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Radial excitation states of η and η′ in the chiral quark model

Chinese Physics C 2012年第8期36卷 681-690页

作者：陈绍娜平加伦 School of Physical Science and Technology Nanjing Normal University School of Physics and Microelectronics Shandong University

A chiral quark model is applied to calculate the spectra of pseudoscalar mesons η and η . By analyzing the obtained spectra, we find that the mesons η （2 1 S 0 ）, η（4 1 S 0 ）, η （3 1 S 0 ） and η （4 1 S 0 ） are the possible candidates of η（1760）, X（1835）, X（2120） and X（2370）. The strong decay widths of these pseudoscalars to all the possible two-body decay channels are calculated within the framework of the 3 P 0 model. Although the total width of η （21S0 ） is compatible with the BES Collaboration＇s experimental value for η（1760）, the partial decay width to ωω is too small, which is not consistent with the BES result. If X（1835） is interpreted as η（4 1 S 0 ）, the total decay width is compatible with the experimental data, and the main decay modes will be πa 0 （980） and πa 0 （1450）, which needs to be checked experimentally. The assignment of X（2120） and X（2370） to η （31S0 ） and η （41S0 ） is disfavored in the present calculation because of the incompatibility of the decay widths.

关键词： X(1835) X(2120) X(2370) η(1760) chiral quark model pseudoscalar meson

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Glueball spectrum from Nf=2 lattice QCD study on anisotropic lattices

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Chinese Physics C 2018年第9期42卷 23-36页

作者： Wei Sun Long-Cheng Gui Ying Chen Ming Gong Chnan Liu Yu-Bin Liu Zhaofeng Liu Jian-Ping Ma Jian-Bo Zhang Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China School of Physics University of Chinese Academy of Sciences Beijing 100049 China Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha 410081 China School of Physics and Center for High Energy Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China School of Physics Nankai University Tianjin 300071 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China Department of Physics Zhejiang University Hangzhou Zhejiang 310027 China

The lowest-lying glueballs are investigated in lattice QCD using Nf = 2 clover Wilson fermions on anisotropic lattices. We simulate at two different and relatively heavy quark masses, corresponding to physical pion masses of mπ～938 MeV and 650 MeV. The quark mass dependence of the glueball masses has not been investigated in the present study. Only the gluonic operators built from Wilson loops are utilized in calculating the corresponding correlation functions. In the tensor channel, we obtain the ground state mass to be 2.363（39） GeV and 2.384（67）GeV at mπ～938 MeV and 650 MeV, respectively. In the pseudoscalar channel, when using the gluonic operator whose continuum limit has the form of ∈_ijkTrB_iD_jB_k, we obtain the ground state mass to be 2.573（55） GeV and 2.585（65） GeV at the two pion masses. These results are compatible with the corresponding results in the quenched approximation. In contrast, if we use the topological charge density as field operators for the pseudoscalar, the masses of the lowest state are much lighter（around 1 GeV） and compatible with the expected masses of the flavor singlet qq meson. This indicates that the operator ∈ijk TrBiDjBk and the topological charge density couple rather differently to the glueball states and qq mesons. The observation of the light flavor singlet pseudoscalar meson can be viewed as the manifestation of effects of dynamical quarks. In the scalar channel, the ground state masses extracted from the correlation functions of gluonic operators are determined to be around 1.4-1.5 GeV, which is close to the ground state masses from the correlation functions of the quark bilinear operators. In all cases, the mixing between glueballs and conventional mesons remains to be further clarified in the future.

关键词： glueball pseudoscalar meson topological charge density

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Measurements of the γγ＊ → π^0 and γγ＊ → ηc transition form factors at BABAR

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Chinese Physics C 2010年第6期34卷 816-821页

作者： V.P.Druzhinin Budker Institute of Nuclear Physics

We present measurements of the γγ＊ → π^0 transition form factor for the momentum transfer range Q^2=4-40 GeV^2 and the γγ＊ → ηc transition form factor for the range Q^2=2-50 GeV^2. The current status of measurements of the meson-photon transition form factors for the η and η＇ mesons is discussed. The results of the measurement of the ηc mass, total and two-photon widths are also presented.

关键词： two-photon interaction pseudoscalar meson transition form factor pi0 eta eta(958) etac

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