Extracting infrared QCD coupling from meson spectrum

Extracting infrared QCD coupling from meson spectrum

In the framework of the Bethe-Salpeter formalism used in previous papers to evaluate the quarkonium spectrum, here we reverse the point of view to extract an 'experimental' running coupling in the infrared (IR) region from the data. The values so obtained agree within the erros with the Sh...

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Veröffentlicht in:AIP conference proceedings 2007-01, Vol.892 (1), p.340-342
Hauptverfasser: Baldicchi, M, Prosperi, G M, Simolo, C
Format: Artikel
Sprache:eng
Schlagworte:
BETHE-SALPETER EQUATION
COUPLING
COUPLING CONSTANTS
FOUR MOMENTUM TRANSFER
GEV RANGE
MESON SPECTROSCOPY
MEV RANGE
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
QUARKONIUM
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Zusammenfassung:In the framework of the Bethe-Salpeter formalism used in previous papers to evaluate the quarkonium spectrum, here we reverse the point of view to extract an 'experimental' running coupling in the infrared (IR) region from the data. The values so obtained agree within the erros with the Shirkov-Solovtsov analytic coupling for 200 MeV < Q < 1.2 GeV, thus giving a very satisfactory unifying description of high and low energy phenomena. Below 1 GeV seems to vanish as Q- > 0. The paper is based on a work in progress in collaboration with D. V. Shirkov.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2714412