Study of hadronization using energy flow from e/sup +/e/sup -/ annihilation into quarks and gluons

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5146131

The author has made a high statistics study of QCD jets produced in e/sup +/e/sup -/ annihilations at ..sqrt..s of 29 GeV and observed in the MAC detector located at the PEP storage ring at SLAC. Fits of the jet transverse energy flow are made to the data using String (STR) model and several types of Independent Jet (IJM) model hypothesis, where ..cap alpha../sub s/, the strong coupling constant, and sigma/sub q/, the width of the secondary quark P/sub perpendicular/ distribution, are free parameters. The fits to O(..cap alpha../sub s/sup 2//) using MS renormalization yield ..cap alpha../sub s/ approx. 0.17 with the STR hypothesis, and ..cap alpha../sub s/ approx. 0.12 with the various IJM hypothesis. The correlations between ..cap alpha../sub s/ and sigma/sub 1/ are examined. Detailed comparisons were made with other experimental results. The energy flow projected onto the event plane of 3-jet events selected from the above data sample was studied. The data shows an asymmetric energy flow around the thin jet. Such an asymmetry was predicted by the STR model, and a cluster model (Webber) incorporating soft gluon interference. The various IJM models show no such asymmetry. The author associates this assymmetry with coherence effects during hadronization.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 5146131
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
COMPOSITE MODELS
COUPLING CONSTANTS
DATA
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
EXTENDED PARTICLE MODEL
GEV RANGE
GEV RANGE 10-100
GLUONS
HADRONS
INFORMATION
INTERACTIONS
JET MODEL
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MULTIPLE PRODUCTION
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PEP STORAGE RINGS
POSTULATED PARTICLES
QUARK MODEL
QUARKS
STORAGE RINGS
STRING MODELS
TRANSVERSE MOMENTUM