Presence and absence of scaling violations in inclusive leptoproduction
In the standard model, the heavy--quark-parton scaling variable is used to study the effects of the color-octet piece of the integrally-charged--quark-parton electromagnetic current which would violate scaling in deep-inelastic leptoproduction. With spin-1/2 partons it is found that sigma/sub L//sigma/sub T/ would deviate significantly from zero since (sigma/sub L//sigma/sub T/)/sub muN/ approx. = 4m/sub c//sup ts2/f/sub v/(z)/ 5Q/sup 2/f/sub v/(x), where f/sub v/(z) + u/sub v/(z) + d/sub v/(z), m/sub c//sup ts2/ = effective mass-squared of quark-parton in color-excited hadron, and z approx. = x + m/sub c//sup ts2//2MEy. Such scaling violations must occur in the ..mu.. data at currently available energies if the step of 2 units of R (beyond charm) in the 4-GeV region in the SPEAR data for ee-bar annihilation is due to a color threshold for the production of color-octet qq-bar mesons, qqq baryons, and/or quark-antiquark pairs. Consistency is shown between the scaling violations in the electroproduction data in the x < or = 0.2 region and the energy independence in the data of the CDHS collaboration for charged-current neutrino distributions for average y and for sigma/sup nu-bar/sigma/sup ..nu../. Exclusive final states responsible for electroproduction scaling violations in the x < or = 0.2 region would contain the tau-particle-antiparticle pairs (i.e., integrally charged quarks) and/or high-momentum photons (few GeV) from radiative decay modes of color-octet hadrons.
- Research Organization:
- Department of Physics, State University of New York at Binghamton, Binghamton, New York 13901
- OSTI ID:
- 6655362
- Journal Information:
- Phys. Rev., D; (United States), Vol. 18:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
ELECTROPRODUCTION
SCALING LAWS
PARTON MODEL
COLOR MODEL
DEEP INELASTIC SCATTERING
FLAVOR MODEL
INCLUSIVE INTERACTIONS
OCTET MODEL
BASIC INTERACTIONS
COMPOSITE MODELS
ELECTROMAGNETIC INTERACTIONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
QUARK MODEL
SCATTERING
645202* - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties
645400 - High Energy Physics- Field Theory