28 citations · 28 across the 1 of their papers we have counts for
6 papers
The anomalous process gamma pi -> pi pi to two loops
Torben Hannah
The amplitude for the anomalous process gamma pi -> pi pi is evaluated to two loops in the chiral expansion by means of a dispersive method. The two new coupling constants that ent…
Pion Scalar Form Factor and the Sigma Meson
Torben Hannah
From recent analysis of the scattering amplitude, it has been claimed that there exists a broad and light meson. However, if this meson really exists, it must also appear…
Hadron Polarizabilities and Form Factors
D. Drechsel, J. Becker, A. Z. Dubnickova +17
This is the summary of the working group on Hadron Polarizabilities and Form Factors of the Chiral Dynamics Workshop in Mainz, September 1-5, 1997.
Inverse Amplitude Method and Chiral Zeros
Torben Hannah
The inverse amplitude method has previously been successfully applied to scattering in order to extend the range of applicability of chiral perturbation theory. However, in or…
The Inverse Amplitude Method and Chiral Perturbation Theory to two Loops
Torben Hannah
The inverse amplitude method is analysed to two-loop order in the chiral expansion in the case of scattering and the pion form factors. The analysis is mainly restricted to th…
Unitarity, Chiral Perturbation Theory, and Meson Form Factors
Torben Hannah
The inverse-amplitude method is applied to the one-loop chiral expansion of the pion, kaon, and form factors. Since these form factors are determined by the same chiral lo…