Di-electron and two-photon widths in charmonium

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S106377880907014X· OSTI ID:21405868

Danilkin, I V ^[1]

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1. Moscow Engineering Physics Institute (Russian Federation)

The vector and pseudoscalar decay constants are calculated in the framework of the Field Correlator Method. Di-electron widths: {Gamma}{sub ee}(J/{psi}) = 5.41 keV, {Gamma}{sub ee}({psi}'(3686)) = 2.47 keV, {Gamma}{sub ee}({psi}''(3770)) = 0.248 keV, in good agreement with experiment, are obtained with the same coupling, {alpha}{sub s} = 0.165, in the QCD radiative corrections. We show that the larger {alpha}{sub s} = 0.191 {+-} 0.004 is needed to reach agreement with experiment for {Gamma}{sub {gamma}{gamma}}({chi}c) = 7.22 keV, {Gamma}{sub {gamma}{gamma}}({chi}c({sup 3}P0)) = 3.3 keV, {Gamma}{sub {gamma}{gamma}}{chi}c({sup 3}P{sub 2}) = 0.54 keV, and also for {Gamma}(J/{psi} {yields} 3g) = 59.5 keV, {Gamma}(J/{psi} {yields} {gamma}2g) = 5.7 keV. Meanwhile, even larger {alpha}{sub s} = 0.238 gives rise to good description of {Gamma}({psi}' {yields} 3g) = 52.7 keV, {Gamma}({psi}' {yields} {gamma} 2g) = 3.5 keV, and provides correct ratio of the branching fractions: {Beta} (J/{psi} {yields} light hadrons)/{Beta} ({psi}' {yields} light hadrons) = 0.24.

• OSTI ID: 21405868
• Journal Information: Physics of Atomic Nuclei, Vol. 72, Issue 7; Other Information: DOI: 10.1134/S106377880907014X; Copyright (c) 2009 Pleiades Publishing, Ltd.; ISSN 1063-7788
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CHARMONIUM
COLOR MODEL
DECAY
ELECTRONS
J PSI-3097 MESONS
KEV RANGE
PARTICLE MODELS
PARTICLE WIDTHS
PHOTONS
PSEUDOSCALAR MESONS
PSI-3770 MESONS
QUANTUM CHROMODYNAMICS
RADIATIVE CORRECTIONS
BOSONS
COMPOSITE MODELS
CORRECTIONS
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
HADRONS
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
VECTOR MESONS