η_C的光生衍射产生

η_C diffractive photon production

利用轻子硬衍射过程的因子化方法和重夸克偶素的色八重态产生机制,研究了的光生衍射过程。结果说明此过程产生的截面可以在DESYHERA上探测。在NRQCD理论框架下,的产生是一个纯色八重态过程。在大区域主要的贡献来自108态,而它的长程矩阵元更可靠,进而计算得到的的产生结果较可靠。对此过程的实验测量会进一步检验重夸克偶素的色八重态产生机制与Pomeron中的胶子分布函数。

By using lepton induced diffractive process factorization method and in the frame of heavy quarkonuim color octet production mechanism, the ηc diffractive photon production cross sections are calculated and discussed. The results show that the diffractive cross sections of ηc photon production can be detected by DESY HERA. The experiment data indicates that the matrix element of 1S0^（8） state can be extracted independently.