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The detector designs developed for the ILC~\cite{cite:ILCTDR} or for CLIC~\cite{cite:CLICDR} include a highly granular calorimetry for particle-flow purposes. The 3D granularity allows hadron showers to be tracked individually, towards an optimally efficient neutral hadron identification, hence a better energy resolution for jets. This technical choice, however, poses power dissipation and cooling challenges. The solution of a pulsed electronics, chosen for linear colliders, cannot be exploited at circular colliders because of the large repetition rate.  More conservative choices have therefore been made so far in the evaluation of the TLEP physics case potential. For example, a study -- carried out in Ref.~\cite{cite:1208.1662} with the CMS detector at $\sqrt{s} = 240$ GeV -- demonstrated that the Higgs coupling accuracy is close to being optimal even with a more conventional detector. The underlying reason is that  the precise measurement of jet energies is most often not a determining factor in $\epem$ collisions: for events with no or little missing mass, jet energies can be determined with precision from their directions and energy-momentum conservation. The TLEP design study aims, in particular, at defining the minimal detector performance needed to measure the Higgs boson couplings and the EWSB parameters with the desired precision. In the meantime, the choice made in Ref.~\cite{cite:1208.1662} is adopted in this note too to make a conservative estimate of the TLEP potential: the performance of the CMS detector are assumed throughout. The only exceptions are {\it (i)} the vertex detector, for which performance similar to those of a linear collider detector are needed, with lifetime-based c-tagging capabilities; and {\it (ii)} a precision device for luminosity measurement with Bhabha scattering, absent in the CMS design.