Production Cross-section and Topological Decay Branching Fractions of the $\tau$ Lepton

Abachi, S.; Derrick, M.; Kooijman, P.; Musgrave, B.; Price, L.E.; Repond, J.; Sugano, K.; Blockus, D.; Brabson, B.; Brom, J.M.

doi:10.1103/PhysRevD.40.902

Production Cross-section and Topological Decay Branching Fractions of the $\tau$ Lepton

HRS

Collaboration

•

S. Abachi
(
- Argonne
)

Dec, 1988

9 pages

Published in:

Phys.Rev.D 40 (1989) 902

DOI:

10.1103/PhysRevD.40.902

PDG:

{{\mathit \tau}^{-}}

\rightarrow

{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}{{\mathit \nu}_{{{\tau}}}}

Report number:

ANL-HEP-PR-88-90,
IUHEE-88-9,
UM-HE-88-38,
PU-88-624

Experiments:

SLAC-PEP-012

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Abstract: (APS)

We report new measurements of the production cross section for the reaction e+e−→τ+τ− at s=29 GeV, as well as the topological decay branching fractions of the τ lepton. The data were taken with the High Resolution Spectrometer at the SLAC e+e− colliding-beam facility PEP. The measured cross section yields Rττ=1.044±0.014±0.030 [where the first (second) error is statistical (systematic)], consistent with QED and corresponding to QED cutoff parameters of Λ+>129 GeV and Λ−>284 GeV at the 95% C.L. The fractions of τ decays into one and three charged particles are B1=0.864±0.003±0.003 and B3=0.135±0.003±0.003.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
TAU: ELECTROPRODUCTION
ELECTROPRODUCTION: TAU
TAU: PAIR PRODUCTION
PAIR PRODUCTION: TAU
TAU: SEMILEPTONIC DECAY
SEMILEPTONIC DECAY: TAU