Rare charm hadron decays offer clean null tests of the standard model that can reach branching ratios up to 10^{-3} for dark photons and 10^{-4} for ALPs in unconstrained parameter spaces.
Seeking massless dark photons in the decays of charmed hadrons
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Modified pQCD with transverse momenta and Sudakov suppression yields form factors for B→ρ(ω)γ that match LCSR after fitting soft components to data, then bounds B→ρ(ω)γ' branching ratios for a dark photon.
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-charged fermion constraints.