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| VOLUME 92 | ISSUE 10 |
PAGE 777
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ðï éôïçáí çòáîôï÷ òïóîáõëé ðï ðïääåòöëå îáõþîùè ûëïì îû-195.2008.2
Photon-pion transition form factor at high photon virtualities within the nonlocal chiral quark model
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A. E. Dorokhov
Joint Institute for Nuclear Research, Bogoliubov Laboratory of Theoretical Physics, 141980 Dubna, Moscow region, Russia
Institute for Theoretical Problems of Microphysics, Moscow State University, RU-119899 Moscow, Russia
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Abstract
Recently, the BABAR collaboration reported the measurments of the
photon-pion transition form factor  , which are in strong contradiction to the predictions of the
standard factorization approach to perturbative QCD.
In the present work, based on a nonperturbative approach to the QCD
vacuum and on rather universal assumptions, we show that there exists two
asymptotic regimes for the pion transition form factor. One regime with
asymptotics 
corresponds to the result of the standard QCD factorization approach, while
other violates the standard factorization and leads to asymptotic behavior as
 . Furthermore, considering specific nonlocal chiral quark models, we
find the region of parameters, where the existing CELLO, CLEO and BABAR data
for the pion transition form factor are successfully described.
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óÐÉÓÏË ÒÁÂÏÔ, ÃÉÔÉÒÕÀÝÉÈ ÄÁÎÎÕÀ ÓÔÁÔØÀ, ÓÍ. ÚÄÅÓØ.
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