Speaker
Description
We propose DREAMuS (Dark matter REsearch with Advanced Muon Source), a new fixed-target experiment at the High-Intensity Heavy-Ion Accelerator Facility (HIAF) in China, dedicated to searching for muon-philic dark matter. Unlike traditional electron-beam experiments, DREAMuS utilizes a GeV-scale muon beam to explore dark sectors that preferentially couple to the second generation of leptons. The experiment specifically targets new gauge bosons (vector or scalar) that mediate flavor-violating interactions and decay into invisible final states.
The search signature consists of a single high-transverse-momentum electron accompanied by significant missing momentum. The DREAMuS detector concept integrates high-precision tracking with advanced time-of-flight (TOF) systems, enabling the robust suppression of irreducible Standard Model backgrounds, such as beam remnant, muon-nuclear scattering, and rare muon decays. Our simulation studies indicate that DREAMuS can achieve competitiv sensitivity to GeV-scale dark matter, particularly in the low-mass region. Furthermore, we demonstrate that the addition of an anti-muon beam configuration significantly enhances the discovery potential in the sub-GeV mass region.
