Artículos de revistas
Limit on the pion distribution amplitude
Fecha
2015-01-01Registro en:
Journal Of Physics G-nuclear And Particle Physics. Bristol: Iop Publishing Ltd, v. 42, n. 1, p. 1-11, 2015.
0954-3899
10.1088/0954-3899/42/1/015003
WOS:000348130000004
WOS000348130000004.pdf
Autor
Universidade Federal do Rio Grande do Sul (UFRGS)
Universidade Federal do ABC (UFABC)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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.