Evidence for the flavor singlet axial anomaly related effects in $φ$ meson electromagnetic production at large momentum transfers

Details Evidence for the flavor singlet axial anomaly related effects in $φ$ meson electromagnetic production at large momentum transfers Evidence for the flavor singlet axial anomaly related effects in $φ$ meson electromagnetic production at large momentum transfers

2001-04-06

arxiv.org/abs/hep-ph/0104070v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 6 figures, Latex; final version to appear in Phys. Lett.B

Scientific paper

10.1016/S0370-2693(01)00894-2

The gluonic contributions to the conventional PCAC formulas due to flavor singlet axial anomaly have been instrumental in explaining the mass of the $\eta^{\prime}$ and providing a plausible explanation for solving the spin crisis. We show that they also play an important role in the description of photo- and electroproduction of vector mesons at low energy and high momentum transfers. We calculate the contributions of this type to $\phi$ meson electromagnetic production in a model, which contains also a soft pomeron, and find agreement with recent CLAS data.

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