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

R. Enberg·B. Pire·L. Szymanowski·S. Wallon
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Abstract

We calculate the leading order BFKL amplitude for the exclusive diffractive process γ*_L(Q1^2) γ*_L(Q2^2) \to ρ_L^0 ρ_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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R. Enberg, B. Pire, L. Szymanowski, S. Wallon. 2007-07-06. BFKL resummation effects in gamma* gamma* --> rho rho. https://doi.org/10.1140/epjc%2Fs10052-007-0375-7%2010.1140%2Fepjc%2Fs2005-02451-2

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