Speaker
Description
Precision physics in the Higgs sector has been one of the main challenges in recent years. The pure fixed-order calculations entering in the \textit{collinear factorization} framework, which have been pushed up to N3LO, are not able to describe the entire kinematic spectrum. In particular conditions, they must be necessarily supplemented by all-order \textit{resummations}; for instance, in the so called \textit{Regge} kinematical region, large energy-type logarithms spoil the perturbative behavior of the series and must be resummed to all orders. This resummation is necessary to describe the inclusive hadroproduction of a forward Higgs in the limit of small Bjorken $x$, as well to study inclusive forward emissions of a Higgs boson in association with a backward identified object. A complete resummation for these processes, at next-to-leading logarithmic accuracy (NLLA), can be achived through the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach, but it requires the knowledge of the next-to-leading order Higgs impact factor. We present the full NLO result for the impact factor of a forward Higgs boson, obtained in the infinite top-mass limit, both in the momentum representation and as superposition of the eigenfunctions of the LO BFKL kernel. We also discuss the application of the result to the inclusive hadroproduction of a Higgs boson in association with a jet.
