Charge Asymmetry Measurement in $e^+ e^- \to \mu^+ \mu^-$ and $\tau^+ \tau^-$ Reactions at $\sqrt{s}=52$-{GeV}

The reactions e + e − → μ + μ − and τ + τ − were measured at s =52 GeV and 55 GeV by using the TOPAZ detector at TRISTAN. For the combined data, the observed charge asymmetry is −0.29±0.13 and the total cross section is 27.9±3.0 (stat.)±0.8 (syst.) pb for μ + μ − production, and those for τ + τ − production are −0.20±0.14 and 35.7±4.3 (stat.)±2.4 (syst.)pb, respectively. These values are consistent with predictions by the standard model of electroweak interactions.

ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
MUON: PAIR PRODUCTION
PAIR PRODUCTION: MUON
TAU: PAIR PRODUCTION
PAIR PRODUCTION: TAU
LEPTON: ELECTROPRODUCTION
ELECTROPRODUCTION: LEPTON
DIFFERENTIAL CROSS SECTION
CHANNEL CROSS SECTION

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Charge Asymmetry Measurement in e+e−→μ+μ−e^+ e^- \to \mu^+ \mu^-e+e−→μ+μ− and τ+τ−\tau^+ \tau^-τ+τ− Reactions at s=52\sqrt{s}=52s​=52-{GeV}

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Charge Asymmetry Measurement in $e^+ e^- \to \mu^+ \mu^-$ and $\tau^+ \tau^-$ Reactions at $\sqrt{s}=52$ -{GeV}