Schematic representation of a rare η meson decay process coupled with dark photon intermediate state. (IMAGE)
Caption
The η → e⁺e⁻γ decay channel holds particular significance for dark sector searches, as it provides sensitivity to dark photons and light protophobic X17 bosons that decay into electron-positron pairs. As the most studied dark-sector portal particle, the dark photon could establish a feeble connection between the Standard Model sector and potential hidden sectors.
Credit
Rong Wang
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CC BY-NC