ar X iv : h ep - p h / 94 10 30 4 v 2 1 8 O ct 1 99 4 WU B 94 - 28 MESON - PHOTON TRANSITION FORM FACTORS
نویسندگان
چکیده
We report results on the π-γ transition form factor obtained within the hard scattering approach including transverse momentum effects and Sudakov corrections. The results clearly favor distribution amplitudes close to the asymp-totic form, ∼ x 1 x 2 , and disfavor distribution amplitudes which are strongly concentrated in the end-point regions. This observation is backed by information on the elastic form factor of the pion and on its valence quark distribution function. Applications of our approach to the η-γ and η ′-γ transition form factors are discussed as well. Combining the form factor data with the two-photon decay widths, we determine the η and the η ′ decay constants and the η-η ′ mixing angle.
منابع مشابه
ar X iv : h ep - p h / 94 10 21 2 v 1 4 O ct 1 99 4 LATTICE GAUGE THEORY : STATUS REPORT 1994 *
We report on recent developments and results from Lattice Gauge Theory. These include determinations of the strong coupling constant αs and the b-quark mass Mb and an update on the Kaon B parameter BK . Lattice results for heavy meson decay constants and semileptonic B and D meson decay form factors are reviewed. The first attempts to study the Isgur-Wise function and the radiative Penguin deca...
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