Particles as S-matrix poles: hadron democracy

摘要

The idea of hadron democracy – that all hadrons are "composites" and nonfundamental – is not the same as the idea that all physically observ-able particles correspond to singularities of an analytic scattering matrix. Nevertheless, the histories of those two ideas, both of which belong to the decade under study at this symposium, are intertwined. I give here a personal recollection of the connection. I am indebted to James Cushing for allowing me a look at a preliminary version of his case study of the S-matrix program. I am forbidden from quoting Cushing and take full responsibility for what I shall say here, but his efforts have been helpful in compensating my poor memory.