private communication. 9 A previous publication, L. Criegee et^aL, Phys. Rev. Letters _T7, 150 (1966), quoted observations of 7±7 events. 10 The maximum correction from interference would scale the deduced branching ratio by 1.30 for constructive interference and by 0.71 for destructive interference.

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stant or increasing polarization with suitable but unnatural conspiracy of the positions and residues. 3 R» K. Logan and L. Sertorio, Phys. Rev. Letters 1/7, 834 (1966); R. J. N. Phillips, Nuovo Cimento 45., 245 (1966). Direct-channel resonances could be included in our model, which would enhance the polarization in the low-energy region. ). The position of the cut arising from the exchange of two poles with trajectories a fo) and a 2 {t) is given by the maximum of a^if) +a 2 (t")-l, where for t ^ 0, V and t" are constrained by t, r^O and (-t') y2 + (~t") yi^( -t) in . For straightline trajectories, the maximum is given by (2). Using Eq.(2), we see that oi c ' (t) = ap 'cip'/{ap +OL p '), and the cut trajectory will cross 1 at t = (1 + oip'/ ap')mp 2 . Thus, some anomaly in the 7r7r (J= 1) scattering amplitude may appear at this energy.