【摘 要】
：
在微扰QCDαs 阶 (NLO)近似和核 (A)的部分子分布函数采用双重Q2重标度模型 (DQ2 RM)下 ,讨论了 p N(A)Drell Yan过程中K因子的变化 .结果表明K因子不能近似当作常数 .它随靶
【机 构】
：
山东大学物理系!济南250100,河北师范大学物理系河北050016,河北师范大学物理系!河北050016,河北师范大学物理系!河北050016,北京大学物理系!北京100871
论文部分内容阅读
在微扰QCDαs 阶 (NLO)近似和核 (A)的部分子分布函数采用双重Q2重标度模型 (DQ2 RM)下 ,讨论了 p N(A)Drell Yan过程中K因子的变化 .结果表明K因子不能近似当作常数 .它随靶核子中部分子相关的运动学变量xT(A)显著变化 .在ISR和Sp pS能区 ,当 2× 10 -3 ≤xT(A) <1时 ,K因子随xT(A) 减小而显著减小 ;而xT(A) <2× 10 -3 时随xT(A) 继续减小又显著增加 .K因子对核(A)也有一定依赖性 ,这也是在xT(A) 小时较为明显 .这种认识对于在超高能对撞区利用Drell Yan过程 (或其类似过程 )精确检验某些模型或物理量都是重要的 .
The change of K factor in p N (A) Drell Yan process is discussed under the double QD Scalogram model (DQ2 RM) for the partial sub-distribution function of perturbation QCDαs order (NLO) and kernel (A) The k-factor can not be approximated as a constant, and it varies significantly with the xT (A) kinematics of some molecules in the target nucleus. In the ISR and Sp pS energies, when 2 × 10 -3 ≤ xT (A) <1, K Factor decreased significantly with decreasing xT (A); while xT (A) <2 × 10 -3 continued to decrease and then increased significantly with xT (A) .K factor also had a certain dependence on nuclear (A) It is also evident in xT (A) hours, a realization that is important for the accurate testing of certain models or quantities using the Drell Yan process (or its equivalent) in an EHF zone.
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