文章基本信息

标题：Parton distributions in the virtual photon up to NNLO in QCD and factorization scheme dependence
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作者：K. Sasaki ; T. Ueda ; T. Uematsu 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2007
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Parton distributions in the virtual photon target are investigated in perturbative QCD up to the next-to-next-to-leading order (NNLO). In the case Λ2 􀀀 P2 􀀀 Q2, where Q2 (P2) is the mass squared of the probe (target) photon, parton distributions are predicted completely up to the NNLO, but they are factorization-scheme-dependent. We analyze parton distributions in two different factorization schemes, namely MS and DISγ schemes, and discuss their scheme dependence. We show that the factorization-scheme dependence is characterized by the large-x behaviors of quark distributions in the virtual photon. Gluon distribution is predicted to be very small in absolute value except in the small-x region.