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ANALYSE EN DEPHASAGES DE LA DIFFUSION ELASTIQUE PION-NUCLEON DU SEUIL A L'ENERGIE DE 2,5 GeV ayed

Authors
  • Ayed, Rachid
Publication Date
Oct 01, 1976
Source
INSPIRE-HEP
Keywords
License
Unknown
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Abstract

An energy-independent phase-shift analysis of pion-nucleon elastic scattering is performed from threshold to 2.5 GeV/c2 masses. It uses a coherent set of data (cross sections and polarizations for the 3 final states: π+p, π-p and π0n) constructed from a considerable number (approximately 30000) of experimental points. Empirical criteria of smoothness behavior with energy of the partial waves allowed to obtain a unique solution, i.e. one set of phases shifts (up to I waves) at each energy. The consistency of the solution has been checked by a dispersion relation on the B invariant amplitude. The partial amplitudes obtained have been fitted separately, as a function of energy, in order to extract resonance from background. New resonances of small elasticity have been identified. Parameters (mass, width and elasticity) of all resonant states are given. A dynamical interpretation of the resonance is discussed and their recurrence in the Chew-Frautschi plot are shown

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