The inelastic diproton resonances; K-matrix analysis

Abstract

A K-matrix analysis of the ID,, 'F, and 'P,-'F2 partial waves based upon the recent phase-shift analysis by the present author is performed. The analysis provides strong evidence for the existence of the resonance pole in each of these partial waves (two pales in the 'F, wave). Location of the poles relative to the N A cut gives a strong indication that the diproton resonances arise as the unitary reflection of the 'bound' state in the 'S, wave, of the virtual state in the 'P2 wave and of the resonance in the ' P, wave of the NA system. Comparison of the phases of the NA-NA partial amplitudes following from our K-matrix analysis with those ablained in recent partial wave analysis of the pp+ N A reaction shows that the results of the latter cannot sene as a refutation of the existence of diproton resonances. The discrepancies between our results and the latest of the Blacksburg group analysis are discussed in some detail.

On the evaluation of the real parts of forward pp amplitudes from the data at small t

“…The parameters P, D", R and A at small t were measured by Besset et a1 [19] at the energies T=312, 392, 493 and 575 MeV. The normalisation errors of these data [9]. $The data at 4.67,5.23,5.26 and 11.12" are rejected in accordance with the recommendation of [29].…”