A chiral flavor-specific U(1)_X model with two Higgs doublets accommodates the ATOMKI 17 MeV anomaly via a Z' boson whose parameter space remains consistent with atomic parity violation, beam dump, meson decay, and neutrino scattering bounds.
Measurement of the Decay π+ →e +νee+e− and Search for a Light Higgs Boson
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abstract
A sample of $1.69\times 10^7$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in 2003--2004 is analysed to search for the dark photon ($A'$) production in the $\pi^0\to\gamma A'$ decay followed by the prompt $A'\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\varepsilon^2$ is established. The obtained upper limits on $\varepsilon^2$ are more stringent than the previous limits in the mass range $9~{\rm MeV}/c^2<m_{A'}<70~{\rm MeV}/c^2$. The NA48/2 sensitivity to the dark photon production in the $K^\pm\to\pi^\pm A'$ decay is also evaluated.
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Fitting independent quark couplings of the X17 boson to D, psi(2S), and phi decay data yields |ε_c| = 7.6×10^{-3}, |ε_s| = 2.4×10^{-3}, a huge |ε_u| in tension with ATOMKI, and a predicted range for the D^{*+} → D^{+} e⁺e⁻ rate.
LDMX can close much of the sub-100 MeV blind spot for axions and dark photons via charged track and momentum reconstruction.
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.
citing papers explorer
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A Flavor Specific Chiral $U(1)_X$ Framework for Explaining the ATOMKI Anomaly
A chiral flavor-specific U(1)_X model with two Higgs doublets accommodates the ATOMKI 17 MeV anomaly via a Z' boson whose parameter space remains consistent with atomic parity violation, beam dump, meson decay, and neutrino scattering bounds.
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Testing the hypothesis of vector X17 boson by D meson, Charmonium, and $\phi$ meson decays
Fitting independent quark couplings of the X17 boson to D, psi(2S), and phi decay data yields |ε_c| = 7.6×10^{-3}, |ε_s| = 2.4×10^{-3}, a huge |ε_u| in tension with ATOMKI, and a predicted range for the D^{*+} → D^{+} e⁺e⁻ rate.
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Cornering MeV-GeV Axions and Dark Photons with LDMX
LDMX can close much of the sub-100 MeV blind spot for axions and dark photons via charged track and momentum reconstruction.
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The Dark Photon
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.