Revisiting γγ->π^+π^- at low energies

Details Revisiting γγ->π^+π^- at low energies Revisiting γγ->π^+π^- at low energies

2006-02-27

arxiv.org/abs/hep-ph/0602234v1

Nucl.Phys. B745 (2006) 84-108

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, 8 figures, 6 tables

Scientific paper

10.1016/j.nuclphysb.2006.03.022

We complete the recalculation of the available two-loop expressions for the reaction \gamma\gamma->\pi\pi in the framework of chiral perturbation theory. Here, we present the results for charged pions. The cross section and the values of the dipole polarizabilities agree very well with the earlier calculation, provided the same set of low-energy constants (LECs) is used. With updated values for the LECs at order p^4, we find for the dipole polarizabilities (\alpha_1-\beta_1)_{\pi^\pm} = (5.7\pm 1.0) 10^{-4} fm^3, which is in conflict with the experimental result recently reported by the MAMI Collaboration.

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