Heavy quark production in γγ collisions: a theoretical reappraisal

2000/10/13 by Jiri Chyla, Chyla, Jiri
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0010140

16 pages, JHEP style, 5 figures in EPS format, Substantial extension of and elaboration on the previous version, basic conclusion unchanged

arxiv created 2001/05/09 · arxiv updated 2009/11/30

Abstract

Heavy quark production in γγ collisions is reanalyzed. It is argued that evaluating the cross section σ(γγ→ QQ) in a well-defined renormalization scheme requires the inclusion of direct photon contributions up to the order α²α_s². The order α²α_s² direct photon contributions are furthermore needed for factorization scale invariance of the sum of direct and resolved photon contributions. The importance of quantitative analysis of renormalization and factorization scale dependence of the approximation currently used for the evaluation of σ(γγ→ QQ) is emphasized as the only way of estimating the theoretical uncertainty related to the ambiguity in choosing these scales.

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