{eta}{gamma} and {eta}

Journal Article · Sun Jul 01 04:00:00 EDT 2001 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.64.014007· OSTI ID:40204427

Agaev, Shahin S

The electromagnetic transition form factors F{sub {eta}({eta}{prime}){gamma}}(Q{sup 2}) of the {eta} and {eta}{prime} mesons are calculated within the standard hard scattering approach and the usual {eta}-{eta}{prime} mixing scheme using the running coupling constant method. Power suppressed corrections {similar_to}1/Q{sup p}, p=2,4,{hor_ellipsis} to Q{sup 2}F{sub M{gamma}}(Q{sup 2}), are evaluated. On the basis of this analysis deviations of the {eta}{sub 1} and {eta}{sub 8} meson distribution amplitudes (DA{close_quote}s) from the asymptotic form are discussed and model DA{close_quote}s are proposed. In computations as input parameters the phenomenological values of the octet-singlet mixing angle {theta}={minus}15.4{degree} and of the decay constants f{sub 1}{approx_equal}0.108GeV, f{sub 8}{approx_equal}0.116 GeV are used. A comparison is made with the experimental data and agreement in a range of the virtuality of the probing photon {gamma}{sup *}, 1.5GeV{sup 2}{le}Q{sup 2}{le}15GeV{sup 2}, is found.

• Sponsoring Organization: (US)
• OSTI ID: 40204427
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 1 Vol. 64; ISSN 0556-2821
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COUPLING CONSTANTS
DECAY
DISTRIBUTION
ENERGY-LEVEL TRANSITIONS
FORM FACTORS
MESONS
PHOTONS
SCATTERING