Comment on the prediction of two-loop standard chiral perturbation theory for low-energy (pi)(pi) scattering

摘要

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 (sub (chi))PT expressions, the threshold parameters, low-energy phases and the O(p(sup 4)) constants l(sub 1)(sup r), l(sub 2)(sup r) are obtained. The result reproduces the correct D-waves but it is incompatible with existing Standard (sub (chi))PT analyses of K(sub 14) form factors beyond one loop. (author). 32 refs. (Atomindex citation 29:006422)