Data di Pubblicazione:
2014
Citazione:
Universality of transverse-momentum resummation and hard factors at the NNLO / S. Catani, L. Cieri, D. de Florian, G. Ferrera, M. Grazzini. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - 881:1(2014), pp. 414-443.
Abstract:
We consider QCD radiative corrections to the production of colorless high-mass systems in hadron collisions. The logarithmically-enhanced contributions at small transverse momentum are treated to all perturbative orders by a universal resummation formula that depends on a single process-dependent hard factor. We show that the hard factor is directly related to the all-order virtual amplitude of the corresponding partonic process. The direct relation is universal (process-independent), and it is expressed by an all-order factorization formula that we explicitly evaluate up to the next-to-next-to-leading order (NNLO) in QCD perturbation theory. Once the NNLO scattering amplitude is available, the corresponding hard factor is directly determined: it controls NNLO contributions in resummed calculations at full next-to-next-to-leading logarithmic accuracy, and it can be used in applications of the q T subtraction formalism to perform fully-exclusive perturbative calculations up to NNLO. The universality structure of the hard factor and its explicit NNLO form are also extended to the related formalism of threshold resummation.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
High Energy Physics - Phenomenology; High Energy Physics - Phenomenology; Nuclear and High Energy Physics
Elenco autori:
S. Catani, L. Cieri, D. de Florian, G. Ferrera, M. Grazzini
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