We propose a new channel to search for millicharged particles at the future Super Tau Charm Facility (STCF) via mono-π⁰ signature. For the first time, we compute the mono-π⁰ signal events at the future STCF due to millicharged particle production, as well as due to standard model irreducible/reducible backgrounds. By utilizing the assumed 20 ab⁻¹ luminosity for each running energy with √s= 2 GeV, 4 GeV and 7 GeV, we derive the corresponding upper limits on millicharge, respectively. Via mono-π⁰ searches at the future STCF with √s=2 GeV, the upper limits on millicharge can be improved than ArgoNeuT when the mass of millicharged particle is less than about 500 MeV, but are not very competitive compared to a latest derivation from a past BEBC experiment and a new SENSEI experiment. Regardless, the mono-π⁰ searches could be an important complement to investigate the invisible particles, such as dark matter.
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Z. Yu (2024) studied this question.
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