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Título

Gluonic components of the pion and the transition form factor gamma*gamma* -> pi(0)

AutorVento, Vicente ; Kochelev, Nikolay
Palabras clavePion
Gluon component
Instanton
Form factor
Fecha de publicación5-feb-2010
EditorAmerican Physical Society
CitaciónPhysical Review - Section D - Particles and Fields 81 (3): 034009 (2010)
ResumenWe propose an effective Lagrangian for the coupling of the neutral pion with gluons whose strength is determined by a low-energy theorem. We calculate the contribution of the gluonic components arising from this interaction to the pion transition form factor gamma*gamma* -> pi(0) using the instanton liquid model to describe the quantum chromodynamics vacuum. We find that this contribution is large and might explain the anomalous behavior of the form factor at large virtuality of one of the photons, a feature which was recently discovered by the BABAR Collaboration.
Versión del editorhttp://dx.doi.org/ 10.1103/PhysRevD.81.034009
URIhttp://hdl.handle.net/10261/23089
DOI10.1103/PhysRevD.81.034009
ISSN1550-7998
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