Summary
It is shown that the extrapolation used by Beneventanoet al. to obtain the negative to positive ratio at threshold is very sensitive to small alterations which can be made due to the approximate nature of the procedure. Such small alterations bring about very substantial changes in the energy dependence of the ratio near threshold and hence the extrapolation is quite ambiguous in the absence of extensive experimental data on the ratio in this energy region. Since such extensive set of data does not exist at the present time, it is concluded that there is no good reason to believe that the ratio at threshold is in disagreement with the theoretical predictions.
Riassunto
Si dimostra che l’estrapolazione usata da Beneventanoet al. per ottenere il rapporto negativo a positivo alla soglia è molto sensibile a piccole modificazioni rese possibili dalla approssimazione adottata nel procedimento. Tali piocole modificazioni portano con sè variazioni sostanziali nella dipendenza dall’energia del rapporto vicino alla soglia e pertanto 1’estrapolazione risulta ambigua in assenza di estesi dati sperimentali sul rapporto in questo intervallo di energia. Poichè queste estese serie di dati per il momento non esistono, si conclude che non esistono buone ragioni di ritenere che il rapporto alla soglia sia in disaccordo con le predizioni teoriche.
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References
M. Beneventano, G. Bernardini, D. Carlson-Lee, G. Stoppini andL. Tau:Nuovo Cimento,4, 323 (1956). This paper will be referred to as BBCST.
M. J. Moravcsik:Phys. Rev.,105, 267 (1957).
See e.g.H. P. Noyes:Phys. Rev.,101, 320 (1956).
M. J. Moravcsik:Phys. Rev.,104, 1451 (1956).
M. J. Moravcsik:Phys. Rev. 107, 600 (1957).
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Work carried out under the auspices of the U.S. Atomic Energy Commission.
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Moravcsik, M.J. On the threshold behavior of the negative to positive ratio in pion photoproduction. Nuovo Cim 7, 442–450 (1958). https://doi.org/10.1007/BF02747760
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DOI: https://doi.org/10.1007/BF02747760