Properties of heavy quark jets produced by e/sup +/e/sup -/ annihilation at 29 GeV

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5320686

Rowson, P C

The Mark II detector in the e/sup +/e/sup -/ storage ring PEP at the Stanford Linear Accelerator Center (SLAC) is used to measure selected properties of hadronic events corresponding to produced bottom or charm quarks. Heavy flavor enrichment is accomplished by tagging events with prompt electrons or muons. Differences between bottom, charm and average jets are observed for momentum, transverse momentum, rapidity and jet mass distributions. A detailed study of the charged multiplicity of b- and c-enriched events finds the mean multiplicity of bottom and charm events to be 16.2 +/- 0.5 +/- 1.0 and 13.2 +/- 0.5 +/- 0.9 respectively, where the first error is statistical and the second is systematic. The corresponding non-leading multiplicities of charged particles accompanying the pair of heavy hadrons are 5.2 +/- 0.5 +/- 0.9 or bottom, and 8.0 +/- 0.5 +/- 0.9 for charm. The author finds from these nonleading multiplicities that bottom and charm hadrons fragment with mean energy fractions of /sub b/ = 0.79/sub -0.05//sup +0.10/ and /sub c/ = 0.60/sub -0.11//sup +0.99/. These results confirm the expected hard fragmentation of heavy quarks and agree with previous measurements based on leptonic inclusive spectra and D/sup */ fragmentation.

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 5320686
• 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
ANNIHILATION
BASIC INTERACTIONS
BEAUTY PARTICLES
CHARGED PARTICLES
CHARM PARTICLES
CROSS SECTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
GEV RANGE
GEV RANGE 10-100
HADRONS
INFORMATION
INTERACTIONS
JET MODEL
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MASS SPECTRA
MATHEMATICAL MODELS
MULTIPLE PRODUCTION
MULTIPLICITY
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PEP STORAGE RINGS
SPECTRA
STORAGE RINGS
TRANSVERSE MOMENTUM