Inclusive lepton production in hadronic events from e/sup +/e/sup -/ annihilatio at 29 GeV

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5670334

Nelson, M E

The production rates of prompt electrons and muons in hadronic events from e/sup +/e/sup -/ annihilation at 29 GeV have been measured. The inclusive rate per hadronic event for leptons with total momenta greater than 2 GeV/c is determined to be (0.033 +/- 0.003 +/- 0.012) for electrons and (0.037 +/- 0.005 +/- 0.008) for muons. The longitudinal and transverse momentum spectra of these leptons are measured. The harder transverse momentum spectrum of leptons from bottom quark decays relative to charm decays allows us to separate the bottom and charm quark contributions to the prompt lepton signal. The longitudinal momentum distributions allow us to study the fragmentation properties of these heavy quarks. For charm quarks we find average semileptonic branching ratios of (6.4 +/- 1.3 +/- 2.8)% into electrons and (8.1 +/- 1.6 +/- 1.8)% into muons. For bottom quarks the average branching ratios of (12.9 +/- 2.5 +/- 2.0)% into electrons and (12.2 +/- 5.0 +/- 3.0)% into muons have been found. The fragmentation function for bottom quarks is determined to be peaked at large z with /sub b/ approx. = 0.75.

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 5670334
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
B MESONS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHARM PARTICLES
DATA
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LINEAR MOMENTUM
LONGITUDINAL MOMENTUM
MESONS
MUONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKS
SEMILEPTONIC DECAY
TRANSVERSE MOMENTUM
WEAK PARTICLE DECAY