高能p+p(p)碰撞中J/ψ和γ的硬衍射产生

讨论从ISR到SSC能区p+p(p)→p+J/ψ(Υ)+X过程.假定Pomeron(p)的结构以胶子为主且在小x处有的行为后,在QCD最低阶计算了两个主要子过程的硬衍射截面和作为背景项的Drell-Yan模式的相应截面.与背景项在高能时随Ins增加不同,硬衍射项基本上随(InS)²增加,因而在TeV能区以上时后者将大大超过前者.这种性质对其它硬衍射过程具有普适性.因此如果关于P的上述假定正确,在准确地测定P的结构后,选择适当的硬衍射过程,可能在超高能时提供探测物理粒子的新实验方法.

Hard Diffractive Production of Heavy Flavors in High Energy p p(p)Collisions

The processes for energies ranging from ISR to SSC are discussed. Assuming that Pomeron(P)have parton distributions and dominated by gluons with behavior as when x.is small,we calculate carefully the cross sections for the above hard diffractive processes and of"background"DrellYan Processes by tab lug two main sub-diagrams in the lowest order of QCD.In contrast to InS increasing with S for the background cross sections,the hard diffractive ones increase as(InS)2,hance the latter would be greatly beyond the former at TeV energies.We shown that this property is universal for other hard diffractive processes.So,if our assumptions about P are right,they would provide anew method for detecting physical particles at superhigh energies.