Spin analysis of 0+1→0+1 and its application to π+d→π+d data

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Abstract
The polarization structure of the reaction 0+1→0+1 is discussed in the optimal transversity frame. First, the relationship between the observables and the bilinear products of amplitudes (‘‘bicoms’’) is given when only Lorentz invariance is imposed. Then parity conservation and time-reversal invariance are also imposed, resulting in modified relationships. The measurements of spin correlations between initial- and final-state spins needed to determine the amplitudes completely are enumerated. The results are applied to the existing π-d data, and the consequences of any possible dibaryon resonances are examined.