ep碰撞过程中J/ψ与γ协同产生的衍射截面  

Diffractive scattering cross section of J/ψ and γ associated production in HERA ep collision

作　　者：张晓宏[1] 阎占元[1] 

机构地区：[1]华北电力大学物理教学部,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2002年第3期93-95,共3页Journal of North China Electric Power University：Natural Science Edition

基　　金：河北省自然科学基金(100144);华北电力大学青年科研基金(060214)资助项目.

摘　　要：利用三套Ｐｏｍｅｒｏｎ的结构函数和重夸克偶素的色八重态产生机制,计算了ｅｐ碰撞中,解离光子与质子的衍射过程中Ｊ/ψ与γ协产生的截面。结果发现:由不同 Ｐｏｍｅｒｏｎ的结构函数引起的微分截面的差别可达到１．８倍;总截面的差别为１．７倍,在质心系能量为１００ＧｅＶ时,总截面可达到０．００３ｎｂ。所以,通过实验上对这一过程的精确测量结果,可以进一步了解Ｐｏｍｅｒｏｎ的结构和衍射过程的因子化方法。Using three sets of Pomeron structure functions, the cross sections of J/ψ and γ associate production via resolved photon and proton diffractive scatting in ep collision are investigated. It is found that the cross sections calculated with vary gluon distribution functions of Pomeron are different, the discrepancy is about 1.8 times for differential cross section and 1.7 times for total cross section. The experimental studies of the process could give valuable insight in the diffractive production mechanism and test the color-octet mechanism for heavy quarkonia production in a new environment.

关 键 词：ep碰撞过程 J/Ψ γ 衍射截面 衍射过程 色八重态 光子 质子 强子碰撞 

分 类 号：O571[理学—粒子物理与原子核物理]