Does a dark photon exist with MeV to GeV mass?
In plain words
A dark photon would be a heavy cousin of the photon that mixes slightly with ordinary light. It would appear as a narrow bump in electron-positron pair masses or as missing energy.
Precise statement
Determine whether a $U(1)'$ gauge boson $A'$ with mass $1\,\mathrm{MeV}$ to $10\,\mathrm{GeV}$ and kinetic mixing $\epsilon \sim 10^{-6}\ \text{to}\ 10^{-3}$ exists, in visible ($A' \to \ell+ \ell-$) or invisible decay modes. An answer is a resonance detection or exclusion of the remaining parameter space down to $\epsilon \sim 10^{-6}\ \text{to}\ 10^{-5}$.
What would settle it
Bump hunts and displaced-vertex searches at LHCb, Belle II, HPS, NA64 and future beam dumps (SHiP).
Problems built on this one
Special cases
- Do missing-momentum experiments find MeV-GeV dark sector production? · open
- Origin of the ATOMKI 17 MeV pair-emission anomaly · open
Results
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