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Pion-nucleon resonances and the angular distribution in pion electroproduction

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Il Nuovo Cimento A (1965-1970)

Summary

Using the helicity formalism, we find the contributions from final states of definite spin and parity, together with the interference terms between different final-state contributions, to the angular distributions of pions electro-produced from protons. For a single resonant final state the azimuthal terms turn out to be particularly simple, and may well serve as a test for the spin of the resonance. We show that the angular distribution may be used to detect the possible presence of ap 1/2 resonant state in the energy region of the second resonance.

Riassunto

Servendosi del formalismo dell'elicità, si trovano i contributi degli stati finali con spin e parità definiti, assieme ai termini di interferenza fra differenti contributi dello stato finale, alle distribuzioni angolari di pioni elettroprodotti da protoni. Risulta che per un singolo stato finale di risonanza i termini azimutali sono particolarmente semplici e possono servire bene per la verifica dello spin della risonanza. Si dimostra che la distribuzione angolare può essere usata per rivelare la possibile presenza di uno stato risonante conp 1/2 nell'intervallo di energia della seconda risonanza.

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Author notes

  1. H. F. Jones

    Present address: Physics Department, Imperial College, SW7, London

Authors and Affiliations

  1. Physics Department, Harvard University, Cambridge, Mass

    H. F. Jones

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  1. H. F. Jones
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Additional information

Traduzione a cura della Redazione.

This work was supported by the U.S. Atomic Energy Commission.

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Jones, H.F. Pion-nucleon resonances and the angular distribution in pion electroproduction. Nuovo Cimento A (1965-1970) 40, 1018–1033 (1965). https://doi.org/10.1007/BF02824662

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  • DOI: https://doi.org/10.1007/BF02824662

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