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Testing non-linear evolution with running coupling corrections in ep and pp collisions

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Abstract

Perturbative QCD predicts that the growth of the gluon density at small x (high energies) should saturate, forming a Color Glass Condensate (CGC), which is described in mean field approximation by the Balitsky–Kovchegov (BK) equation. Recently, the next-to-leading order corrections for the BK equation were derived and a global fit of the inclusive ep HERA data was performed, resulting in a parameterization for the forward scattering amplitude. In this paper we compare this parameterization with the predictions of other phenomenological models and investigate the saturation physics in diffractive deep-inelastic electron–proton scattering and in the forward hadron production in pp collisions. Our results demonstrate that the running coupling BK solution is able to describe these observables.

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Authors and Affiliations

  1. Conjunto Agrotécnico Visconde da Graça (CAVG), Universidade Federal de Pelotas, Av. Ildefonso Simes Lopes, 2791, CEP 96060-290, Pelotas, RS, Brazil

    M. A. Betemps

  2. High and Medium Energy Group (GAME), Instituto de Física e Matemática, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-900, Pelotas, RS, Brazil

    M. A. Betemps, V. P. Gonçalves & J. T. de Santana Amaral

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  1. M. A. Betemps
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  2. V. P. Gonçalves
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  3. J. T. de Santana Amaral
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Correspondence to V. P. Gonçalves.

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Betemps, M.A., Gonçalves, V.P. & de Santana Amaral, J.T. Testing non-linear evolution with running coupling corrections in ep and pp collisions. Eur. Phys. J. C 66, 137–146 (2010). https://doi.org/10.1140/epjc/s10052-009-1225-6

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