On direct observation of millicharged particles at $c$-$τ$ factories and other $e^+e^-$-colliders

Dmitry Gorbunov; Dmitry Kalashnikov; Pavel Pakhlov; Timofey Uglov

doi:10.1016/j.physletb.2023.138033

paper

On direct observation of millicharged particles at $c$ - $τ$ factories and other $e^{+} e^{-}$ -colliders

arXiv:2208.03377 · doi:10.1016/j.physletb.2023.138033

Abstract

Hypothetical particles with tiny electric charges (millicharged particles or MCPs) can be produced in electron-positron annihilation if kinematically allowed. Typical searches for them at $e^{+} e^{-}$ colliders exploit a signature of a single photon with missing energy carried away by the undetected MCP pair. We put forward an idea to look alternatively for MCP energy deposits inside a tracker, which is a direct observation. The new signature is relevant for non-relativistic MCPs, and we illustrate its power on the example of the $c$ - $τ$ factory, where we argued that the corresponding searches may be background-free. We find that it can probe the MCP charge down to $3 \times 1 0^{- 3}$ of the electron charge for the MCP masses in $O (5)$ MeV vicinity of each energy beam value where the factory will collect a luminosity of 100 fb $^{- 1}$ in one year. This mass region is unreachable with the searches for missing energy and single photon.

arXiv comment12 pages, 3 figures; v2: the background-free signature is introduced

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

On direct observation of millicharged particles at c-τ factories and other e+e−-colliders

Abstract

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Cited by in corpus (1)

On direct observation of millicharged particles at $c$ - $τ$ factories and other $e^{+} e^{-}$ -colliders