DE FLORIAN daniel Enrique
Transverse-Momentum Resummation and the Spectrum of the Higgs Boson at the LHC
GIUSSEPE BOZZI; STEFANO CATANI; DANIEL DE FLORIAN; MASSIMILIANO GRAZZINI
NUCLEAR PHYSICS B
ELSEVIER SCIENCE BV
Año: 2006 vol. 737 p. 73 - 73
We consider the transverse-momentum (qT ) distribution of generic high-mass systems (lepton pairs, vec- tor bosons, Higgs particles, . . . ) produced in hadron collisions. At small qT , 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 qT , they are constrained by perturbative unitarity to give a vanishing contribution to the total cross section. At interme- diate and large qT , 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 uphigh stability with respect to perturbative QCD uncertainties.