Effects of S - Wave Thresholds
نویسنده
چکیده
The opening of a new S-wave threshold is frequently accompanied by an abrupt dip in the magnitude of an amplitude for an already-open channel. One familiar example is the behavior of the I = 0 S-wave ππ scattering amplitude atKK̄ threshold. Numerous other examples of this phenomenon in recent data are noted, and a unified description of the underlying dynamics is sought. PACS numbers: 11.55.-m, 11.80.-m, 11.80.Gw, 13.75.-n
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