Perturbative stability of the QCD predictions for single spin asymmetry in heavy quark photoproduction

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• 作者：Ivanov ; N.Ya.
• 关键词：12.38.Bx ; 13.88.+e ; 13.85.Ni ; Perturbative QCD ; Heavy flavor photoproduction ; Single spin asymmetry
• 刊名：Nuclear Physics B
• 出版年：2001
• 期刊代码：45_05503213
• 类别：ph
• 出版时间：November 12, 2001
• 卷：615
• 期：1-3
• 页码：266-284
• 文件大小：216 K

摘要

We present the threshold resummation for the single spin asymmetry in heavy flavor production by linearly polarized photons. We analyze the soft-gluon contributions to the asymmetry at fixed order in α_s to the next-to-leading logarithmic accuracy. Our analysis shows that, contrary to the production cross section, the azimuthal asymmetry is practically insensitive to soft radiation. Our calculations of the asymmetry up to the 6th order in α_s lead only to small corrections (of order of few percent) to the Born predictions at energies of the fixed target experiments. Fast convergence of the perturbative series for the azimuthal asymmetry is due to the factorization properties of the photon–hadron cross section. We conclude that measurements of the single spin asymmetry would provide an excellent test of pQCD applicability to heavy flavor production.