Millicharged particles at electron colliders

Abstract

We propose to search for millicharged particles in electron colliders operated with the center-of-mass energies at $\mathcal{O}$(1-10) GeV, which include Belle II, BESIII, BaBar, and also the proposed experiment STCF. We use the monophoton final state at electron colliders to probe the parameter space of millicharged particles, that is spanned by millicharge $\epsilon$ and mass $m$. We find that electron colliders have sensitivity to the previously unexplored parameter space for millicharged particles with MeV-GeV mass: $\epsilon \lesssim \mathcal{O}(10^{-1})$ for $0.5$ GeV $\lesssim m\lesssim 3.5$ GeV in BaBar, $\epsilon \lesssim \mathcal{O}(10^{-3})$ for $0.1$ GeV $\lesssim m\lesssim 1.5$ GeV in BESIII, $\epsilon \lesssim 10^{-3}-10^{-2}$ for $0.1$ GeV $\lesssim m\lesssim 4$ GeV in Belle II, and $\epsilon \lesssim \mathcal{O}(10^{-4})$ for $1$ MeV $\lesssim m\lesssim 1$ GeV in STCF.

8 pages, 9 figures; v2: journal version

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Cited by in corpus (18)

• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Cosmological Constraints on Dark Matter Interactions with Ordinary Matter
• New Constraints on Millicharged Particles from Cosmic-ray Production
• Millicharged Cosmic Rays and Low Recoil Detectors
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• Muon g-2 from Millicharged Hidden Confining Sector
• Can millicharge be probed at future Super Tau Charm Facility via mono-${\pi }^0$ searches?