Summary
An examination of the cross-sections for the reactions
near threshold was performed. The comparison of the results of this examination with experiment is presented, and it is shown that the negative to positive ratio is constant in the photon energy range (153÷193) MeV and equal to 1.4 (to an accuracy of 10%) in agreement with field theoretic results. The disagreement of these results with the values of the Panofsky ratio and the S-wave scattering phase shifts is discussed from the point of view of the two-component π0-mes.on field hypothesis. A direct experimental test of this hypothesis is proposed.
Riassunto
È stato fatto l’esame delle sezioni d’urto per le reazioni
in prossimità della soglia, Si presenta il confronto coll’esperienza dei risultati di tale esame e si dimostra che il rapporto negativo/positivo è oostante nel campo d’energia fotonica (153/193) MeV ed uguale a 1.4 (con l’approssimazione del 10%), d’accordo coi risultati della teoria dei campi. Il disaooordo dei precedenti risultati col rapporto di Panofsky e gli spostamenti di fase dello scattering delle onde S si discute dal punto di vista dell’ipotesi del campo dei mesoni π0. Si propone una prova sperimentale diretta per la verifica di questa ipotesi.
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References
J. M. Cassels:Proc. VII Ann. Rochester Conference (1957).
G. F. Chew:Proc. VII Ann. Rochester Conference (1957).
Cfr.G. F. Chew, M. L. Goldberger, F. E. Low andY. Nambu:Phys. Rev.,106, 1345 (1957).
M. Beneventano, G. Bernardini, D. Carlson-Lee, G. Stoppini andL. Tau:Nuovo Cimento,4, 323 (1956).
M. I. Adamovich, V. I. Veksler, G. V. Kusmicheva, V. G. Larionova andS. Charlamov:Proc. GERN Symposium (Geneva, 1956), and private communication.
G. F. Chew andN. W. Lewis:Phys. Rev.,84, 779 (1951).
A. M. Baldin:Thesis (Physical Institute of the USSR Academy of Sciences, 1953); CERNSymposium Proc.,2, 272 (1956).
A. Sommerfeld:Atombau, II (Braunschweig, 1956).
The detailed discussion of the experimental data will be published in theJourn. Exp. Theor. Phys. USSR.
A. Baldin andV. Mikchailov:Dokl. Akad. Nauk SSSR,91, 479 (1953).
A. Baldin:Suppl. Nuovo Cimento,3, 4 (1956).
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A part of this work was performed in the Physical Institute of the USSR Academy of Sciences and reported in thePadua-Venice Conference (September 1957). The other part of the work was performed in the Department of Mathematical Physics, University of Birmingham where the author is at present a visitor.
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Baldin, A. Photoproduction of π-mesons near threshold and the value of the Panofsky ratio. Nuovo Cim 8, 569–583 (1958). https://doi.org/10.1007/BF02828771
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DOI: https://doi.org/10.1007/BF02828771