Muoproduction of J/psi(3100)

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5912620

Markiewicz, T W

Interactions of 209-GeV muons within an instrumented magnetized-steel calorimeter have produced 4374 +- 87 ..mu../sup +/..mu../sup -/ pairs from J/psi decay, corresponding to the cross section sigma(..mu..N ..-->.. ..mu.. psi X) = 0.64 +- 0.10 nb. These interactions are classified as either elastic (sigma = 0.36 +- 0.07 nb) or inelastic (sigma = 0.28 +- 0.06 nb) based primarily on the calorimetric determination of E/sub x/. The cross section for elastic psi production by virtual photons, sigma/sub eff/(..gamma../sub V/N) rises with energy nu as log nu. Its dependence on Q/sup 2/ fits the vector-meson dominance form P(lambda) = (1 + Q/sup 2//lambda/sup 2/)/sup -2/, with lambda = (2.0 - 2.4) +- 0.15 GeV, where the spread in values arises from considering the possibility of a Q/sup 2/ dependence in the decay angular distribution W(THETA, phi) and in the nuclear shadowing factor. We find that W(THETA, phi) is consistent with the form expected if the reaction ..gamma../sub V/N ..-->.. psi N conserves helicity in the s channel through natural-parity exchange in the t channel. After correction for nuclear effects, d sigma/sub eff//dt is described by the sum of two exponential terms in t, with average t slope b = 2.56/sup +0.35/sub -0.32/(stat.)/sup +0.21//sub -0.17/(syst.).

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 5912620
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALLOYS
ANGULAR DISTRIBUTION
BOSONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
HADRONS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LEPTON REACTIONS
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
MUON PAIRS
MUON REACTIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PSI RESONANCES
PSI-3105 RESONANCES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
RESONANCE PARTICLES
STEELS
VECTOR DOMINANCE MODEL
VECTOR MESONS