Comparison of pion- and proton-production of charmonium

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5547543

Graff, T L

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 +/- 0.07 for incident pions and 0.47 +/- 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.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 5547543
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
645104 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALKALINE EARTH METALS
BARYON REACTIONS
BERYLLIUM
BOSONS
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
CHI RESONANCES
CHI-3500 RESONANCES
CHI-3550 RESONANCES
DATA
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
GLUONS
HADRON REACTIONS
HADRONS
INFORMATION
MESON REACTIONS
MESON RESONANCES
MESONS
METALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PION REACTIONS
POSTULATED PARTICLES
PROTON REACTIONS
PSI RESONANCES
PSI-3105 RESONANCES
RADIATIVE DECAY
RESONANCE PARTICLES
VECTOR MESONS