Quark--parton model with large parton k/sub T/
The quark--parton model is generalized to allow for arbitrarily large parton k/sub T/. Since it is expected that < k/sub T/ > will rise with Q/sup 2/ in (highly virtual) photon mediated processes, this generalization is necessary to restore the applicability of the quark-parton model. By treating k/sub T/ as an essential kinematical variable, the introduction of a new scaling variable z is considered. Together with Bjorken's x variable, a unified kinematical description is given of the four distribution functions: hadron structure functions and jet decay functions for spacelike and timelike photons. The possibility of a simple interpolating universal function is considered. Phenomenological determination of that function is examined in detail. Predictions on R, parton < k/sub T/ >, hadron < p/sub T/> in jets, etc., are made with the dimuon < q/sub T/ > being used as an input. The usual relation = ..sqrt..2 < k/sub T > is shown to be false in the region where k/sub T/ is not small compared to k/sub L/, a situation which prevails in the production of dileptons recently measured. The k/sub T/ distributions for timelike and spacelike cases are shown to be not identical. The model is consistent with nearly all relevant data on virtual photon processes. 38 references
- Research Organization:
- Science Research Council, Chilton (UK). Rutherford Lab.; European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- DOE Contract Number:
- EY-76-S-06-2230-004
- OSTI ID:
- 6238915
- Report Number(s):
- DOE/ER/70004-211; RLO-2230/T4-211; TRN: 79-007329
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HADRONS
STRUCTURE FUNCTIONS
PARTON MODEL
TRANSVERSE MOMENTUM
QUARK MODEL
DECAY
DISTRIBUTION FUNCTIONS
JET MODEL
MATHEMATICAL SPACE
MUONS
PAIR PRODUCTION
PHOTONS
TIME DEPENDENCE
VIRTUAL PARTICLES
COMPOSITE MODELS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
INTERACTIONS
LEPTONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE MODELS
SPACE
645201* - High Energy Physics- Particle Interactions & Properties-Theoretical- General & Scattering Theory