Contribution of Coherent and Incoherent π-Photoproduction Channels to the Spin Asymmetry and the GDH Sum Rule for the Deuteron

作     者：Darwish Eed M. 

作者机构：Physics DepartmentFaculty of ScienceTaibah University Physics DepartmentFaculty of ScienceSohag University 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2015年第32卷第12期

页      面：35-39页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

主　　题：GDH Contribution of Coherent and Incoherent 

摘      要：An explicit evaluation of the deuteron spin asymmetry and the associated Gerasimov-Drell Hearn （GDH） integral for coherent and incoherent π-photoproduction channels with inclusion of rescattering effects is presented. The helicity-dependent total inclusive photoabsorption cross section on the deuteron and the helicity-dependent semiexclusive channels γd→π± NN and γd→π0X （X = pn or d） are explicitly evaluated up to 1.5 GeV. Our model calculations indicate that convergence of the GDH integral is reached for π-production, while it is not completely reached for π-production. For the sum of 7d → πNN and γd→ π0d contributions to the finite GDH integral by explicit integration up to 1.5 GeV, a value of 249.73μb is obtained. The extracted results are compared with available experimental data from MAMI and ELSA. We find that our predictions fairly well reproduce the data in the μ±NN case, while fail to predict the measured shape of the μ0X channel.