Universality of transverse-momentum resummation and hard factors at the NNLO
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 ha...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_05503213_v881_n1_p414_Catani |
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todo:paper_05503213_v881_n1_p414_Catani2023-10-03T15:34:23Z Universality of transverse-momentum resummation and hard factors at the NNLO Catani, S. Cieri, L. de Florian, D. Ferrera, G. Grazzini, M. 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. © 2014 The Authors. Fil:Cieri, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:de Florian, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_05503213_v881_n1_p414_Catani |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
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. © 2014 The Authors. |
| format |
JOUR |
| author |
Catani, S. Cieri, L. de Florian, D. Ferrera, G. Grazzini, M. |
| spellingShingle |
Catani, S. Cieri, L. de Florian, D. Ferrera, G. Grazzini, M. Universality of transverse-momentum resummation and hard factors at the NNLO |
| author_facet |
Catani, S. Cieri, L. de Florian, D. Ferrera, G. Grazzini, M. |
| author_sort |
Catani, S. |
| title |
Universality of transverse-momentum resummation and hard factors at the NNLO |
| title_short |
Universality of transverse-momentum resummation and hard factors at the NNLO |
| title_full |
Universality of transverse-momentum resummation and hard factors at the NNLO |
| title_fullStr |
Universality of transverse-momentum resummation and hard factors at the NNLO |
| title_full_unstemmed |
Universality of transverse-momentum resummation and hard factors at the NNLO |
| title_sort |
universality of transverse-momentum resummation and hard factors at the nnlo |
| url |
http://hdl.handle.net/20.500.12110/paper_05503213_v881_n1_p414_Catani |
| work_keys_str_mv |
AT catanis universalityoftransversemomentumresummationandhardfactorsatthennlo AT cieril universalityoftransversemomentumresummationandhardfactorsatthennlo AT defloriand universalityoftransversemomentumresummationandhardfactorsatthennlo AT ferrerag universalityoftransversemomentumresummationandhardfactorsatthennlo AT grazzinim universalityoftransversemomentumresummationandhardfactorsatthennlo |
| _version_ |
1782023694649917440 |