2001/01/31 by J. H. Field, J.H. Field · 63 citations
Physics and Astronomy · #Gluon #Hadron #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ph
paper · pdf · doi:10.1103/physrevd.66.013013
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 66(1) (American Physical Society) · 50 pages, 11 figures, 15 tables
arxiv created 2002/05/14 · openalex publication_date 2002/07/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The shapes of the inclusive photon spectra in the processes J/\stackrel\ensuremath→\ensuremathψ\ensuremathγX and \stackrel\ensuremath→\ensuremathΥ\ensuremathγX have been analyzed using all available experimental data. Relativistic, higher order QCD, and gluon mass corrections were taken into account in the fitted functions. Only on including the gluon mass corrections were consistent and acceptable fits obtained. Values of 0.721_\ensuremath-0.068+0.016 GeV and 1.18_\ensuremath-0.29+0.09 GeV were found for the effective gluon masses (corresponding to Born level diagrams) for J/\ensuremathψ and \ensuremathΥ, respectively. The width ratios \ensuremathΓ(\stackrel\ensuremath→Vhadrons)/\ensuremathΓ(\stackrel\ensuremath→V\ensuremathγ+hadrons)V=J/\ensuremathψ,\ensuremathΥ, were used to determine \ensuremathαs(1.5 GeV) and \ensuremathαs(4.9 GeV). Values consistent with the current world average \ensuremathαs were obtained only when gluon mass correction factors, calculated using the fitted values of the effective gluon mass, were applied. A gluon mass \ensuremath≃1 GeV, as suggested by these results, is consistent with previous analytical theoretical calculations and independent phenomenological estimates, as well as with a recent, more accurate, lattice calculation of the gluon propagator in the infrared region.