Year: 2025
Type: article
Abstract: It has long been known that the gluon propagator in Landau-gauge QCD exhibits a mass gap; and its emergence has been ascribed to the action of the Schwinger mechanism in the gauge sector of QCD. In the present work, we relate this property to the physical mass gap of QCD by considering two observables associated with confinement and chiral symmetry breaking, namely the confinement-deconfinement transition temperature and the pion decay constant, respectively. It turns out that the first observable is linearly proportional to the gluon mass gap, a fact that allows us to assign a direct physical meaning to this scale. Moreover, we identify three distinct momentum regimes in the gluon propagator, ultraviolet, intermediate, and deep infrared, and assess their impact on the aforementioned observables. Both observables are sensitive to the first two regions of momenta, where functional approaches essentially coincide, but are insensitive to the third, deep infrared, regime. The combined information is used for a simple fit for the gluon propagator, all of whose parameters admit a clear physical interpretation. Finally, we discuss how this fit can help us access the intertwined dynamics of confinement and chiral symmetry breaking in QCD-type theories.
Source: The European Physical Journal C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: Ministerio de Ciencia, Innovación y Universidades, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Generalitat Valenciana, Ministerio de Ciencia e Innovación, Emberi Eroforrások Minisztériuma, Agencia Estatal de Investigación, Conselleria de Cultura, Educación y Ciencia, Generalitat Valenciana, ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung
Awards: G1170463422, G1570660777, G1610934229, G2185543607, G2687764989, G2917513873, G3176647223, G4014979219, G4511208782, G5222023348, G5805502524, G6526081583, G6731524417, EXC 2181: STRUKTUREN: Emergenz in Natur, Mathematik und komplexen Daten, G714608666, G7299807396, G7403142628, G7705497243, G8092417792, G8269025138, G8302083189, SFB 1225: Isolierte Quantensysteme und Universalität unter extremen Bedingungen (ISOQUANT), G948230370
OpenAlex ID: W4416462091