CAJ | 학술논문

利用Glauber模型以及DGLAP方程下的核内核子的部分子分布函数,在次领头阶QCD下计算了Drell-Yan过程中的能量损失效应,计算表明QCD修正并不能改善理论结果与试验结果的符合,尤其是p-W与p-Be以x1为变量的微分截面比.原因是所用的核内核子部分子的分布函数是以领头阶近似为基础并通过演化方程得到的.于是利用在次领头阶微扰QCD下得到的核遮蔽效应核内核子的部分子分布函数重新计算了次领头阶QCD修正对Drell-Yan过程能量损失的贡献.计算结果表明康普顿散射过程与湮没过程中应该有更多的能量损失.
이용Glauber모형이급DGLAP방정하적핵내핵자적부분자분포함수,재차령두계QCD하계산료Drell-Yan과정중적능량손실효응,계산표명QCD수정병불능개선이론결과여시험결과적부합,우기시p-W여p-Be이x1위변량적미분절면비.원인시소용적핵내핵자부분자적분포함수시이령두계근사위기출병통과연화방정득도적.우시이용재차령두계미우QCD하득도적핵차폐효응핵내핵자적부분자분포함수중신계산료차령두계QCD수정대Drell-Yan과정능량손실적공헌.계산결과표명강보돈산사과정여인몰과정중응해유경다적능량손실.
In this paper, by means of the nuclear parton distribution obtained from the DGLAP equation,taking into account the energy loss of the beam proton through the nucleus, we analyze the QCD corrections to the measured Drell-Yan production cross sections for an 800GeV proton beam incident on Be, Fe and W nuclear targets in the Glauber model. For the nuclear parton distribution being extracted from the leading order, the results show that the QCD corrections can't improve the theoretical results fitting to the experimental data,especially in the cross section ratio of p-W to p-Be verse x1. Then we calculate the Drell-Yan cross sections using the shadowing effect, which is extracted from the next-to-leading order by Frankfurt et al., and find that direct photon production should be sensitive to energy loss in Compton scattering and annihilation process.