Abstract
Using data collected with the CLEO-III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons and mesons ( and ) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in compared with nearby continuum () indicating greater () per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the and resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process with that in events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the “enhancement” ratio, defined as the ratio of particle yields per gluon-fragmentation event compared to quark-fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in gluon and quark fragmentation. In the photon-tagged analysis ( compared to ), we find almost no enhancement for protons (), but a significant enhancement () for ’s. This small measured proton enhancement rate is supported by a study of baryon production in relative to . Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the . Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.
4 More- Received 19 April 2007
DOI:https://doi.org/10.1103/PhysRevD.76.012005
©2007 American Physical Society