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- Title
The Photon-Pion Transition Form Factor: Incompatible Data or Incompatible Models?
- Authors
Melo, J.; El-Bennich, Bruno; Frederico, Tobias
- Abstract
The elastic and γ → π transition form factors of the pion along with its usual static observables are calculated within a light-front field approach to the constituent quark model. The focus of this exercise in a simple model is on a unified description of all observables with one singly parametrized light-front wave function to detect possible discrepancies in experimental data, in particular the contentious large momentum-squared data on the transition factor as reported by BaBar and Belle. We also discuss the relation of a small to vanishing pion charge radius with an almost constant pion distribution amplitude and compare our results with those obtained in a holographic light-front model.
- Subjects
PHOTONS; PIONS; PHASE transitions; ELASTICITY; QUARK models; WAVE functions
- Publication
Few-Body Systems, 2014, Vol 55, Issue 5-7, p373
- ISSN
0177-7963
- Publication type
Article
- DOI
10.1007/s00601-014-0853-z