Coupling Strengths of Weak Neutral Currents From Leptonic Final States at 22-{GeV} and 34-{GeV} - INSPIRE

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Coupling Strengths of Weak Neutral Currents From Leptonic Final States at 22-{GeV} and 34-{GeV}

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

Sep, 1982

15 pages

Published in:

Z.Phys.C 16 (1983) 301

DOI:

10.1007/BF01577097

Report number:

DESY-82-063

View in:

KEK scanned document

reference search57 citations

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Abstract: (Springer)

Differential cross sections fore+e−→e+e−, τ+, τ- measured with the CELLO detector at

\left\langle {\sqrt s } \right\rangle= 34.2GeV

have been analyzed for electroweak contributions. Vector and axial vector coupling constants were obtained in a simultaneous fit to the three differential cross sections assuming a universal weak interaction for the charged leptons. The results,v2=−0.12±0.33 anda2=1.22±0.47, are in good agreement with predictions from the standardSU(2)×U(1) model for

\sin ^2 \theta _w= 0.228

. Combining this result with neutrino-electron scattering data gives a unique axial vector dominated solution for the leptonic weak couplings. Assuming the validity of the standard model, a value of

\sin ^2 \theta _w= 0.21_{ - 0.09}^{ + 0.14}

is obtained for the electroweak mixing angle. Additional vector currents are not observed (C<0.031 is obtained at the 95% C.L.).

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
ELECTRON POSITRON: ELASTIC SCATTERING
ELASTIC SCATTERING: ELECTRON POSITRON
MUON: ELECTROPRODUCTION
ELECTROPRODUCTION: MUON
MUON: PAIR PRODUCTION
PAIR PRODUCTION: MUON

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Figures(0)

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