Artículo
Soft-gluon effective coupling: perturbative results and the large-nF limit to all orders
Catani, Stefano; de Florian, Daniel Enrique
; Devoto, Simone; Grazzini, Massimiliano; Mazzitelli, Javier
Fecha de publicación:
11/2023
Editorial:
Springer
Revista:
Journal of High Energy Physics
ISSN:
1029-8479
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We consider extensions of the soft-gluon effective coupling that generalize the Catani-Marchesini-Webber (CMW) coupling in the context of soft-gluon resummation beyond the next-to-leading logarithmic accuracy. Starting from the probability density of correlated soft emission in d dimensions we introduce a class of soft couplings relevant for resummed QCD calculations of hard-scattering observables. We show that at the conformal point, where the d-dimensional QCD β function vanishes, all these effective couplings are equal and they are also equal to the cusp anomalous dimension. We present explicit results in d dimensions for the soft-emission probability density and the soft couplings at the second-order in the QCD coupling α S. In d = 4 dimensions we obtain the explicit relation between the soft couplings at O (αS3). Finally, we study the structure of the soft coupling in the large-nF limit and we present explicit expressions to all orders in perturbation theory. We also check that, at the conformal point, our large-nF results agree with the known result of the cusp anomalous dimension.
Palabras clave:
HIGHER-ORDER PERTURBATIVE CALCULATIONS
,
RESUMMATION
,
THE STRONG COUPLING
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Articulos (ICIFI)
Articulos de INSTITUTO DE CIENCIAS FISICAS
Articulos de INSTITUTO DE CIENCIAS FISICAS
Citación
Catani, Stefano; de Florian, Daniel Enrique; Devoto, Simone; Grazzini, Massimiliano; Mazzitelli, Javier; Soft-gluon effective coupling: perturbative results and the large-nF limit to all orders; Springer; Journal of High Energy Physics; 2023; 11; 11-2023; 1-24
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