摘要
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,α^(k2).Owing to the dynamical breaking of scale invariance,evident in the emergence of a gluon mass-scale,m0=0.43(1)GeV,this coupling saturates at infrared momenta:α^(0)/π=0.97(4).Amongst other things:α^(k2)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 byα^(k^2)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.
作者
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
崔著钫;张金利;D.Binosi;F.De Soto;C.Mezrag;J.Papavassiliou;C.D.Roberts;J.Rodríguez-Quintero;J.Segovia;S.Zafeiropoulos(School of Physics,Nanjing University,Nanjing 210093,China;Institute for Nonperturbative Physics,Nanjing University,Nanjing 210093,China;Department of Physics,Nanjing Normal University,Nanjing 210023,China;European Centre for Theoretical Studies in Nuclear Physics and Related Areas,Villa Tambosi,Strada delle Tabarelle 286,I-38123 Villazzano(TN),Italy;Dpto.Sistemas Físicos,Químicos y Naturales,Univ.Pablo de Olavide,E-41013 Sevilla,Spain 6.IRFU,CEA,UniversitéParis-Saclay,F-91191 Gif-sur-Yvette,France;Department of Theoretical Physics and IFIC,University of Valencia and CSIC,E-46100,Valencia,Spain;Department of Integrated Sciences and Center for Advanced Studies in Physics,Mathematics and Computation;University of Huelva,E-21071 Huelva,Spain;Aix Marseille Univ,Universitéde Toulon,CNRS,CPT,Marseille,France)
