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Quark loop contribution to BFKL evolution: Running coupling and leading-N_f NLO intercept

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arxiv hep-ph/0612071 v2 pith:ET6XJPW2 submitted 2006-12-06 hep-ph

Yuri V. Kovchegov (The Ohio State University) , Heribert Weigert (University of Bielefeld) This is my paper · ORCID
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keywords bfklcontributioncouplingequationinterceptleading-nquarkrunning
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We study the sea quark contribution to the BFKL kernel in the framework of Mueller's dipole model using the results of our earlier calculation. We first obtain the BFKL equation with the running coupling constant. We observe that the ``triumvirate'' structure of the running coupling found previously for non-linear evolution equations is preserved for the BFKL equation. In fact, we rederive the equation conjectured by Levin and by Braun, albeit for the unintegrated gluon distribution with a slightly unconventional normalization. We obtain the leading-N_f contribution to the NLO BFKL kernel in transverse momentum space and use it to calculate the leading-N_f contribution to the NLO BFKL pomeron intercept for the unintegrated gluon distribution. Our result agrees with the well-known results of Camici and Ciafaloni and of Fadin and Lipatov. We show how to translate this intercept to the case of the quark dipole scattering amplitude and find that it maps onto the expression found by Balitsky.

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