Letter of Intent: Search for sub-millicharged particles at J-PARC

Abstract

We propose a new experiment sensitive to the detection of millicharged particles produced at the $30$ GeV proton fixed-target collisions at J-PARC. The potential site for the experiment is B2 of the Neutrino Monitor building, $280$ m away from the target. With ${\text{N}}_{\text{POT}}=10^{22}$, the experiment can provide sensitivity to particles with electric charge $3\times 10^{-4}e$ for mass less than $0.2$ $\text{GeV}/{\text{c}}^2$ and $1.5\times 10^{-3}e$ for mass less than $1.6$ $\text{GeV}/{\text{c}}^2$. This brings a substantial extension to the current constraints on the charge and the mass of such particles.

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• Search for Millicharged Particles at SLAC
• Searches for long-lived charged particles in pp collisions at sqrt(s) = 7 and 8 TeV
• Direct Detection of Strongly Interacting Sub-GeV Dark Matter via Electron Recoils
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Cited by in corpus (5)

• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• FORMOSA: Looking Forward to Millicharged Dark Sectors
• Millicharged Cosmic Rays and Low Recoil Detectors
• A Snowmass Whitepaper: Dark Matter Production at Intensity-Frontier Experiments
• LHC experiments for long-lived particles of the dark sector