Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-01-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
This work is superseded by later papers, see Nucl. Phys. A 778 (2006) 95
Scientific paper
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.
Gashi A.
Matsinos Evangelos
Oades G. C.
Rasche Guenther
Woolcock W. S.
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