Two-photon ezchange to proton electromagnetic properties in time-like region

摘要：

The contributions of two-photon exchange in the process e~++e~-→p +(p) including N and △ intermediate states are estimated in a simple hadronic model. The corrections to the unpolarized cross section as well as to the polarized observables P_x and P_z are evaluated. The results show the corrections to unpolarized cross section are small and the angle dependence becomes weak at small s after considering the N and △(1232) contributions simultaneously, while the correction to P_z is enhanced.

关键词： two-photon ezchange nucleon delta form factor

作者: CHEN Dian-Yong ZHOU Hai-Qing DONG Yu-Bing

作者单位: Institute of High Energy Physics,CAS,Beijing 100049,China;Theoretical Physics Center for Science Fac Department of Physics,Southeast University,Nanjing 211189,China

会议类型: 国际会议

会议名称: The 12th International Workshop on the Physics of Ezcited Nucleon NSTAR2009(2009激发态核子物理研讨会)

会议地点: 北京

会议语种:英文

页码: 1336-1339

在线出版日期: 2009-04-19（万方平台首次上网日期，不代表论文的发表时间）