Heavy quark production in $γγ$ collisions: a theoretical reappraisal

Details Heavy quark production in $γγ$ collisions: a theoretical reappraisal Heavy quark production in $γγ$ collisions: a theoretical reappraisal

2000-10-13

arxiv.org/abs/hep-ph/0010140v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

Heavy quark production in $\gamma\gamma$ collisions is reanalyzed. It is argued that evaluating the cross section $\sigma(\gamma\gamma\to Q\overline{Q})$ in a well-defined renormalization scheme requires the inclusion of direct photon contributions up to the order $\alpha^2\alpha_s^2$. The order $\alpha^2\alpha_s^2$ 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 $\sigma(\gamma\gamma\to Q\overline{Q})$ is emphasized as the only way of estimating the theoretical uncertainty related to the ambiguity in choosing these scales.

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