… II and, in the following sections, we investigate to which extent the ensuing scattering
amplitudes are consistent, in particular, with high energy information. To do so, we assume Regge …

… The results of the present article show that, if we improve the scattering amplitudes above
1 GeV using more reliable data sets that those we had in PY05, the ensuing amplitudes verify …

… Above this energy we assume the scattering amplitudes to be given by Regge formulas,
that we discuss in Sec. III below. The reason why we choose to use Regge theory above 1.42 …

… amplitudes of the, E —+ 3~ decay. The kernels in these equations depend on the pion-pion
S-wave scattering amplitudes. … decay are related to pion-pion S-wave scattering. The latter in …

… We present technical details of the evaluation of the elastic TV scattering amplitude to
two loops in chiral perturbation theory. In particular, we elaborate on the renormalization …

… imaginary parts in terms of the real parts of the scattering amplitudes. The utility of this
expansion derives from the assumed smallness of the ππ scattering lengths. In the case of K+ → π…

… The constraints we shall test restrict the shape of the pion-pion amplitudes in a … PION-PION
SCATTERING We first recall the basis of the rigorous properties of the pion-pion amplitudes …

… Pion-pion scattering is very special due to the strong … the amplitude even at energies where
data are poor. Our aim is to provide reliable and model-independent scattering amplitudes …

… scattering, it is found that the unknown quantity in the dispersion relation is only a pion-pion
scattering amplitude… I, namely we expand the pion-pion scattering amplitude in partial waves …

… scattering of/-spin eigen states as for the scattering of identical particles. Scattering amplitudes
for physical charge states are related to the above isospin amplitudes by the relations F(+…