2026-09-22T10:40:34Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/22505 2023-07-10 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

U of I Only Wiss, J.E. Lingel, Karen Lynette 2011-05-07T13:41:59Z 2011-05-07T13:41:59Z 10000-01-01 1990 $D\sp{\pm}$ mesons have been observed in photoproduction in Fermilab experiment E687. A sample of approximately 2500 events of the decay $D\sp{\pm}\ \to\ K\sp{\pm}\pi\sp{\pm}\pi\sp{\pm}$ has been analyzed. The cross section for $x\sb{f}\ >$ 0 is measured to be BR $\cdot$ $\sigma$ = 0.368 $\pm$ 0.073 $\pm$ 0.111 $\mu$b/Be nucleus at our average photon energy of 220 GeV. The cross section dependence on incident photon energy, Feynman x, and transverse momentum has also been measured and found to be in good agreement with other measurements. The lifetime of the $D\sp{\pm}$ has been measured to be 1.061 $\pm$ 0.039 $\pm$ 0.020 picoseconds. This measurement is also in good agreement with recent results. Made available in DSpace on 2011-05-07T13:41:59Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114321.pdf: 3631174 bytes, checksum: 32ac4d0c45d972a2c0c509b6e711ba34 (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:04Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:27:17-05:00 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 AAI9114321 (UMI)AAI9114321 http://hdl.handle.net/2142/22505 eng Copyright 1990 Lingel, Karen Lynette Physics, Elementary Particles and High Energy Photoproduction of D(+,-) mesons text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.