Phase-shift analysis of low-energy pi+ p data
Abstract
This work presents the results of a revised analysis of the low-energy (pion laboratory kinetic energy T(sub pi) < 100 MeV) pi+ p data using recently obtained electromagnetic corrections. The measurements are analyzed assuming extended threshold expansions for the hadronic K-matrix elements. With a few exceptions, the description of the experimental data is satisfactory. Several minimization functions have been used, yielding consistent results. The phase-shift values, obtained in the s and p(3/2) partial waves, disagree with those of the most recent VPI global-fit solution (SP98); the largest part of this disagreement is removed if we compare our numbers to their single-energy solutions. The s-wave scattering length a(sub 0+), the p-wave scattering volumes a(sub 1+) and a(sub 1-), as well as the hadronic phase shifts themselves, obtained herein, are in agreement with recent work using older electromagnetic corrections; the output of the present work (including meaningful uncertainties) is tabulated in order to enable straightforward use in other applications.
Cite
@article{arxiv.hep-ph/9902207,
title = {Phase-shift analysis of low-energy pi+ p data},
author = {A. Gashi and E. Matsinos and G. C. Oades and G. Rasche and W. S. Woolcock},
journal= {arXiv preprint arXiv:hep-ph/9902207},
year = {2007}
}
Comments
This work is superseded by later papers, see Nucl. Phys. A 778 (2006) 95