Probing a Heavy Dark $Z$ Boson at Multi-TeV Muon Colliders: Leveraging the Optimized Recoil Mass Technique

Kingman Cheung, Jinheung Kim, Soojin Lee +2

We investigate the discovery potential of multi-TeV muon colliders for a heavy dark $Z$ boson ($Z_{\mathrm{D}}$) with a mass above 1 TeV through the associated production channel $μ^+μ^…