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arXiv 0907.3303hep-ph
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HERA中瞬发光子光生的非共线部分子动力学研究

Study of non-collinear parton dynamics in the prompt photon photoproduction at HERA

A. V. Lipatov, N. P. Zotov

摘要:

我们在kt因子化QCD方法的框架下研究了HERA的瞬时光子光生。我们的考虑是基于基本的部分子过程的离壳矩阵元素。用Kimber-Martin-Ryskin(KMR)公式计算了质子和光子中未积分的部分子密度。此外,我们使用CCFM演化的未积分胶子以及质子中的价和海夸克分布。进行了保守误差分析。包括和相关的强子喷流产生率进行了研究。理论结果与最近的实验数据进行了比较H1和ZEUS合作。我们还研究了光子喷注系统的特定运动学性质,它对入射部分子的横向动量非常敏感。利用KMR方案,估计了部分子演化早期阶段中出现的夸克的贡献,发现约为15 - 20。

英文摘要:

We investigate the prompt photon photoproduction at HERA within the framework of kt-factorization QCD approach. Our consideration is based on the off-shell matrix elements for the underlying partonic subprocesses. The unintegrated parton densities in a proton and in a photon are determined using the Kimber-Martin-Ryskin (KMR) prescription. Additionally, we use the CCFM-evolved unintegrated gluon as well as valence and sea quark distributions in a proton. A conservative error analisys is performed. Both inclusive and associated with the hadronic jet production rates are investigated. The theoretical results are compared with the recent experimental data taken by the H1 and ZEUS collaborations. We study also the specific kinematical properties of the photon-jet system which are strongly sensitive to the transverse momentum of incoming partons. Using the KMR scheme, the contribution from the quarks emerging from the earlier steps of the parton evolution is estimated and found to be of 15 - 20 approximately.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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