Four of the six parameters defining the two-loop pi-pi scattering amplitude have been determined using Roy dispersion relations. Combining this information with the Standard ChPT expressions, we obtain the threshold parameters, low-energy phases and the 0(p4) constants l_1, l_2. The result reproduces the correct D-waves but it is incompatible with existing Standard ChPT analyses of Kl4 form factors beyond one loop.
Comment on the prediction of two-loop standard chiral perturbation theory for low-energy pi-pi scattering
GIRLANDA, Luca;
1997-01-01
Abstract
Four of the six parameters defining the two-loop pi-pi scattering amplitude have been determined using Roy dispersion relations. Combining this information with the Standard ChPT expressions, we obtain the threshold parameters, low-energy phases and the 0(p4) constants l_1, l_2. The result reproduces the correct D-waves but it is incompatible with existing Standard ChPT analyses of Kl4 form factors beyond one loop.File in questo prodotto:
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