University of Illinois Urbana-Champaign

Comparison of pion- and proton- production of charmonium

Graff, Thomas Leo

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https://hdl.handle.net/2142/25319

Description

Title
Comparison of pion- and proton- production of charmonium
Author(s)
Graff, Thomas Leo
Issue Date
1984
Doctoral Committee Chair(s)
Koester, L.J.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • pion production
  • proton production
  • charmonium
  • charmonium X states
  • proton-beryllium interactions
Language
en
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."
Type of Resource
text
Permalink
http://hdl.handle.net/2142/25319
Copyright and License Information
1984 Thomas Leo Graff

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Dissertations and Theses - Physics
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