Quantum-chromodynamic phenomenology of gluon jets

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.20.1101· OSTI ID:5877516

Shizuya, K; Tye, S H

We investigate in detail, within the framework of perturbative quantum chromodynamics, properties of the gluon jet in comparison with those of the quark jet. The short-distance features of a gluon jet are quite similar to those of a quark jet, apart from the difference in the overall color charges C/sub 2/(G)/C/sub 2/(R) = 9/4. The spread of a gluon jet in the transverse momentum is much bigger than that of a quark jet and the narrowing of a gluon jet with increasing energy is slower than that of a quark jet. We also evaluate the thrust T distribution which has the same features for both types of hadronic jets. The average <1 - T> and higher ''thrust moments'' < (1 - T)/sup n/> for the gluon-jet case are again approximately C/sub 2/(G)/C/sub 2/(R) = 9/4 times those for the quark-jet case. The usefulness of these thrust moments is emphasized. The implication of the above result on the search for gluon jets is discussed, especially in the hadronic decay of a heavy quarkonium state. We express the gluon-jet production cross section in terms of the Altarelli-Parisi parton functions. We emphasize that the spread of the gluon jet is a very clean place to measure the triple-gluon vertex coupling, since it provides the dominant contribution in the transverse-momentum spread.

• Research Organization: Fermi National Accelerator Laboratory, Batavia, Illinois 60510
• OSTI ID: 5877516
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 20:5; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions &amp; Properties-Theoretical-- Electromagnetic Interactions &amp; Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BAG MODEL
BASIC INTERACTIONS
BREMSSTRAHLUNG
COMPOSITE MODELS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
EXTENDED PARTICLE MODEL
FIELD THEORIES
GLUON MODEL
HADRONIC PARTICLE DECAY
INTERACTIONS
JET MODEL
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTON MODEL
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
RADIATIONS
RENORMALIZATION