Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-13
Phys.Lett. B564 (2003) 65-72
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 2 postscript figures
Scientific paper
10.1016/S0370-2693(03)00656-7
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.
Bozzi Giuseppe
Catani Stefano
de Florian Daniel
Grazzini Massimiliano
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