Direct Measurement of Ab and Ac at the Z0 Pole Using a Lepton Tag

Technical Report · Thu Jun 17 04:00:00 EDT 1999

OSTI ID:6296510

Fahey, Salvatore

The parity violation parameters A_b and A_c of the Zb anti-b and Zc anti-c couplings have been measured directly, using the polar angle dependence of the Z⁰-pole polarized cross sections. Bottom and charmed hadrons were tagged via semileptonic decays. Both the muon and electron identification algorithms take advantage of new multivariate techniques, incorporating for the first time information from the SLD Cerenkov Ring Imaging Detector. Based on the 1993-95 SLD sample of 150,000 Z⁰ decays produced with highly polarized electron beams, we measure: A_b = 0.910 0.068(stat) 0.037(syst) A_c = 0.642 0.110(stat) 0.063(syst).

• Research Organization: Stanford Linear Accelerator Center (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: ER
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6296510
• Report Number(s): SLAC-PUB-7798; ON: DE00009902
• Country of Publication: United States
• Language: English

Related Subjects

660000* -- Physics-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
B QUARKS
BEAUTY PARTICLES
BOSONS
C QUARKS
CHARM PARTICLES
COUPLING
DECAY
ELEMENTARY PARTICLES
FERMIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INVARIANCE PRINCIPLES
P INVARIANCE
PARTICLE DECAY
QUARKS
SEMILEPTONIC DECAY
SYMMETRY BREAKING
WEAK PARTICLE DECAY
Z NEUTRAL BOSONS