2026-09-22T13:36:59Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/23521 2023-07-10 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

(UMI)AAI9124434 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:02Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:31:07-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only Wiss, J.E. Jaross, Glen Richard 2011-05-07T14:17:17Z 2011-05-07T14:17:17Z 10000-01-01 1991 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. Made available in DSpace on 2011-05-07T14:17:17Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124434.pdf: 8404127 bytes, checksum: 2376c5e204f19a12cb936d0c0c74e02b (MD5) Previous issue date: 1991 AAI9124434 http://hdl.handle.net/2142/23521 eng Copyright 1991 Jaross, Glen Richard Physics, Elementary Particles and High Energy Photoproduction of D(*,+/-) and D(0) mesons text Physics, Elementary Particles and High Energy Physics, Elementary Particles and High Energy University of Illinois at Urbana-Champaign Dissertation Ph.D.