Quark and gluon decay functions in QCD and recombination model
Inclusive longitudinal-momentum distributions of pions in jets initiated by quarks and gluons are determined in perturbative QCD and recombination model. The quark and antiquark joint distributions in jets are first calculated in the leading-order approximation at high Q/sup 2/. Gluons in the jets are completely converted to quark pairs. From the overall distribution q anti q pairs with definite quantum numbers then recombine to form pions. The recombination function for the process is well determined in the valon model. No adjustable parameters are involved in these calculations, and no data at low Q/sup 2/ are used as phenomenological input. The result for the quark decay functions can be compared with data on e/sup +/e/sup -/ annihilation, and the agreement is very good in both shape and normalization. Predictions for the gluon decay functions are presented, but they cannot yet be checked by experiments. The x and Q/sup 2/ dependences of both types of decay functions have been parametrized in simple form suitable for use in theoretical and experimental applications. 17 figures, 1 table.
- Research Organization:
- Oregon Univ., Eugene (USA)
- DOE Contract Number:
- AT06-76ER70004
- OSTI ID:
- 6678227
- Report Number(s):
- DOE/ER/70004-266; RLO-2230-T4-266; TRN: 81-003491
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
JET MODEL
LONGITUDINAL MOMENTUM
DECAY
GLUONS
HARD COLLISION MODELS
INCLUSIVE INTERACTIONS
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
BOSONS
ELEMENTARY PARTICLES
FIELD THEORIES
HADRONS
INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
645204* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties
645400 - High Energy Physics- Field Theory