Summary
It is demonstrated that existing amplitude analyses of π±p scattering support the contribution to theI t=0 amplitudes of a σ trajectory in addition to the pomeron and f trajectories.
Riassunto
Si dimostra che le esistenti analisi dell’ampiezza dello scattering π±p appoggiano il contributo alle ampiezze conI t=0 di una traiettoria di σ oltre alle traiettorie della particella f e del pomerone.
Реэюме
Покаэывается, что сушествуюший аналиэ амплитуд π±p рассеяния подтверждает вклад σ траектории в амплитудыI t=0 в дополнение к вкладам траектории Померона и 1 траектории.
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The notation is that of ref. (13).F +− used here differs in sign from theF +− used in ref. (3,9), for example. The amplitudes satisfy dσ/dt=|F ++|2 + |F +−|2.
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This phase is consistent with recent dispersion relation studies of π±p elastic scattering which indicate that up to about 100 GeV/c the ratio of the real part to the imaginary part of the forward elastic amplitude is negative and small. See,R. E. Hendrick andB. Lautrup:Phys. Rev. D,11, 529 (1975).
σ n=1 of ref. (2) and σ+− of ref. (1) are defined opposite in sign to the σ+− used in the present note.
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Morrow, R.A. Amplitude analyses of π±p scattering and the σ trajectory. Nuov Cim A 43, 212–218 (1978). https://doi.org/10.1007/BF02734196
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DOI: https://doi.org/10.1007/BF02734196