PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Beyond the Standard Model
Search for sub-millicharged particles at J-PARC
H.Β Jeong* Β on behalf of the SUBMET collaboration
Full text: pdf
Pre-published on: November 29, 2022
Published on: June 15, 2023
Electric charge quantization is a long-standing question in particle physics. While fractionally charged particles (millicharged particles hereafter) have typically been thought to preclude the possibility of Grand Unified Theories (GUTs), well-motivated dark-sector models have been proposed to predict the existence of millicharged particles while preserving the possibility for unification. Such models can contain a rich internal structure, providing candidate particles for dark matter. A number of experiments have searched for millicharged particles (πœ’s), but in the parameter space of the charge (𝑄) and mass (π‘š_πœ’), the region of π‘š_πœ’ > 0.1 GeV/𝑐^2 and 𝑄 < 10^{βˆ’3}𝑒 is largely unexplored. SUB-Millicharge ExperimenT (SUBMET) has been proposed to search for sub-millicharged particles using 30 GeV proton fixed-target collisions at J-PARC. The detector is composed of two layers of stacked scintillator bars and PMTs, and is proposed to be installed 280 m from the target. The main background is expected to be a random coincidence between the two layers due to dark counts in PMTs, which can be reduced significantly using the timing of the proton beam. With 𝑁_{POT} = 5Γ—10^{21}, the experiment provides sensitivity to πœ’s with the charge
down to 7Γ—10^{βˆ’5}𝑒 in π‘š_πœ’ < 0.2 GeV/𝑐^{2} and 10^{βˆ’3}𝑒 in π‘š_πœ’ < 1.6 GeV/𝑐^2. This is the regime largely uncovered by the previous experiments
DOI: https://doi.org/10.22323/1.414.0181
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