π介子的胶子分布函数对J/Ψ衍射产生的影响

Influence of gluon distribution on Pion to J/(?) diffractive production

利用双胶子交换模型并结合重夸克偶素的色八重态产生机制,计算了π与p碰撞过程中J/ 的衍射产生总截面随质心系能量的变化情况。结果发现:随着质心系能量的增加J/ 衍射产生的总截面逐渐增大:不同的π介子中的胶子分布函数给出的总截面随着质心系能量的增加相差逐渐加大,在质心系能量为300 GeV时,总截面的差距为11％。对总截面的贡献主要来自于π介子中x1在0.01到0.50范围内的胶子,由于质子中胶子的分部函数已经探测得比较准确,所以高能实验对这一过程的研究,可以进一步了解π介子中的胶子分布函数并有效检验双胶子交换模型。

Based on double gluon exchange model and heavy quarkonuim color octet production mechanism, the diffractive cross sections of J/(?) in Pion and p collision process are calculated. The results show that the diffractive total cross section of J/(?) increases when the center mass energy increases. And the discrepancy of the total cross section calculated with different gloun distribute functions also increases when the center mass energy increases. The main contribution to the total cross section comes from the region 0.01 to 0.5 of the gluon fraction in Pion. Comparing the experiment results with the theoretical data, the gluon distribution function of Pion and double gluon exchange model could be examined.