【摘要】 在微扰QCDαs 级近似下 ,采用双重Q2 重标度模型 ,计算了 p A碰撞Drell Yan截面与 p N碰撞Drell Yan截面之比 ,即核效应函数RQCD(xA,Q2 ) .计算结果与没有QCD修正的R(xA,Q2 )值比较 ,在 0 0 3 xA 0 3之间都有不同程度的压低 ,与实验符合的情况有所改善 .说明对核Drell Yan过程核效应的研究 ,QCD修正是有一定意义的 ,并且在计入这种修正后 ,双重Q2 重标度模型仍然是有效的 .更多还原

【Abstract】 Taking into account perturbative QCD α s order approximation, using double Q 2 rescaling model, the cross section ratios of Drell Yan process in p A collision to p D collision are calculated. Comparing these results with the ratios without QCD corrections, it shows the neclear effect functions R Q?C?D ( x A, Q 2) are suppressed by different extent for different nucleus, in different ranges of x A(T) . Comparing with the E772 experiment data, R Q?C?D ( x A, Q 2) are better fitted than R ( x A, Q 2). It is shown that the QCD corrections are interesting in studing the nuclear effect of D Y process. After taking into account of α s order corrections, double Q 2 rescaling model is still effective.更多还原