution to the EMFFs of Ac is similar. The EMFFs of ∧c are similar to those of other baryons （proton,≡ , and ∑＋） with a peak at ω= 1, where ω=v＇.v is the velocity transfer between the initial state （with velocity v） and the final state （with velocity vr） of Ac.展开更多
The relations among four-quark states, diquarks and QCD sum rules are discussed. The situation of the existing, but incomplete studies of four-quark states with QCD sum rules is analyzed. Masses of some diquark cluste...The relations among four-quark states, diquarks and QCD sum rules are discussed. The situation of the existing, but incomplete studies of four-quark states with QCD sum rules is analyzed. Masses of some diquark clusters were attempted to be determined by QCD sum rules, and masses of some light tetraquark states were obtained in terms of the diquarks.展开更多
基金the financial support from University Grant Commission,Government of India,under a Major Research Project F.32-31/2006(SR)
文摘We report here the mass spectrum and magnetic moments of ccq（q ∈ u,d,s） systems in the potential model framework by assuming the inter-quark potential as the colour coulomb plus power form with power index ν varying between 0.1 to 2.0.Here the two charm quarks are considered for the diquark states.The conventional one gluon exchange interaction has been employed to get the hyperfine and the fine structure between different states.We have predicted many low-lying states whose experimental verification can exclusively support the quark-diquark structure of the baryons.
文摘An upper limit of the average ratio dark matter/ordinary matter in galaxies is estimated to be 8.4, in agreement with the observed ratio 5.4. Upper limit of the average ratio dark energy/ordinary matter for slowly moving protons in the outer parts of the universe is estimated to be 8.4, much less than the observed ratio 13.6. The discrepancy is tentatively attributed to that the bulk of the protons in these outer parts of the universe moves fastly and their contribution to dark energy has not been estimated. The positive and negative relative energies between the diquark and quark in the proton play the roles of dark energy and dark matter, respectively.
基金Supported by the Fundamental Research Funds for the Central Universities of China(31020170QD052)the Natural Science Basic Research Plan in Shaanxi Province of China(2018JQ1002)the National Natural Science Foundation of China(11775024,11575023)
文摘We studied the electromagnetic form factors （EMFFs） of Ac and the contributions of the quark and diquark currents to the EMFFs of Ac in the space-like region in the Bethe-Salpeter equation approach with instantaneous approximation. In this picture, baryon Ac can be regarded as a two-body c（ud） system. We found that for different values of parameters the contribution of quark and diquark currents to the EMFFs of Ac is very different, while their total contribution to the EMFFs of Ac is similar. The EMFFs of ∧c are similar to those of other baryons （proton,≡ , and ∑＋） with a peak at ω= 1, where ω=v＇.v is the velocity transfer between the initial state （with velocity v） and the final state （with velocity vr） of Ac.
基金Supported by National Natural Science Foundation of China (10775093)
文摘The relations among four-quark states, diquarks and QCD sum rules are discussed. The situation of the existing, but incomplete studies of four-quark states with QCD sum rules is analyzed. Masses of some diquark clusters were attempted to be determined by QCD sum rules, and masses of some light tetraquark states were obtained in terms of the diquarks.
