BFKL resummation effects in gamma* gamma* --> rho rho

Details BFKL resummation effects in gamma* gamma* --> rho rho BFKL resummation effects in gamma* gamma* --> rho rho

2005-08-11

arxiv.org/abs/hep-ph/0508134v3

Eur.Phys.J.C45:759-769,2006; Erratum-ibid.C51:1015,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 13 figures. Numerical bug affecting plots in Figs 12 and 13 corrected

Scientific paper

10.1140/epjc/s10052-007-0375-7

We calculate the leading order BFKL amplitude for the exclusive diffractive process \gamma*_L(Q1^2) \gamma*_L(Q2^2) \to \rho_L^0 \rho_L^0 in the forward direction, which can be studied in future high energy e^+e^- linear colliders. The resummation effects are very large compared to the fixed-order calculation. We also estimate the next-to-leading logarithmic corrections to the amplitude by using a specific resummation of higher order effects and find a substantial growth with energy, but smaller than in the leading logarithmic approximation.

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