deletions | additions       diff --git a/Longitudinal Polarization Experiments.tex b/Longitudinal Polarization Experiments.tex  index c29df54..6970a6f 100644  --- a/Longitudinal Polarization Experiments.tex  +++ b/Longitudinal Polarization Experiments.tex 
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Movable spin rotators as designed for HERA~\cite{cite:HERA-beams} would therefore allow a program of longitudinal polarized beams at the Z peak. (The spin rotator design foreseen for LEP requires tilting the experiments and is unpractical for TLEP.) 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, $A_{\rm FB}^{\rm pol,f}$, would allow precise measurements of the electroweak couplings, and be an interesting tool for flavour selection.  \subsubsection{Polarization at higher energies}