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arXiv 1104.0095hep-phhep-ex
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QCD次领先阶无质量粲喷注的双射流光生

Dijet photoproduction of massless charm jets at next-to-leading order of QCD

M. Klasen, G. Kramer

摘要:

在零质量变味数方案下,即在质子和光子中含有活性粲夸克的情况下,计算了QCD次领先级的粲双喷光生截面。将结果与HERA的ZEUS实验的最新测量结果进行比较。对各种分布的预测与数据吻合得很好,特别是对于光子中部分子的大动量分数,其中直接光子过程占主导地位。在低动量分数时,预言对光子中的粲含量相当敏感。实验数据表明,有利于参数化与大量的魅力夸克密度,如由Cornet等人提出的。

英文摘要:

We compute the charm dijet photoproduction cross section at next-to-leading order of QCD in the zero-mass variable flavour number scheme, i.e. with active charm quarks in the proton and photon. The results are compared to recent measurements from the ZEUS experiment at HERA. The predictions for various distributions agree well with the data, in particular for large momentum fractions of the the partons in the photon, where direct photon processes dominate. At low momentum fractions, the predictions are quite sensitive to the charm content in the photon. The experimental data are shown to favour parameterizations with a substantial charm quark density such as the one proposed by Cornet et al.

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