RT Journal Article
T1 Effective charge from lattice QCD
A1 Cui, Zhu-Fang
A1 Zhang, J. L.
A1 Binosi, Daniele
A1 Rodríguez Quintero, José
AB Using lattice configurations for quantum chromodynamics (QCD) generated with three domain-wall fermionsat 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 emergenceof 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 theBjorken sum rule; and also that PD charge which, employed in the one-loop evolution equations, delivers agreementbetween pion parton distribution functions computed at the hadronic scale and experiment. The diversity of unifyingroles played by α(k2) suggests that it is a strong candidate for that object which represents the interaction strength inQCD at any given momentum scale; and its properties support a conclusion that QCD is a mathematically welldefinedquantum field theory in four dimensions.
PB IOP Publishing
SN 1674-1137
YR 2020
FD 2020-06
LK http://hdl.handle.net/10272/18630
UL http://hdl.handle.net/10272/18630
LA eng
NO Cui, Z. F., Zhang, J. L., Binosi, D. ... Rodríguez Quintero, J. (2020). Effective charge from lattice QCD. Chinese Physics C, 44(8), 083102. DOI: https://doi.org/10.1088/1674-1137/44/8/083102
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026