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Title:Comparison of pion- and proton- production of charmonium
Author(s):Graff, Thomas Leo
Doctoral Committee Chair(s):Koester, L.J.
Department / Program:Physics
Discipline:Physics
Degree:Ph.D.
Genre:Dissertation
Subject(s):pion production
proton production
charmonium
charmonium X states
proton-beryllium interactions
Abstract: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.
Issue Date:1984
Genre:Dissertation / Thesis
Type:Text
Language:English
URI:http://hdl.handle.net/2142/25319
Rights Information:1984 Thomas Leo Graff
Date Available in IDEALS:2011-06-07
Identifier in Online Catalog:4786502


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