Recent HERMES Results on DVCS from Proton and Nuclear Targets  

作　　者：YE Hong-xue,MAO Ya-jun (School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China) 

出　　处：《原子核物理评论》2009年第S1期124-128,共5页Nuclear Physics Review

基　　金：National Natural Science Foundation of China(10375002,10675004)

摘　　要：Spin structure is one of the fundamental subjects in the study of nucleon structure. Recently it is found that Generalized Parton Distributions(GPDs) are related to the total angular momentum carried by partons,which offers a possible solution to the spin puzzle in the first time. We get access to certain GPDs by looking at the azimuthal angle asymmetries attributed to the interference between Deeply Virtual Compton Scattering(DVCS) and Bethe-Heilter processes in HERMES experiment. By measuring the asymmetry with respect to transverse target polarization from proton target,a model-dependent constraint on Ju vs Jd is obtained. Another worldwide unique channel is nuclear DVCS. The preliminary results on asymmetries with respect to beam spin and beam charge are reported.Spin structure is one of the fundamental subjects in the study of nucleon structure. Recently it is found that Generalized Parton Distributions(GPDs) are related to the total angular momentum carried by partons,which offers a possible solution to the spin puzzle in the first time. We get access to certain GPDs by looking at the azimuthal angle asymmetries attributed to the interference between Deeply Virtual Compton Scattering(DVCS) and Bethe-Heilter processes in HERMES experiment. By measuring the asymmetry with respect to transverse target polarization from proton target,a model-dependent constraint on Ju vs Jd is obtained. Another worldwide unique channel is nuclear DVCS. The preliminary results on asymmetries with respect to beam spin and beam charge are reported.

关 键 词：GPDS DVCS TTSA NUCLEAR DVCS 

分 类 号：O572.24[理学—粒子物理与原子核物理]