Background particle rate of an Axion-like Particle Search at the DAMSA experiment

Aug 11, 2021, 10:00 AM


Min Sang RYU (CHEP)


With the 2012 discovery of the Higgs-like particle at CERN and its increasingly Standard Model-like properties, the primary interests of the field of particle physics are shifting to the study of the remaining 95% of the matter and energy in the universe, using accelerators. The so-called unseen aboriginal particles (UAPs) that make up a large fraction of the 95% could be produced and discovered in particle accelerators with high-intensity beams. Rare nuclear isotope accelerator facility, such as Rare isotope Accelerator complex for ON-line experiment (RAON) provides an excellent opportunity for discovery of UAPs. The axion-like particle (ALP) is a good candidate for the UAP and thus provides an excellent case study at the DAMSA (Dump produced Aboriginal Matter Searches at an Accelerator) experiment, a 610-ton liquid argon time projection chamber (LArTPC) detector at the immediate downstream of the beam dump, as a part of the proposed ARI AA (A Research Innovation and Infrastructure Initiative for the discovery of unseen Aboriginal particles at Accelerators) project. The primary background to the charge-neutral UAP searches at DAMSA, using the RAON facility, would be the secondary electromagnetic particles produced in the interactions of neutrons that come from the high-intensity 600MeV proton beams impinging on the iron dump, given the proximity of the detector to the source of the beam. In this talk, I will present a detailed GEANT4 based study on the production rate of background particles to the ALP search case study and a potential strategy to minimize the impact of the background from the secondary neutron interactions in the DAMSA detector.

Presentation materials