Limit on the pion distribution amplitude
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Data
2015-01-01
Autores
Luna, E. G. S.
Natale, A. A. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Iop Publishing Ltd
Resumo
The pion distribution amplitude (DA) can be related to the fundamental QCD Green's functions as a function of the quark self- energy and the quark-pion vertex, which in turn are associated with the pion wave function through the Bethe-Salpeter equation. Considering the extreme hard asymptotic behavior in momentum space allowed for a pseudoscalar wave function, which is limited by its normalization condition, we compute the pion DA and its second moment. From the resulting amplitude, representing the field theoretical upper limit on the DA behavior, we calculate the photon-pion transition form factor F-pi gamma gamma*(Q(2)). The resulting upper limit on the pion transition form factor is compared with existing data published by CLEO, BaBar and Belle Collaborations.
Descrição
Palavras-chave
Non-perturbative QCD, Pion distribution amplitude, Hadron physics
Como citar
Journal Of Physics G-nuclear And Particle Physics. Bristol: Iop Publishing Ltd, v. 42, n. 1, p. 1-11, 2015.