FAILURE OF S-CHANNEL HELICITY CONSERVATION IN A$sub 1$$sup -$ PRODUCTION.
Abstract
In the N* mass spectrum one observes enhancements at 1.49 GeV, 1.72 GeV, and 2.0 GeV. For the prominent 1.72 GeV feature estimates are given of the width and cross section as well as evidence favoring a substantial branching fraction to ..pi delta..(1230). We looked for production of N*(1470) followed by decay to ..pi delta..(1230) with negative result. An examination of the ..delta../sup + +/(1230) decay distribution suggests that the Deck mechanism is the major contributor to the ..pi delta.. subchannel. The s-channel and t-channel helicity conservation rules were tested. One observed violent conflict with sCHC and mild conflict with tCHC. One also tested for simultaneous validity of tCHC and the Gribov--Morrison rule and found no significant contradiction with this dual hypothesis.
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