A study of jet rates and measurement of α_s at the Z⁰ resonance

Conference · Sun Nov 01 04:00:00 EST 1992

OSTI ID:10191117

Lauber, J. A. ^[1]

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1. Colorado Univ., Boulder, CO (United States)

We present jet rates in hadronic decays of Z⁰ bosons measured by the SLD experiment at SLAC. The data are analyzed in terms of the JADE and recently proposed Durham algorithms, and are found to be in agreement with the predictions of perturbative QCD plus fragmentation Monte Carlo models of hadron production. Corrected 2, 3 and 4-jet rates are well described by ω(α_s²) perturbative QCD calculations. From fits to the differential 2-jet distribution the strong coupling α_s(M_Z) is measured to be α_s(M_Z) = 0.119 ± 0.002(stat.) } ± 0.003(exp.syst.) ± 0.014(theory) (preliminary). The largest contribution to the error arises from the theoretical uncertainty in choosing the QCD renormalisation scale.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• Contributing Organization: The SLD Collaboration
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 10191117
• Report Number(s): SLAC-PUB--5974; COLO-HEP--293; CONF-921122--1; ON: DE93004092
• Country of Publication: United States
• Language: English

Related Subjects

662380
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
DECAYS OF INTERMEDIATE BOSONS
ELECTRON-POSITRON INTERACTIONS
HADRONIC PARTICLE DECAY
JET MODEL
MONTE CARLO METHOD
QUANTUM CHROMODYNAMICS
STANFORD LINEAR COLLIDER DETECTOR
Z NEUTRAL BOSONS