Inclusive chibJ(nP) Decays to D0 X
Abstract
Using Upsilon(2S) and Upsilon(3S) data collected with the CLEO III detector we have searched for decays of chibJ to final states with open charm. We fully reconstruct D0 mesons with pD0 > 2.5 GeV/c in three decay modes (K-pi+, K-pi+pi0, and K-pi-pi+pi+) in coincidence with radiative transition photons that tag the production of one of the chibJ(nP) states. We obtain significant signals for the two J=1 states. Recent NRQCD calculations of chibJ(nP) --> c cbar X depend on one non-perturbative parameter per chibJ triplet. The extrapolation from the observed D0 X rate over a limited momentum range to a full c cbar X rate also depends on these same parameters. Using our data to fit for these parameters, we extract results which agree well with NRQCD predictions, confirming the expectation that charm production is largest for the J=1 states. In particular, for J=1, our results are consistent with c cbar g accounting for about one-quarter of all hadronic decays.