The DAMSA Experiment
Prithak Bhattarai, Andrew Brandt, Alan Bross, Bradley Brown, Samriddha Chakraborty, Haohui Che, Bhupal Dev, Bhaskar Dutta, Juan V. Estrada, Eric Garcia, Anthony Gomez, Gajendra Gurung, Brian Joshua Gomez Hernandez, Wooyoung Jang, Jay Hyun Jo, Krzysztof Jod{\l}owski, Doojin Kim

TL;DR
DAMSA is a novel short-baseline accelerator experiment designed to detect short-lived dark sector particles and rare Standard Model signals, employing a compact detector and beam-dump scheme to overcome sensitivity limitations of longer-baseline experiments.
Contribution
The paper introduces the DAMSA experiment concept and its Path-Finder prototype, demonstrating a new approach to probing short-lived particles in a previously inaccessible regime.
Findings
DAMSA can detect MeV-to-sub-GeV dark-sector messengers with feeble couplings.
The Path-Finder experiment validates the feasibility of DAMSA's detection strategy.
DAMSA's short baseline overcomes the sensitivity ceiling of traditional beam dump experiments.
Abstract
DAMSA (DArk Messenger Searches at an Accelerator) is a novel short-baseline accelerator/beam dump experiment aimed at probing short-lived physics processes, including searches for evidence of a dark sector of particle physics and well-motivated rare Standard Model signals. Motivated by open questions in neutrino physics and the absence of conclusive evidence for conventional weakly interacting massive particles, DAMSA targets MeV-to-sub-GeV dark-sector messengers with feeble couplings that can be produced in abundance at a beam dump/target. By employing an ultra-short baseline, DAMSA is uniquely positioned to overcome the beam-dump "ceiling" that limits sensitivity to fast decaying particles in longer-baseline experiments. The conceptual design emphasizes a beam-dump production scheme combined with a compact detector optimized for rare decays while mitigating intense neutron-induced…
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