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An improved direct measurement of leptonic coupling asymmetries with polarized Z bosons

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abstract

We present final measurements of the Z boson-lepton coupling asymmetry parameters Ae, Amu, and Atau with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure Ae = 0.1544 +- 0.0060, Amu = 0.142 +- 0.015, and Atau = 0.136 +- 0.015. Combined with our left-right asymmetry measured from hadronic decays, we find Ae = 0.1516 +- 0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin**2 theta^{eff}_W = 0.23098 +- 0.00026.

fields

hep-ex 1

years

2026 1

verdicts

UNVERDICTED 1

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An AI-ready, Polarized Electron-Positron Collision Dataset

hep-ex · 2026-05-29 · unverdicted · novelty 5.0

Release of an AI-ready dataset containing approximately 660,000 reconstructed polarized e+e- collision events at 91.2 GeV from the SLD experiment, translated from legacy formats with accompanying digitized documentation.

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  • An AI-ready, Polarized Electron-Positron Collision Dataset hep-ex · 2026-05-29 · unverdicted · none · ref 7 · internal anchor

    Release of an AI-ready dataset containing approximately 660,000 reconstructed polarized e+e- collision events at 91.2 GeV from the SLD experiment, translated from legacy formats with accompanying digitized documentation.