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Título: | Effective charge from lattice QCD |
Autor: | Cui, Z.F.; Zhang, J. L.; Binosi, Daniele; De Soto, F.; Mezrag, C.; Papavassiliou, Joannis CSIC ORCID CVN; Roberts, Craig D.; Rodríguez-Quintero, J.; Segovia, J.; Zafeiropoulos, S. | Fecha de publicación: | jun-2020 | Editor: | Institute of Physics Publishing | Citación: | Chinese Physics C 44: 083102 (2020) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1088/1674-1137/44/8/083102 | URI: | http://hdl.handle.net/10261/234930 | DOI: | 10.1088/1674-1137/44/8/083102 | Identificadores: | doi: 10.1088/1674-1137/44/8/083102 issn: 1674-1137 |
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