Transverse-momentum resummation and the spectrum of the Higgs boson at the LHC
Aug, 2005
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Abstract: (Elsevier)
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.- p p: inclusive reaction
- Higgs particle: hadroproduction
- transverse momentum: spectrum
- quantum chromodynamics
- perturbation theory: higher-order
- leading logarithm approximation: higher-order
- impact parameter
- form factor: Sudakov
- numerical calculations: CERN LHC Coll
- 14000 GeV-cms
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