Search for supersymmetry with direct stau production at the HL-LHC with the CMS Phase-2 detector

A search for the direct production of $\tau$ sleptons ($\widetilde{\tau}$) is developed assuming $3000~\mathrm{fb}^{-1}$ of proton-proton collision data produced by the HL-LHC at a center-of-mass energy of $14~\mathrm{TeV}$. Three final states are investigated: two $\tau$ leptons decaying hadronically, and one $\tau$ lepton decaying hadronically and the other one decaying to a muon or electron and neutrinos. The analysis is performed using the Delphes simulation of the CMS Phase-2 detector where the object reconstruction performance is tuned to the one achieved with CMS Phase-2 full simulation. In the mass-degenerate production scenario, $\widetilde{\tau}$ masses are excluded below $650~\mathrm{GeV}$, with the discovery contour of $\widetilde{\tau}$ masses reaching up to $470~\mathrm{GeV}$. $$\textit{This document has been revised with respect to the version dated November 11, 2018.}$$