The nonleptonic two body Bu;d;s;c decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on kTfactorization.The decay modes with a tensor meson emitted,are prohibited ...The nonleptonic two body Bu;d;s;c decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on kTfactorization.The decay modes with a tensor meson emitted,are prohibited in naive factorization,since the emission diagram with a tensor meson produced from vacuum is vanished.While contributions from the so-called hard scattering emission diagrams and annihilation type diagrams are important and calculable in the perturbative QCD approach.The branching ratios of most decays are in the range of 10 4–10 8,which are bigger by 1 or 2 orders of magnitude than the predictions given by the naive factorization,but consistent with the predictions from the QCD factorization and the recent experimental measurements.We also give the predictions for the direct CP asymmetries,some of which are large enough for the future experiments to measure.We also find that,even with a small mixing angle,the mixing between f2and f02can bring remarkable changes to both branching ratios and the direct CP asymmetries for some decays involving fe0T2mesons.For decays with a vector meson and a tensor meson in final states,we predict a large percentage of transverse polarization contributions due to the contributions of the orbital angular momentum of the tensor mesons.展开更多
The symmetric spin-orbit interactions of one-gluon-exchange and confinement are included in the nucleon-nucleon phase shift calculation in the framework of quark delocalization eolour screening model. The spin-orbit i...The symmetric spin-orbit interactions of one-gluon-exchange and confinement are included in the nucleon-nucleon phase shift calculation in the framework of quark delocalization eolour screening model. The spin-orbit interaction has little influence on D wave phase shift. For the triplet P waves, aPT is in good agreement with the experimental data and 3pLs is attractive but not strong enough, whereas 3 Pc is too strongly repulsive. Our results indicate that the symmetric spin-orbit interaction of one-gluon-exchange and confinement potential cannot give a good description of the triplet P wave phase shifts. More sophisticated considerations, the delocalization depending on the relative orientation between two cluster, might be needed to improve the description of P-wave NN interaction.展开更多
Based on the generalized QCD vector meson dominance model, we study the electroproduction of a vector meson off a proton in the QCD inspired eikonalized model. Numerical calculations for the total cross section σ tot...Based on the generalized QCD vector meson dominance model, we study the electroproduction of a vector meson off a proton in the QCD inspired eikonalized model. Numerical calculations for the total cross section σ tot and differential cross section dσ/dt are performed for ρ, ω and φ meson electroproduction in this paper. Since gluons interact among themselves （self-interaction）, two gluons can form a glueball with quantum numbers I G , J P C = 0 ＋ , 2 ＋＋ , decay width Γ t ≈ 100 MeV, and mass of m G =2.23 GeV. The three gluons can form a three-gluon colorless bound state with charge conjugation quantum number C = 1, called the Odderon. The mediators of interactions between projectiles （the quark and antiquark pair fluctuated from the virtual photon） and the proton target （a three-quark system） are the tensor glueball and the Odderon. Our calculated results in the tensor glueball and Odderon exchange model fit to the existing data successfully, which evidently shows that our present QCD mechanism is a good description of meson electroproduction off a proton. It should be emphasized that our mechanism is different from the theoretical framework of Block et al. We also believe that the present study and its success are important for the investigation of other vector meson electro- and photoproduction at high energies, as well as for searching for new particles such as tensor glueballs and Odderons, which have been predicted by QCD and the color glass condensate model （CGC）. Therefore, in return, it can test the validity of QCD and the CGC model.展开更多
基金supported in part by the Foundation of Yantai University (WL07052)the National Natural Science Foundation of China (11375208,11228512,11235005 and 11175151)
文摘The nonleptonic two body Bu;d;s;c decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on kTfactorization.The decay modes with a tensor meson emitted,are prohibited in naive factorization,since the emission diagram with a tensor meson produced from vacuum is vanished.While contributions from the so-called hard scattering emission diagrams and annihilation type diagrams are important and calculable in the perturbative QCD approach.The branching ratios of most decays are in the range of 10 4–10 8,which are bigger by 1 or 2 orders of magnitude than the predictions given by the naive factorization,but consistent with the predictions from the QCD factorization and the recent experimental measurements.We also give the predictions for the direct CP asymmetries,some of which are large enough for the future experiments to measure.We also find that,even with a small mixing angle,the mixing between f2and f02can bring remarkable changes to both branching ratios and the direct CP asymmetries for some decays involving fe0T2mesons.For decays with a vector meson and a tensor meson in final states,we predict a large percentage of transverse polarization contributions due to the contributions of the orbital angular momentum of the tensor mesons.
