The photon to pseudoscalar meson transition form factors

TL;DR

This paper analyzes photon to pseudoscalar meson transition form factors using a modified perturbative approach, highlighting unexpected BaBar data features like rapid form factor rise and flavor symmetry breaking.

Contribution

It introduces an analysis of transition form factors incorporating quark transverse degrees of freedom, addressing surprising experimental observations.

Findings

Sharp rise of the pi-gamma form factor with photon virtuality

Strong flavor symmetry breaking in pseudoscalar mesons

Insights into quark transverse degrees of freedom effects

Abstract

In this talk it is reported on an analysis of the form factors for the transitions from a photon to one of the pseudoscalar mesons pi0, eta, eta', etac within the modified perturbative approach in which quark transverse degrees of freedom are retained. The report is focused on the discussion of the surprising features the new BaBar data exhibit, namely the sharp rise of the pi-gamma form factor with the photon virtuality and the strong breaking of flavor symmetry in the sector of pseudoscalar mesons.