Studies on the impact of an extended Inner Detector tracker and a forward muon tagger on $W^{\pm}W^{\pm}$ scattering in $pp$ collisions at the High-Luminosity LHC with the ATLAS experiment

The impact of an extended silicon tracker and a forward muon tagger on the measurement of the \ssWW vector boson scattering process is evaluated in proton-proton collisions at $\sqrt{s}$ = 14 TeV at the High-Luminosity Large Hadron Collider. Simulated events with two leptons of the same electric charge, missing transverse momentum, and at least two jets are analysed. The gain in significance and precision obtained with tracking, electron, and muon reconstruction extended up to $|\eta|$ $\le$ 4 is reported, with respect to the current coverage of $|\eta|$ $\le$ 2.7.