Year: 2020
Type: article
Abstract: Using lattice configurations for quantum chromodynamics (QCD) generated with three domain-wall fermions at a physical pion mass, we obtain a parameter-free prediction of QCD’s renormalisation-group-invariant process-independent effective charge, . Owing to the dynamical breaking of scale invariance, evident in the emergence of a gluon mass-scale, GeV, this coupling saturates at infrared momenta: . Amongst other things: is almost identical to the process-dependent (PD) effective charge defined via the Bjorken sum rule; and also that PD charge which, employed in the one-loop evolution equations, delivers agreement between pion parton distribution functions computed at the hadronic scale and experiment. The diversity of unifying roles played by suggests that it is a strong candidate for that object which represents the interaction strength in QCD at any given momentum scale; and its properties support a conclusion that QCD is a mathematically well-defined quantum field theory in four dimensions.
Source: Chinese Physics C
Authors: Z.-F. Cui, J.-L. Zhang, D. Binosi, F. De Soto, C. Mezrag, J. Papavassiliou, C. D. Roberts, J. Rodríguez-Quintero, J. Segovia, S. Zafeiropoulos
Institutions: Nanjing University, Nanjing Normal University, European Centre for Theoretical Studies in Nuclear Physics and Related Areas, Universidad Pablo de Olavide, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Universitat de València, Universidad de Huelva, Centre National de la Recherche Scientifique, Université de Toulon, Aix-Marseille Université
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,410
Funders: National Natural Science Foundation of China, Government of Jiangsu Province, Ministerio de Economía y Competitividad, Generalitat Valenciana, Natural Science Foundation of Jiangsu Province, Grand Équipement National De Calcul Intensif, Institut National de Physique Nucléaire et de Physique des Particules
OpenAlex ID: W2996497496