Towards NLO calculations in the parton Reggeization approach

Abstract

Parton Reggeization approach is the scheme of kT-factorization for multiscale hard processes, which is based on the Lipatov's gauge invariant effective field theory (EFT) for high energy processes in QCD. The new type of rapidity divergences, associated with the log 1/x-corrections, appears in the loop corrections in this formalism. The covariant procedure of regularization of rapidity divergences, preserving the gauge invariance of effective action is described. As an example application, the one-loop correction to the propagator of Reggeized quark and gamma Q q -scattering vertex are computed. Obtained results are used to construct the Regge limit of one-loop gamma+gamma -> q + barq amplitude. The cancelation of rapidity divergences and consistency of the EFT prediction with the full QCD result is demonstrated. The rapidity renormalization group within the EFT is discussed.

arXiv comment6 pages, 2 figures, talk at the HSQCD-2016

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Cited by in corpus (5)

• Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approach
• Charm quark and meson production in association with single-jet at the LHC
• DIS structure functions in the NLO approximation of the Parton Reggeization Approach
• Calculating off-shell one-loop amplitudes for $k_T$-dependent factorization: a proof of concept
• One-loop amplitudes with an off-shell gluon