First measurement of the left-right cross section asymmetry in Z boson production by e+e- collisions

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doi:10.1103/PhysRevLett.70.2515

We present the first measurement of the left-right cross section asymmetry (ALR) for Z boson production by e+e- collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with the SLD detector at the SLAC Linear Collider which utilized a longitudinally polarized electron beam. The average beam polarization was (22.4±0.6)%. Using a sample of 10 224 Z decays, we measure ALR to be 0.100±0.044(stat)±0.004(syst), which determines the effective weak mixing angle to be sin2θWeff=0.2378 ±0.0056(stat)±0.0005(syst).

Abe, K., Abt, I., Acton, P., Adolphsen, C., Agnew, G., Alber, C., et al. (1993). First measurement of the left-right cross section asymmetry in Z boson production by e+e- collisions. PHYSICAL REVIEW LETTERS, 70(17), 2515-2520 [10.1103/PhysRevLett.70.2515].