Charm production by muons and its role in scale noninvariance

Journal Article · Sat Aug 01 00:00:00 EDT 1981 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.24.559· OSTI ID:6189297

Gollin, G D; Shoemaker, F C; Surko, P; Clark, A R; Johnson, K J; Kerth, L T; Loken, S C; Markiewicz, T W; Meyers, P D; Smith, W H; Strovink, M; Wenzel, W A; Johnson, R P; Moore, C; Mugge, M; Shafer, R E

Interactions of 209-GeV muons in the multimuon spectrometer at Fermilab have yielded more than 8 x 10/sup 4/ events with two muons in the final state. After reconstruction and cuts, the data contain 20 072 events with (81 +- 10)% attributed to the diffractive production of charmed states decaying to muons. The cross section for diffractive charm muoproduction is 6.9/sup +1.9//sub -1.4/ nb where the error includes systematic uncertainties. Extrapolated to Q/sup 2/ = 0 with sigma(Q/sup 2/) = sigma(0)(1+Q/sup 2//..lambda../sup 2/)/sup -2/, the effective cross section for 178- (100-) GeV photons is 750/sup +180//sub -/130 (560/sup +//sub -//sup 2//sub 1//sup 0//sub 2//sup 0//sub 0/) nb and the parameter ..lambda.. is 3.3 +- 0.2 (2.9 +- 0.2) GeV/c. The ..nu.. dependence of the cross section is similar to that of the photon-gluon-fusion model. Okubo-Zweig-Iizuka selection rules and unitarity allow the muon data to set a 90%-confidence lower limit on the psiN total cross section of 0.9 mb. A first determination of the structure function F/sub 2/(cc-bar) for diffractive charm production indicates that charm accounts for approximately 1/3 of the scale noninvariance observed in inclusive muon-nucleon scattering at low Bjorken x.

• Research Organization: Joseph Henry Laboratories, Princeton University, Princeton, New Jeresy 08544
• OSTI ID: 6189297
• Journal Information: Phys. Rev. D; (United States), Vol. 24:3
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARM PARTICLES
PAIR PRODUCTION
MUON-NUCLEON INTERACTIONS
INCLUSIVE INTERACTIONS
DIFFRACTION MODELS
FEYNMAN DIAGRAM
GEV RANGE 100-1000
MULTIPLE PRODUCTION
MUONS
PARTON MODEL
QUANTUM CHROMODYNAMICS
SELECTION RULES
STRUCTURE FUNCTIONS
TOTAL CROSS SECTIONS
COMPOSITE MODELS
CROSS SECTIONS
DIAGRAMS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
FUNCTIONS
GEV RANGE
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
QUANTUM FIELD THEORY
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties