Non-linear equation in the re-summed next-to-leading order of perturbative QCD: the leading twist approximation

Carlos Contreras, Eugene Levin, Rodrigo Meneses, Michael Sanhueza

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we use the re-summation procedure, suggested in Ducloué et al. (JHEP 1904:081, 2019), Salam (JHEP 9807:019 1998), Ciafaloni et al. (Phys Rev D 60:1140361999) and Ciafaloni et al. (Phys Rev D 68:114003, 2003), to fix the BFKL kernel in the NLO. However, we suggest a different way to introduce the non-linear corrections in the saturation region, which is based on the leading twist non-linear equation. In the kinematic region: τ≡r2Qs2(Y)≤1, where r denotes the size of the dipole, Y its rapidity and Qs the saturation scale, we found that the re-summation contributes mostly to the leading twist of the BFKL equation. Assuming that the scattering amplitude is small, we suggest using the linear evolution equation in this region. For τ>1 we are dealing with the re-summation of (α¯Slnτ)n and other corrections in NLO approximation for the leading twist. We find the BFKL kernel in this kinematic region and write the non-linear equation, which we solve analytically. We believe the new equation could be a basis for a consistent phenomenology based on the CGC approach.

Original languageEnglish
Article number1029
JournalEuropean Physical Journal C
Volume80
Issue number11
DOIs
StatePublished - 1 Nov 2020

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