deletions | additions       diff --git a/Mixing angle.tex b/Mixing angle.tex  index 689322a..90c3293 100644  --- a/Mixing angle.tex  +++ b/Mixing angle.tex 
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Determinations of the weak mixing angle $\sintw$ are made from a variety of measurements, such as the leptonic and hadronic forward-backward asymmetries or the $\tau$ polarization in ${\rm Z} \to \tau\tau$ decays. The single most precise measurement, however, comes from the inclusive left-right beam-polarization asymmetry $\ALR$. This quantity can be measured from the total cross-section asymmetry upon reversal of the polarization of the $\epem$ system.   For the same level of polarization in collisions as that observed at LEP, and assuming that a fraction of the bunches can be selectively depolarized, a simultaneous measurement~\cite{Blondel:1987wr} of the beam polarization and of the left-right asymmetry $\ALR$ can be envisioned at TLEP. For one year of data taking with a luminosity of $10^{35}\cms$, a precision on $\ALR$ of the order of $10^{-5}$ -- or a precision on $\sintw$ of the order of $10^{-6}$ -- is achievable. Other beam polarization asymmetries for selected final states, like for example  $A_{\rm FB}^{\rm pol,f}$, would allow precise measurements of the electroweak couplings, and be become  an interesting tool for flavour selection.\\ {\em A precision of ${\it 10^{-6}}$ on $\sintw$ is a reasonable goal for the measurement of the leptonic weak mixing angle at TLEP.}