Novel Way to Search for Light Dark Matter in Lepton Beam-Dump Experiments

Area of Science:

• Particle Physics
• Cosmology
• Experimental Physics

Background:

• Current experimental limits on light dark matter are constrained by existing detection methods.
• Beam-dump experiments are a promising avenue for probing dark matter candidates.
• Understanding particle interactions in high-energy environments is crucial for new physics searches.

Purpose of the Study:

• To propose a novel mechanism for producing and detecting light dark matter.
• To enhance the sensitivity of beam-dump experiments for dark matter searches.
• To explore new annihilation channels for dark matter particle (A') production.

Main Methods:

• Utilizing GeV electrons and positrons impinging on a thick target (beam dump).
• Leveraging the positron-rich environment from electromagnetic showers.
• Employing nonresonant (e+ + e- → γ + A') and resonant (e+ + e- → A') annihilation on atomic electrons.

Main Results:

• The resonant annihilation mechanism offers potentially higher sensitivity than traditional A'-strahlung.
• The proposed method significantly improves upon existing limits for light dark matter detection.
• An order-of-magnitude improvement in sensitivity is achievable for beam-dump experiments.

Conclusions:

• The novel mechanism provides a more sensitive approach to light dark matter detection.
• This method is applicable to both standard and active beam-dump experiments.
• The findings push down current experimental limits, opening new windows for dark matter exploration.