Journal
PHYSICAL REVIEW D
Volume 80, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.80.094009
Keywords
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Funding
- DOE [DE-AC05-06OR23177]
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A scenario is investigated in which the leading-twist pion distribution amplitude phi(pi)(x) is approximated by the pion decay constant f(pi) for all essential values of the light-cone fraction x. A model for the light-front wave function Psi(x,k(perpendicular to)) is proposed that produces such a distribution amplitude and has a rapidly decreasing (exponential for definiteness) dependence on the light-front energy combination k(perpendicular to)(2)/x(1-x). It is shown that this model easily reproduces the fit of recent large-Q(2) BABAR data on the photon-pion transition form factor. Some aspects of the scenario with flat pion distribution amplitude are discussed.
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