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Space- and time-like kaon electromagnetic form factors in perturbative QCD

Chinese Physics C 2012年第10期36卷 941-946页

作者：金丹杨亚东 Institute of Particle Physics Huazhong Normal University Key Laboratory of Quark & Lepton Physics Ministry of Education

We present a phenomenological analysis of the space- and time-like charged kaon electromagnetic form factors in factorized perturbative QCD （pQCD） by employing an analytic model for αs （Q2 ） and an infrared （IR） finite gluon propagator. In the space-like region, due to the lack of available experimental data above Q2 ～ 0.2 GeV2 , we only give our results for intermediate energies and make no comparison. In the time-like region, our results agree reasonably well with the available experimental data at moderate energies, including the CLEO data and the J/ψ result.

关键词： electromagnetic form factor perturbative QCD analytical running coupling twist-3 corrections IR finite gluon propagator

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A method for measuring D＊ electromagnetic form factors in e＋e- annihilation

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Chinese Physics C 2017年第9期41卷 1-7页

作者：郭晗张子平 University of Science and Technology of China Hefei 230026 China

We describe a method for measuring the electromagnetic form factors of the D＊ meson at time-like momentum transfer in e＋e- annihilation. This is to study the joint angular distribution of the e＋e- →γ＊→D＊＋D＊-, D＊＋ →D0π＋, and D＊-→＊D0π- processes. The magnitudes and relative phases of the charge, magnetic and quadrupole form factors can be determined. The method can also be applied to other vector particles.

关键词： electromagnetic form factor D* meson e+e- annihilation perturbative QCD

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Nucleon form factors and N-△ Transitions in a Hypercentral Constituent Quark Model with Meson Cloud

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Communications in Theoretical Physics 2007年第3期47卷 539-546页

作者： CHEN Dina-Yong DONG Yu-Bing Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China Gradtuate School of the Chinese Academy of Sciences Beijing 100049 China

We study the nucleon form factors and the nucleon-△（1232） transitions in a framework of hypercentral constituent quark model. The pion meson cloud effect is taken into account explicitly. Our results show that the pion cloud contributes substantially to the nucleon form factors as well as to the helicity amplitudes of △（1232）, and it gives an improved agreement compared to the experimental.

关键词： electromagnetic form factor nucleon and △(1232) hypercentral constituent quark model meson cloud

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Nucleon form factors and N-A Transitions in a Hypercentral Constituent Quark Model with Meson Cloud

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Communications in Theoretical Physics 2007年第3期 539-546页

作者： CHEN Dina-Yong~(1,2) DONG Yu-Bing~(1,+)1 Institute of High Energy Physics,the Chinese Academy of Sciences,Beijing 100049,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China Institute of High Energy Physics，the Chinese Academy of Sciences，Beijing 100049，China Graduate School of the Chinese Academy of Sciences，Beijing 100049，China Institute of High Energy Physics，the Chinese Academy of Sciences，Beijing 100049，China

We study the nucleon form factors and the nucleon-△(1232)transitions in a framework of hypercentralconstituent quark *** pion meson cloud effect is taken into account *** results show that the pioncloud contributes substantially to the nucleon form factors as well as to the helicity amplitudes of △(1232),and it givesan improved agreement compared to the experimental measurement.

关键词： electromagnetic form factor nucleon and △(1232) hypercentral constituent quark model meson cloud

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