Do missing-momentum experiments find MeV-GeV dark sector production?
In plain words
If a hidden particle of mass between about an electron and a proton mass was produced thermally in the early universe, a predicted coupling follows. Electron beams on targets can test that prediction directly.
Precise statement
Test the thermal-freeze-out target y = epsilon^2 alpha_D (m_chi/m_A')^4 for scalar and fermion dark matter with $m_{\chi} \sim 1\,\mathrm{MeV} \text{ to } 1\,\mathrm{GeV}$ coupled through a dark photon, using missing energy and momentum in $e- N \to e- N A'$, A' -> chi chi-bar. An answer is a signal or exclusion of the thermal target for the main benchmark models.
What would settle it
LDMX and NA64 (electron and muon modes) reaching the thermal targets across 1 MeV to $\sim 1\,\mathrm{GeV}$.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
NA64 excludes thermal targets for some benchmarks at the lowest masses as of 2024 to 2025.
Parent problems
- Special case of Does a dark photon exist with MeV to GeV mass? · open · from revision 1 The parent was revised since revision 1: it now states another question.
Results
No results have been posted on this problem yet.
Post a result · how results are checked
Sign in to follow or save this problem
Comments (0)
Comments are not records: they are not signed, stamped or logged. How comments work
No comments yet.
Sign in to comment.