Power correctionsto the space-like transition form factor ${{F_{\eta^{\prime}g^{*}g^{*}}(Q^2,\omega )}}$
نویسندگان
چکیده
منابع مشابه
ηcγ TRANSITION FORM FACTOR
The ηcγ transition form factor is calculated in a model based on a modified hard scattering approach to exclusive reactions, in which transverse degrees of freedom are taken into account. For the ηc-meson a distribution amplitude of the Bauer-Stech-Wirbel type is used, where the two free parameters, namely the decay constant fηc and the transverse size of the wave function, are related to the F...
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The pion wave function is discussed in the light of the recent CLEO data on the πγ transition form factor. It turns out that the wave function is close to the asymptotic form whereas wave functions strongly concentrated in the end-point regions are disfavoured. Consequences for other exclusive quantities, as for instance the pion’s electromagnetic form factor, are also discussed. kroll@theorie....
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ژورنال
عنوان ژورنال: The European Physical Journal C - Particles and Fields
سال: 2004
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s2003-01463-2