Improvement of multichannel amplitudes for the pion-pion scattering using the dispersion relations
Abstract
The multichannel S- and P-wave amplitudes for the pion-pion scattering, constructed requiring analyticity and unitarity of the S-matrix and using the uniformization procedure, are elaborated using the dispersion relations with imposed crossing symmetry condition. The amplitudes are modified in the low-energy region to improve their consistency with experimental data and the dispersion relations. Agreement with data is achieved for both amplitudes from the threshold up to 1.8 GeV and with dispersion relations up to 1.1 GeV. Consequences of the applied modifications, e.g. changes of the S-wave lowest-pole positions, are presented.
Keywords
Cite
@article{arxiv.1211.2176,
title = {Improvement of multichannel amplitudes for the pion-pion scattering using the dispersion relations},
author = {Petr Bydzovsky and Robert Kaminski},
journal= {arXiv preprint arXiv:1211.2176},
year = {2013}
}
Comments
Presented at the 20th International IUPAP Conference on Few-Body Problems in Physics, 20 - 25 August, 2012, Fukuoka, Japan. Submitted to Few Body Systems