Comparison of Pion- and Proton-Production of Charmonium
Graff, Thomas Leo
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https://hdl.handle.net/2142/77372
Description
Title
Comparison of Pion- and Proton-Production of Charmonium
Author(s)
Graff, Thomas Leo
Issue Date
1984
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Elementary Particles and High Energy
Language
eng
Abstract
Charmonium (chi) 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/(PSI)+(gamma). This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/(PSI)'s resulting from (chi) decay is measured to be 0.33 (+OR-) 0.07 for incident pions and 0.47 (+OR-) 0.21 for incident protons. The (chi)(3510) and (chi)(3555) are produced in roughly equal numbers for pions, but the (chi)(3555) dominates for protons. Simple gluon fusion accounts for (chi) production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain (chi) production by pions.
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