排序方式: 共有42条查询结果,搜索用时 15 毫秒
11.
12.
首先强调了在高能强作用软(高强软)过程,特别是在强子散射总截面中,单由Pomeron(IP)交换就渐进地饱和了幺正性条件这件事的重要性.结合对Landshoff和Nachtmann的IP场论模型适当修改,提出了最大非微扰强作用反应假说.与此相关,认为IP由这种反应中得出的一对共轭色八重态胶团组成.通过对修改后的q-q弹性振幅虚部图形的物理内涵的考察,一方面预言了高强软过程中会产生组分胶子,胶球态是由两个对撞的组分胶子熔合所形成.另一方面,通过这里的色胶团单圈图与Gell-mann-Zweig的介子散射时夸克图的对应,论证了IP与胶球态之间存在着Regge极点型的二元性关系. 相似文献
13.
14.
The longitudinally polarized Drell-Yan process is one of the most powerful tools to probe the structure of hadrons.By means of the recent formalism of the polarized proton-deuteron (pd) Drell-Yan, we calculate the ratio of the proton-deuteron Drell-Yan cross section to the proton-proton (pp) one △σpd/2△σpp in the polarized case. The theoretical results can be compared with future experimental data to confirm the nuclear effect due to the 6-quark cluster in deuteron. 相似文献
15.
16.
17.
The energy loss effect in nuclear matter, which is another nuclear effect apart from the nuclear effects on the patton distribution as in the deep inelastic scattering process, can be measured best by the nuclear dependence of the high energy nuclear Drell-Yan process. By means of the quark energy loss parametrization given in literature and the nuclear patton distribution extracted only with lepton-nucleus deep inelastic scattering experimental data, measured Drell-Yan production cross sections are analysed for 800-GeV protons incident on a variety of nuclear targets from FNAL E866. The average energy loss of quarks are given by fitting the Fe/Be and W/Be Drell-Yan cross section ratios versus the incident patton momentum fraction. 相似文献
18.
19.
By means of two typical sets of nuclear parton distribution functions, meanwhile taking account of the energy loss of the beam proton and the nuclear absorption of the charmonium states traversing the nuclear matter in the uniform framework of the Glauber model, a leading order phenomenological analysis is given in the color evaporation model of the E866 experimental data on J/ψ production differential cross section ratios RFe/Be(xF). It is shown that the energy loss effect of beam proton on RFe/Be(xF) is more important than the nuclear effects on parton distribution functions in the high Feynman variable xF region. It is found that the J/ψ-nucleon inelastic cross section depends on the Feynman variable xF and increases linearly with xF in the region xF>0.2. 相似文献
20.