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Koester, L.J. Graff, Thomas Leo 2011-06-07T15:28:19Z 2011-06-07T15:28:19Z 10000-01-01 1984 "Charmonium X states produced in pi--beryllium interactions at 190 Gev/c and in proton-beryllium interactions at 200 Gev/c and 250 Gev/c have been observed via their decay into J/'+y. This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/""s resulting from X decay is measured to be 0.33±O.07 for incident pions and 0.47±0.2l for incident protons. The X(35l0) and X(3555) are produced in roughly equal numbers for pions, but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions." Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5) Made available in DSpace on 2011-06-07T15:28:19Z (GMT). No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5) Previous issue date: 1984 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 4786502 http://hdl.handle.net/2142/25319 en 1984 Thomas Leo Graff pion production proton production charmonium charmonium X states proton-beryllium interactions Comparison of pion- and proton- production of charmonium Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.