Renormalization group improved photon impact factors and the high energy virtual photon scattering

Dimitri Colferai, Wanchen Li, Anna M. Staśto

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We perform the renormalization group improved collinear resummation of the photon-gluon impact factors. We construct the resummed cross section for virtual photon-photon (γ γ ) scattering which incorporates the impact factors and BFKL gluon Green’s function up to the next-to-leading logarithmic accuracy in energy. The impact factors include important kinematical effects which are responsible for the most singular poles in Mellin space at next-to-leading order. Further conditions on the resummed cross section are obtained by requiring the consistency with the collinear limits. Our analysis is consistent with previous impact factor calculations at NLO, apart from a new term proportional to CF that we find for the longitudinal polarization. Finally, we use the resummed cross section to compare with the LEP data on the γ γ cross section and with previous calculations. The resummed result is lower than the leading logarithmic approximation but higher than the pure next-to-leading one, and is consistent with the experimental data.

Original languageEnglish (US)
Article number106
JournalJournal of High Energy Physics
Issue number1
StatePublished - Jan 2024

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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