Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-05
Nucl.Phys.B737:73-120,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
48 pages, 13 postscript figures
Scientific paper
10.1016/j.nuclphysb.2005.12.022
We consider the transverse-momentum (q_T) distribution of generic high-mass systems (lepton pairs, vector bosons, Higgs particles, ....) produced in hadron collisions. At small q_T, we concentrate on the all-order resummation of the logarithmically-enhanced contributions in QCD perturbation theory. We elaborate on the $b$-space resummation formalism and introduce some novel features: the large logarithmic contributions are systematically exponentiated in a process-independent form and, after integration over q_T, they are constrained by perturbative unitarity to give a vanishing contribution to the total cross section. At intermediate and large q_T, resummation is consistently combined with fixed-order perturbative results, to obtain predictions with uniform theoretical accuracy over the entire range of transverse momenta. The formalism is applied to Standard Model Higgs boson production at LHC energies. We combine the most advanced perturbative information available at present for this process: resummation up to next-to-next-to-leading logarithmic accuracy and fixed-order perturbation theory up to next-to-leading order. The results show a high stability with respect to perturbative QCD uncertainties.
Bozzi Giuseppe
Catani Stefano
de Florian Daniel
Grazzini Massimiliano
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