Photon-parton splitting functions at the next-to-next-to-leading order of QCD

被引：0
|
作者：
Vogt, A
Moch, S
Vermaseren, J
机构：
[1] Univ Durham, Dept Phys, IPPP, Durham DH1 3LE, England
[2] DESY, Deutsch Elektronensynchrotron, D-15735 Zeuthen, Germany
[3] NIKHEF Theory Grp, NL-1098 SJ Amsterdam, Netherlands
来源：
ACTA PHYSICA POLONICA B | 2006年 / 37卷 / 03期
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have calculated the splitting functions governing the evolution of the impolarized parton distributious of the photon at the next-to-next-to-leading order (NNLO) of massless perturbative QCD. The results, presented here mainly in terms of compact and accurate parametrizations, are consistent with our previous approximations based on the lowest six even-integer Mellin moments. Consequently the NNLO corrections are small in both the (MS) over bar and the DIS gamma factorization schemes at momentum fractions x greater than or similar to 0.1.
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页码：683 / 687
页数：5
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