Tau custodian searches at the LHC

The tau lepton can be more composite than naively expected in models of strong electroweak symmetry breaking with tri-bimaximal lepton mixing. New leptonic resonances required by custodial symmetry, the tau custodians, can then be the first signal of this lepton flavour realization. Tau custodians can be very light, decaying almost exclusively into taus. The LHC reach for these new leptons is up to masses of 240, 480 and 720 GeV for s=14 TeV and an integrated luminosity of 30, 300 and 3000 fb−1, respectively. Our analysis can be extended to any pair produced particles decaying mostly into taus and Standard Model bosons.