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The q_T spectrum of the Higgs boson at the LHC in QCD perturbation theory

G. Bozzi·S. Catani·D. de Florian·M. Grazzini
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Abstract

We consider the transverse-momentum (q_T) distribution of Higgs bosons produced at hadron colliders. We use a formalism that uniformly treats both the small-q_T and large-q_T regions in QCD perturbation theory. At small q_T (q_T << M_H, M_H being the mass of the Higgs boson), we implement an all-order resummation of logarithmically-enhanced contributions up to next-to-next-to-leading logarithmic accuracy. At large q_T (q_T \gtap M_H), we use fixed-order perturbation theory up to next-to-leading order. The resummed and fixed-order approaches are consistently matched by avoiding double-counting in the intermediate-q_T region. In this region, the introduction of unjustified higher-order terms is avoided by imposing unitarity constraints, so that the integral of the q_T spectrum exactly reproduces the perturbative result for the total cross section up to next-to-next-to-leading order. Numerical results at the LHC are presented. These show that the main features of the q_T distribution are quite stable with respect to perturbative QCD uncertainties.

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G. Bozzi, S. Catani, D. de Florian, M. Grazzini. 2003-02-13. The q_T spectrum of the Higgs boson at the LHC in QCD perturbation theory. https://doi.org/10.1016/s0370-2693(03)00656-7

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