Probing New Gauge Forces with a High-Energy Muon Beam Dump.

Area of Science:

• Particle Physics
• Collider Physics
• Beyond Standard Model Physics

Background:

• Future TeV-scale muon colliders offer unique opportunities for new physics searches.
• Beam-dump experiments provide a complementary approach to traditional collider searches.
• Vector models like the dark photon and Lμ-Lτ gauge boson are well-motivated extensions to the Standard Model.

Purpose of the Study:

• To propose and evaluate a novel beam-dump experiment at a future TeV-scale muon collider.
• To explore the discovery potential for dark photon and Lμ-Lτ gauge boson models.
• To identify new regions of parameter space accessible with a muon beam dump.

Main Methods:

• Simulating a beam-dump setup at a TeV-scale muon collider.
• Analyzing sensitivity reach for dark photon and Lμ-Lτ gauge boson models.
• Comparing the proposed experiment's reach with existing and planned experiments.

Main Results:

• The proposed muon beam-dump experiment offers enhanced discovery potential in a complementary regime.
• Sensitivity is gained in the MeV-GeV mass range for the dark photon model at both higher and lower couplings.
• Previously unexplored parameter space for the Lμ-Lτ gauge boson model can be accessed.

Conclusions:

• A muon beam-dump experiment is an economical and effective method to increase discovery potential at future colliders.
• This approach significantly expands the search capabilities for dark photons and Lμ-Lτ gauge bosons.
• The proposed experiment opens new avenues for probing beyond Standard Model physics.