Effective charge from lattice QCD
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 chargee, Owing to the dynamical breaking of scale invariance, ...
| Autores: | , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad Pablo de Olavide (UPO) |
| Repositorio: | RIO. Repositorio Institucional Olavide |
| Idioma: | inglés |
| OAI Identifier: | oai:rio.upo.es:10433/22796 |
| Acceso en línea: | https://hdl.handle.net/10433/22796 |
| Access Level: | acceso abierto |
| Palabra clave: | QCD Lattice |
| Sumario: | 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 chargee, Owing to the dynamical breaking of scale invariance, evident in the emergence of a gluon mass-scale, Amongst other things: ˆ(k2) ˆ(k2) m0 043(1) GeV, this coupling saturates at infrared momenta: ˆ(0) 097(4) . 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 ˆ(k2) 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 welldefined quantum field theory in four dimensions. Keywords: running coupling, quantum chromodynamics, Dyson-Schwinger equations, lattice field theory, emergence of mass, confinement |
|---|