Examination of non-B bar B decays of the Υ(4S) in hybrid models

The large rate for the Zweig-rule-suppressed decay Υ(4S)→ψ+X with a high momentum ψ is discussed and models are considered in which b bar b annihilation occurs in a color-octet state. Our main findings are the following. (1) The central value of the observed CLEO rate is difficult to account for in all such models. (2) Among these models, only those in which the b bar b (octet) is in a total spin-0 state seem to be the least inconsistent with the observed rate. (3) The spin-0 state yields a hard photon with a relatively high branching ratio which is on the verge of being ruled out by a CUSB measurement. The implications of these models for ηc, D bar D, φ, and photonic final states are given. The possibility of distinguishing among the contributions of spin-1 and spin-0 color octets is also discussed