Measurement of $e^+ e^- \to \tau^+ \tau^-$ at High-energy and Properties of the $\tau$ Lepton

The e + e − → τ + τ − process has been measured using the CELLO detector at a mean total centre of mass energy of 34.2 GeV using essentially all the decay channels of the τ lepton. The measured cross section yields R τ =1.03±0.05 (stat)±0.07 (syst). Topological branching fraction are given for τ → 1, 3 or 5 charged tracks. The angular distribution shows a clear 1 + cos 2 θ dependance with a forward-backward asymmetry of -0.103 ± 0.052 corresponding to an axial-vector coupling a τ of the τ to the weak neutral current given by a τ =−1.12 ± 0.57.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
TAU: ELECTROPRODUCTION
ELECTROPRODUCTION: TAU
TAU: PAIR PRODUCTION
PAIR PRODUCTION: TAU
CHANNEL CROSS SECTION
DIFFERENTIAL CROSS SECTION: ASYMMETRY

References(9)

Figures(0)

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Measurement of e+e−→τ+τ−e^+ e^- \to \tau^+ \tau^-e+e−→τ+τ− at High-energy and Properties of the τ\tauτ Lepton

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Measurement of $e^+ e^- \to \tau^+ \tau^-$ at High-energy and Properties of the $\tau$ Lepton