Once subtracted Roy-like dispersion relations and a precise analysis of $ππ$ scattering data

Abstract

We report our progress on the data analysis of $ππ$ scattering data in terms of Forward Dispersion Relations (FDR), as well as Roy equations (RE) and their once-subtracted counterpart, GKPY equations. The first part of the analysis consists of independent fits to the different $ππ$ channels. The GKPY equations provide a more stringent consistency check for the parametrizations of the S0-wave data in the region from 400 to 1100 MeV, In the second part we present our preliminary analysis where the fits are constrained to satisfy all dispersion relations within errors, including the new GKPY Eqs., thus providing a very precise and model independent description of data using just analyticity, causality and crossing.

6 pages, 4 figures, to appear in the proceedings of the International Workshop On Effective Field Theories: From The Pion To The Upsilon (EFT 09), 2-6 Feb 2009, Valencia, Spain