Heavy quark jets from electron-positron annihilation at 29 GeV

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

OSTI ID:6063272

Lu, X

The authors have studied the production of prompt leptons (e,..mu..) in hadronic events from e/sup +/e/sup -/ annihilation at a center-of-mass energy of 29 Gev with the TPC detector at SLAC. The total integrated luminosity was 77 pb/sup -1/. The lepton p and p/sub t/ distributions were well described by a combination of bottom and charm quark decays. They derived neutral axial vector couplings of a(b quark) = -1.1 +/- 0.9 +/- 0.3 and a(c quark) = 1.9 +/- 1.0 +/- 0.4 from the forward-backward asymmetries in good agreement with the Glashow-Weinberg Salam model. In addition, they compared these events with the average multihadron events in order to examine differences between jets with different original quark types. This was the first measurement of the differential cross section for ..pi.. +/- and the mean multiplicities for different species of hadrons in different quark events. They found a significant difference between the ..pi.. +/- and hadron multiplicities in b anti b events versus light quark events, and a significant difference between the K +/- multiplicities in heavy quark events versus light quark events. They also found the corresponding non-leading multiplicities of charged particles accompanying the pair of heavy hadrons, and then determined the mean energy with which that bottom and charm hadrons fragment.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA)
• OSTI ID: 6063272
• 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
B MESONS
BASIC INTERACTIONS
BOSONS
CHARM PARTICLES
CROSS SECTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
HYPOTHESIS
INFORMATION
INTERACTIONS
JET MODEL
KAONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIMITING FRAGMENTATION
MATHEMATICAL MODELS
MESONS
MULTIPLE PRODUCTION
MULTIPLICITY
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PEP STORAGE RINGS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKS
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES