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Extended partial-wave analysis of π N scattering data

2006; American Institute of Physics; Volume: 74; Issue: 4 Linguagem: Inglês

10.1103/physrevc.74.045205

1538-4497

R. A. Arndt, W. J. Briscoe, I. I. Strakovsky, R. L. Workman,

High-Energy Particle Collisions Research

We present results from a comprehensive partial-wave analysis of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ elastic scattering and charge-exchange data, covering the region from threshold to 2.6 GeV in the lab pion kinetic energy, employing a coupled-channel formalism to simultaneously fit ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}\ensuremath{\eta}n$ data to 0.8 GeV. Our main result, solution SP06, utilizes a complete set of forward and fixed-$t$ dispersion relation constraints applied to the $\ensuremath{\pi}N$ elastic amplitude. The results of these analyses are compared with previous solutions in terms of their resonance spectra and preferred values for couplings and low-energy parameters.