Can millicharge be probed at future Super Tau Charm Facility via mono-${\pi }^0$ searches?

Abstract

We propose a new channel to search for millicharged particles at the future Super Tau Charm Facility (STCF) via mono-${\pi }^0$ signature. For the first time, we compute the mono-${\pi }^0$ 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 $\sqrt{s}=2$ GeV, 4 GeV and 7 GeV, we derive the corresponding upper limits on millicharge, respectively. Via mono-${\pi }^0$ searches at the future STCF with $\sqrt{s}=2$ 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-${\pi }^0$ searches could be an important complement to investigate the invisible particles, such as dark matter.

5 pages+refs, 3 figures. Accepted for publication in Physics Letters B

References in corpus (15)

• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• Looking for milli-charged particles with a new experiment at the LHC
• FORMOSA: Looking Forward to Millicharged Dark Sectors
• Scattering of Dark Particles with Light Mediators
• Search for millicharged particles in proton-proton collisions at $\sqrt{s}=13$ TeV
• Blast from the past: Constraints on the dark sector from the BEBC WA66 beam dump experiment
• Modeling interactions of photons with pseudoscalar and vector mesons
• Limits on the abundance of millicharged particles bound to matter
• Trapped electrons and ions as particle detectors
• FLArE up dark sectors with EM form factors at the LHC Forward Physics Facility
• EKHARA Monte Carlo generator for e+e- to e+e-pi0 and e+e- to e+e- pi+pi- processes
• Single ${\pi }^0$ production in $\mu e$ scattering at MUonE
• Double-Hit Signature of Millicharged Particles in 3D segmented neutrino detector
• Probing light exotics from a hidden sector at $c$-$\tau$ factories with polarized electron beams
• On direct observation of millicharged particles at $c$-$\tau$ factories and other $e^{+}{e}^{-}$-colliders