CAJ | 학술논문

核遮蔽和能量损失效应是p-A碰撞中两种重要的初态核效应.本文利用从轻子-原子核深度非弹性散射实验数据中抽取的束缚核子的部分子分布函数,在色弦模型中研究了Drell-Yan双轻子对产生过程中的能量损失效应.通过对FNAL E772和E866实验数据的χ2分析,得到夸克在冷核中的能量损失率为-dE/dz=2.06GeV/fm.这和该模型理论预言的结果(-dE/dz～2GeV/fm)一致.通过将理论计算结果与实验数据进行比较,发现考虑到能量损失后能很好的解释实验现象.
핵차폐화능량손실효응시p-A팽당중량충중요적초태핵효응.본문이용종경자-원자핵심도비탄성산사실험수거중추취적속박핵자적부분자분포함수,재색현모형중연구료Drell-Yan쌍경자대산생과정중적능량손실효응.통과대FNAL E772화E866실험수거적χ2분석,득도과극재랭핵중적능량손실솔위-dE/dz=2.06GeV/fm.저화해모형이론예언적결과(-dE/dz～2GeV/fm)일치.통과장이론계산결과여실험수거진행비교,발현고필도능량손실후능흔호적해석실험현상.
Nuclear shadowing and energy loss effects are two important initial-state nuclear effects in hadronnucleus collisions. In this paper, by means of the nuclear parton distributions extracted only from lepton deep-inelastic scattering experimental data, the energy loss effect in Drell-Yan dimuon production process is studied in the color string model. By a χ2 analysis of the experimental data given by FNAL E772 and E866,we found the rate of quark energy loss per unit path length: -dE/dz = 2.06GeV/fm, which is almost the same as the result expected by the model -dE/dz ≈ 2GeV/fm. The calculated results are compared with the E772 and E866 data. It is shown that the theoretical results considered the energy loss effect are in good agreement with the experimental data.