deletions | additions       diff --git a/13311371647823180.tex b/13311371647823180.tex  index f6e7bae..841b88b 100644  --- a/13311371647823180.tex  +++ b/13311371647823180.tex 
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\item Cross sections with a rapid variation as a function of the centre-of-mass energy (e.g., at the Z pole, or ar the WW and $\ttbar$ thresholds, as shown for example in Fig.~\ref{fig:ttbar} of Section~\ref{sec:EWSB}) are {\it (i)} larger; and {\it (ii)} calculable with better accuracy at TLEP, hence measured with smaller statistical and systematic uncertainties.  \item The forward region of a TLEP detector is free of beamstrahlung photons, which in turm tremendously eases both the design of a luminometer and the integrated luminosity measurement.  \item The beam-related backgrounds (disrupted beams, photons, $\epem$ pairs) originating from beamstrahlung are negligible at TLEP, and so are the parisitic $\gamma\gamma$ collisions, which would otherwise lead to significant pileup in the detector, and affect the reconstruction of jets, the determination of the missing energy and the efficiency/reliability of isolation criteria.  \item Final states with photons (e.g., ${\rm H} \to \gamma\gamma$, ${\rm H \to Z}\gamma$, or ${\rm Z} \to \nnbar\gamma$) are potentially pollute polluted  by beamstrahlung photons emitted at large angles with respect to the beam. These final states can therefore be selected with a much better purity at TLEP. \item The frequent emission of beamstrahlung photons along the beam axis (in both directions) weakens the use of energy and momentum constraints in kinematic fits, which in turn mostly rely on the conservation of the momentum transverse to the beam. The conditions offered by TLEP allow the four energy-momentum constraints to be optimally used in all fits.  \end{itemize}   In summary, the known assets of $\epem$ collisions -- cleanliness, calculability, numerous kinematic constraints, and absence of pile-up collisions -- are fully realized solely with circular colliders, mostly because of the absence of beamstrahlung. When it comes to precision measurements, these advantages come right after the larger integrated luminosity in order of importance.