Speaker
Description
Sub-GeV light dark matter often requires new light mediators, such as a dark Z' boson in the Lµ − Lτ gauge theory. We study the search potential for such a Z' boson via the process µe −> µeX,with X decaying invisibly, in a muon on-target experiment using a high-intensity 1–10 GeV muon beam from facilities such as HIAF-HIRIBL. Events are identified by the scattered muon and electron from the target using the silicon strip detectors in a single-station telescope system. Backgrounds are suppressed through a trained BDT classifier, and activity in downstream subdetectors remains low. We find that this approach can probe a Z' in the 10 MeV mass range with improved sensitivity. Nearly three orders of magnitude improvement is achievable using a full multi-telescope station system using a 160 GeV muon beam at CERN, such as in the MUonE experiment.
