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

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

2000-10-06

arxiv.org/abs/hep-ex/0010015v1

Phys.Rev.Lett.86:1162-1166,2001

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages latex, including 1 figure. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.1162

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.

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