Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-21
Phys.Rev. D53 (1996) 2724-2728
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, latex, 1 uuencoded figure sent separately
Scientific paper
10.1103/PhysRevD.53.2724
The impact of atomic parity violation experiments on determination of the weak mixing parameter $\sin^2 \theta$ and the Peskin-Takeuchi parameters $S$ and $T$ is reassessed in the light of recent electroweak measurements at LEP, SLAC, and Fermilab. Since the weak charge $Q_W$ provides unique information on $S$, its determination with a factor of four better accuracy than present levels can have a noticeable effect on global fits. However, the measurement of $\Delta Q_W / Q_W$ for two different isotopes provides primarily information on $\sin^2 \theta$. To specify this quantity to an accuracy of $\pm 0.0004$, comparable to that now provided by other electroweak experiments, one would have to determine $\Delta Q_W/Q_W$ in cesium to about 0.1\% of its value, with comparable demands for other nuclei. The relative merits of absolute measurements of $Q_W$ and isotope ratios for discovering effects of new gauge bosons are noted briefly.
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