I. I. Strakovsky

Extended partial-wave analysis of piN scattering data

We present results from a comprehensive partial-wave analysis of {pi}{sup {+-}}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 {pi}{sup -}p{yields}{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 {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.

Updated analysis of pi N elastic scattering data to 2.1-GeV: The Baryon spectrum

We present the results of energy-dependent and single-energy partial-wave analyses of {pi}{ital N} elastic scattering data with laboratory kinetic energies below 2.1 GeV. Resonance structures have been extracted using Breit-Wigner fits, speed plots, and a complex plane mapping of the associated poles and zeros. This is the first set of resonance parameters from a VPI analysis constrained by fixed-{ital t} dispersion relations. We have searched our solutions for structures which may have been missed in our previous analyses, finding candidates in the {ital S}{sub 11} and {ital F}{sub 15} partial-wave amplitudes. Our results are compared with those found by the Karlsruhe, Carnegie-Mellon--Berkeley, and Kent State groups.

Analysis of pion photoproduction data

A partial-wave analysis of single-pion photoproduction data has been completed. This study extends from threshold to 2 GeV in the laboratory photon energy, focusing mainly on the influence of new measurements and model-dependence in the choice of parameterization employed above the two-pion threshold. Results are used to evaluate sum rules and estimate resonance photo-decay amplitudes. These are compared to values obtained in the MAID analysis.

Updated resonance photodecay amplitudes to 2 GeV.

We present the results of an energy-dependent and set of single-energy partial-wave analyses of single-pion photoproduction data. These analyses extend from threshold to 2 GeV in the laboratory photon energy, and update our previous analyses to 1.8 GeV. Photo-decay amplitudes are extracted for the baryon resonances within this energy range. We consider two photoproduction sum rules and the contributions of two additional resonance

Nucleon-nucleon elastic scattering to 3 GeV

A partial-wave analysis (PWA) of NN elastic scattering data has been completed. This analysis covers an expanded energy range, from threshold to a laboratory kinetic energy of 3 GeV, in order to include recent elastic pp polarized scattering measurements performed at SATURNE II. Results of the energy-dependent fit are compared with single-energy solutions and Saclay amplitudes obtained via the direct-reconstruction approach. We also comment on the status of {epsilon}{sub 1} in the low-energy region. (c) 2000 The American Physical Society.

Updated analysis of NN elastic scattering to 3-GeV

A partial-wave analysis of

Nonstrange and other flavor partners of the exoticΘ+baryon

NN

Updated analysis of NN elastic scattering data to 1.6 GeV.

elastic scattering data has been updated to include a number of recent measurements. Experiments carried out at the Cooler Synchrotron (COSY) by the EDDA Collaboration have had a significant impact above 1 GeV. Results are discussed in terms of the partial-wave and direct-reconstruction amplitudes.

Nucleon-nucleon elastic scattering analysis to 2.5 GeV

Given presently known empirical information about the exotic

Unified Chew-Mandelstam SAID analysis of pion photoproduction data

{\ensuremath{\Theta}}^{+}