Measurement of [tau] polarisation in Z[sup 0] decays

Conference · Sat Feb 01 04:00:00 EST 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5543946

Kumar, K S ^[1]

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1. Department of Physics, Harvard University, Cambridge, MA 02138 (United States)

We present measurements of the [tau] polarization in e[sup +]e[sup [minus]][r arrow][tau][sup +][tau][sup [minus]] from the four LEP experiments. From these measurements, the ratios of the vector and axial vector coupling constants of the electron and the tau lepton to the weak neutral current are obtained to be [ital g][sub [ital Ve]]/[ital g][sub [ital Ae]]=0.666[plus minus]0.015 and [ital g][sub [ital V][tau]]/[ital g][sub [ital A][tau]]=0.070[plus minus]0.009 respectively, constituting a sensitive test of e-[tau] universality in weak neutral current interactions. In the Standard Model, this leads to a value of the weak mixing angle at [ital Q][sup 2] = [ital m][sub Z][sup 2] of sin[sup 2][theta][sub eff]=0.2326[plus minus]0.0020.

• OSTI ID: 5543946
• Report Number(s): CONF-920837--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 272:1
• Country of Publication: United States
• Language: English

Related Subjects

662310* -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662370 -- Decays of Leptons-- (1992-)
662380 -- Decays of Intermediate Bosons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANNIHILATION
AXIAL-VECTOR CURRENTS
BASIC INTERACTIONS
BOSONS
COUPLING CONSTANTS
CURRENTS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRON-MUON UNIVERSALITY
ELECTRON-MUON-TAU UNIVERSALITY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEP STORAGE RINGS
LEPTON-LEPTON INTERACTIONS
LEPTONIC DECAY
LEPTONS
MATHEMATICAL MODELS
MIXING
NEUTRAL CURRENTS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
POLARIZATION
POSTULATED PARTICLES
STANDARD MODEL
STORAGE RINGS
TAU PARTICLES
UNIFIED GAUGE MODELS
VECTOR CURRENTS
WEAK INTERACTIONS
WEAK NEUTRAL CURRENTS
WEAK PARTICLE DECAY
Z NEUTRAL BOSONS