Higgs pair production in [beta][beta][tau][tau] final states at the HL-LHC

Abstract

A measurement of standard model Higgs pair production in [beta][beta][tau][tau] final states at the High Luminosity LHC is investigated. Higgs pair production can be used to measure the Higgs trilinear coupling constant, which uniquely determines the shape of the Higgs potential. The doubly hadronic, hadron-muon, and hadron-electron di-[tau] final states are considered, with a shape analysis on either the stransverse mass (doubly hadronic) or a BDT discriminant (hadron-muon, hadron-electron) distribution performed to extract expected significances. The expected 95% CL upper limit on the cross section times branching ratio from a combination of all three channels is 2.2 times the SM value, with an expected +1[sigma] uncertainty on the measured cross section of 67%, indicating this measurement is feasible.