Once and twice subtracted crossing symmetric dispersion relations applied to ππ→ππ scattering data are analyzed and compared. Both sets of dispersion relations can be used to test the ππ amplitudes in low partial waves up to about 1 GeV. We show how once subtracted dispersion relations can provide stronger constraints for ππ amplitudes than twice subtracted ones in the 400 to 1100 MeV range, given the same experimental input.
@article{arxiv.0905.2139,
title = {Once and twice subtracted dispersion relations in the analysis of pi pi amplitudes},
author = {R. Kaminski and R. Garcia-Martin and J. R. Pelaez and F. J. Yndurain},
journal= {arXiv preprint arXiv:0905.2139},
year = {2009}
}
Comments
6 pages, to appear in proceedings of ExcitedQCD 09 workshop, 8-14 February 2009, Zakopane (Poland)