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Title:Photoproduction of D(*,+/-) and D(0) mesons
Author(s):Jaross, Glen Richard
Doctoral Committee Chair(s):Wiss, J.E.
Department / Program:Physics, Elementary Particles and High Energy
Discipline:Physics, Elementary Particles and High Energy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Elementary Particles and High Energy
Abstract:The charmed mesons D$\sp\circ$ and D$\sp{\*\pm}$ have been observed in photon-nucleus collisions at the FNAL Wide Band Laboratory. A sample of 5500 inclusive D$\sp\circ$ events and 1400 $\rm D\sp{\*\pm} \to D\sp\circ\pi\sp\pm$ events were used to study charm production mechanisms and D$\sp\circ$ meson decay dynamics.
The cross section for producing D$\sp\circ$ and D$\sp{\*\pm}$ mesons has been measured in the K$\sp\pm\pi\sp\mp$ and K$\sp\pm\pi\sp-\pi\sp+\pi\sp\mp$ decay modes of the D$\sp\circ$ meson as a function of incident photon energy and Feynman x. The results agree reasonably well with previous measurements.
The mean lifetime of the D$\sp\circ$ meson has been measured as: $\tau\sb{D}$ = 0.431 $\pm$.010 $\pm$.023 picoseconds using a sample of 2913 $\pm$ 101 events. The decay $\rm D\sp{\*\pm}\to (K\sp+K\sp-)\pi\sp\pm$ has been observed at a level of 56 $\pm$ 14 events, and its branching ratio was calculated to be$${\Gamma(D\sp{\*\pm} \to (K\sp+K\sp-)\pi\sp\pm)\over \Gamma(D\sp{\*\pm} \to (K\sp+\pi\sp-)\pi)} = .118 \pm .032$$The decay D$\sp\circ\to\pi\sp+\pi\sp-\pi\sp+\pi\sp-$ was also observed. Its branching ratio$${\Gamma(D\sp\circ \to \pi\sp+\pi\sp-\pi\sp+\pi\sp-)\over \Gamma(D\sp\circ \to K\sp+\pi\sp-\pi\sp+\pi\sp-)} = .114 \pm .026$$was calculated on the basis of 235 $\pm$ 43 events.
Issue Date:1991
Rights Information:Copyright 1991 Jaross, Glen Richard
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9124434
OCLC Identifier:(UMI)AAI9124434

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