Showing papers by "D. Su published in 1992"
01 Dec 1992
TL;DR: The average beam polarization for this set of Z decays was 22.6% and was measured to be 0.004(syst.). From this measurement, the weak mixing angle defined at the Z boson pole is determined to be sin{sup 2{theta}{sup eff}{sub W} = 0.0005 as discussed by the authors.
Abstract: The SLAC Linear Collider (SLC) has been modified to collide a longitudinally polarized electron beam with the unpolarized positron beam. We review the beginning of polarized beam running at the SLC, and report on the measurement of the left-right cross section asymmetry (A{sub LR}) made with a sample of 10,224 Z decays collected over the course of the 1992 run. The average beam polarization for this set of Z decays was 22.4 {plus_minus} 0.6%(syst.). A{sub LR} was measured to be 0.100 {plus_minus} 0.044(stat.) {plus_minus} 0.004(syst.). From this measurement, the weak mixing angle defined at the Z boson pole is determined to be sin{sup 2}{theta}{sup eff}{sub W} = 0.2378 {plus_minus} 0.0056 {plus_minus} 0.0005.