Effective charge from lattice QCD

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

作者机构：School of PhysicsNanjing UniversityNanjing 210093China Institute for Nonperturbative PhysicsNanjing UniversityNanjing 210093China Department of PhysicsNanjing Normal UniversityNanjing 210023China European Centre for Theoretical Studies in Nuclear Physics and Related AreasVilla TambosiStrada delle Tabarelle 286I-38123 Villazzano(TN)Italy Dpto.Sistemas FísicosQuímicos y NaturalesUniv.Pablo de OlavideE-41013 SevillaSpain 6.IRFUCEAUniversitéParis-SaclayF-91191 Gif-sur-YvetteFrance Department of Theoretical Physics and IFICUniversity of Valencia and CSICE-46100ValenciaSpain Department of Integrated Sciences and Center for Advanced Studies in PhysicsMathematics and Computation University of HuelvaE-21071 HuelvaSpain Aix Marseille UnivUniversitéde ToulonCNRSCPTMarseilleFrance 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2020年第44卷第8期

页      面：23-32页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0702[理学-物理学] 

基　　金：Our calculations benefited from the following resources: CINES, GENCI, IDRIS(Project) the IN2P3 Computing Facility. Work supported by National Natural Science Foundation of China 江苏省自然科学基金 Jiangsu Province Hundred Talents Plan for Professionals Generalitat Valenciana Spanish Ministry of Economy and Competitiveness(MINECO) 

主　　题：running coupling quantum chromodynamics Dyson-Schwinger equations lattice field theory emer-gence of mass confinement 

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 *** 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.