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

• Autores: Bozzi, G.; Catani, S.; De Florian, D.; Grazzini, M.
• Año de publicación: 2003
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Phys Lett Sect B Nucl Elem Part High-Energy Phys 2003;564(1-2):65-72
• Materia: accuracy; article; calculation; elementary particle; oscillation; quantum mechanics; spectrum; theory
• Institución: Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales

We consider the transverse-momentum (qT) distribution of Higgs bosons produced at hadron colliders. We use a formalism that uniformly treats both the small-qT and large-qT regions in QCD perturbation theory. At small qT (qT ≪ MH, MH 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 qT (qT ≳ MH), 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-qT region. In this region, the introduction of unjustified higher-order terms is avoided by imposing unitarity constraints, so that the integral of the qT 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 qT distribution are quite stable with respect to perturbative QCD uncertainties. © 2003 Elsevier Science B.V. All rights reserved.
Fil:De Florian, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.