文摘利用Regge唯象学,首先计算了基态张量介子多重态中奇异偶素ss、粲-底介子B*c2的质量,然后计算了张量介子的Regge轨迹和斜率,最后给出了轨道激发态13F4,13H6和13K8介子九重态的质量.实验结果表明,可将fJ(2 220)和X(2 710)分别作为f'4(13F4)和f'6(13H6)的候选态进行探究,建议实验上分别在6 785 Me V,2 595Me V能量附近寻找和研究尚未观测到的介子B*c2(13P2)和K*6(13H6).分别在2 095 Me V,1 969 Me V,2 498 Me V能量附近进一步研究K*4(2 045),f4(2 050),a6(2 450)的性质.结果对在实验上寻找尚未发现的介子和相关介子的自旋-宇称安排具有一定的理论指导意义.将来可以在LHCb、BES-III等实验装置中验证.
基金Supported by the National Science Foundation of China under Grant Nos 90503011, 10775072, 10375030 and 10505006.
文摘The symmetric spin-orbit interactions of one-gluon-exchange and confinement are included in the nucleon-nucleon phase shift calculation in the framework of quark delocalization eolour screening model. The spin-orbit interaction has little influence on D wave phase shift. For the triplet P waves, aPT is in good agreement with the experimental data and 3pLs is attractive but not strong enough, whereas 3 Pc is too strongly repulsive. Our results indicate that the symmetric spin-orbit interaction of one-gluon-exchange and confinement potential cannot give a good description of the triplet P wave phase shifts. More sophisticated considerations, the delocalization depending on the relative orientation between two cluster, might be needed to improve the description of P-wave NN interaction.
基金Supported by Guangxi Science Foundation for Young Researchers(0991009)Department of Guangxi Education(200807MS112)+1 种基金Department of Guangxi Education for the Excellent scholars of Higher Education(2011-54)Doctoral Science Foundation of Guangxi University of Technology(11Z16)
文摘Based on the generalized QCD vector meson dominance model, we study the electroproduction of a vector meson off a proton in the QCD inspired eikonalized model. Numerical calculations for the total cross section σ tot and differential cross section dσ/dt are performed for ρ, ω and φ meson electroproduction in this paper. Since gluons interact among themselves （self-interaction）, two gluons can form a glueball with quantum numbers I G , J P C = 0 ＋ , 2 ＋＋ , decay width Γ t ≈ 100 MeV, and mass of m G =2.23 GeV. The three gluons can form a three-gluon colorless bound state with charge conjugation quantum number C = 1, called the Odderon. The mediators of interactions between projectiles （the quark and antiquark pair fluctuated from the virtual photon） and the proton target （a three-quark system） are the tensor glueball and the Odderon. Our calculated results in the tensor glueball and Odderon exchange model fit to the existing data successfully, which evidently shows that our present QCD mechanism is a good description of meson electroproduction off a proton. It should be emphasized that our mechanism is different from the theoretical framework of Block et al. We also believe that the present study and its success are important for the investigation of other vector meson electro- and photoproduction at high energies, as well as for searching for new particles such as tensor glueballs and Odderons, which have been predicted by QCD and the color glass condensate model （CGC）. Therefore, in return, it can test the validity of QCD and the CGC model.
