Gluon content of the {eta} and {eta}{sup '} mesons and the {eta}{gamma} , {eta}{sup '}{gamma} electromagnetic transition form factors

Journal Article · Wed Sep 01 04:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.054020· OSTI ID:20705142

Agaev, S S; Stefanis, N G ^[1]

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1. High Energy Physics Laboratory, Baku State University, Z. Khalilov Street 23, 370148 Baku (Azerbaijan)

We compute power-suppressed corrections to the {eta}{gamma} and {eta}{sup '}{gamma} transition form factors Q{sup 2}F{sub {eta}}{sub ({eta}}{sub {sup '}}{sub {gamma}}(Q{sup 2}) arising from the end point regions x{yields}0,1 by employing the infrared-renormalon approach. The contribution to the form factors from the quark and gluon content of the {eta},{eta}{sup '} mesons is taken into account using for the {eta}-{eta}{sup '} mixing the SU{sub f}(3) singlet {eta}{sub 1} and octet {eta}{sub 8} basis. The theoretical predictions obtained this way are compared with the corresponding CLEO data and restrictions on the input parameters (Gegenbauer coefficients) B{sub 2}{sup q}({eta}{sub 1}), B{sub 2}{sup g}({eta}{sub 1}), and B{sub 2}{sup q}({eta}{sub 8}) in the distribution amplitudes for the {eta}{sub 1},{eta}{sub 8} states with one nonasymptotic term are deduced. Comparison is made with the results from QCD perturbation theory.

• OSTI ID: 20705142
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 70; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
CESR STORAGE RING
COMPARATIVE EVALUATIONS
CORRECTIONS
DISTRIBUTION
ELECTROMAGNETIC FIELDS
ENERGY-LEVEL TRANSITIONS
ETA MESONS
ETA PRIME-958 MESONS
FORM FACTORS
GLUON-GLUON INTERACTIONS
GLUONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PERTURBATION THEORY
PHOTONS
QUANTUM CHROMODYNAMICS
QUARK-GLUON INTERACTIONS
QUARKS