Search for new physics with high-mass $\tau$-lepton pairs in pp collisions at 13 TeV with the CMS detector

A search for new physics in the high mass ditau final state is performed using data from proton- proton collisions at a center-of-mass energy of 13 TeV. The data were collected by the CMS experiment during 2015 with an integrated luminosity of 2.2 fb − 1 [ 1 ]. Many theorical models that include extensions of the fundamental symmetry of the Standard Model predict the existence of massive neutral vector bosons, generically called Z ′ . The search of Z ′ decaying into tau pairs is particulary interesting since in some models this bosons would be coupled preferentially to the third generation of the SM fermions.