deletions | additions       diff --git a/13311371647823180.tex b/13311371647823180.tex  index 0d08f0a..beae31d 100644  --- a/13311371647823180.tex  +++ b/13311371647823180.tex 
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\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 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 used in all fits.  \end{itemize}   In summary, the known advantages of $\epem$ collisions -- cleanliness, calculability, numerous kinematic constraints, and absence of pile-up collisions -- are fully realized solely in circular colliders, especially mostly  because of the absence of beamstrahlung. When it comes to precision measurements, these advantages come right after the large integrated luminosity in order of importance.