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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A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.
The complex e+e- invariant mass spectrum below 50 MeV is attributed to thermal annihilation and bound states of QED-deconfined and confined neutral q bar q quark matter.
The authors combine PADME positron annihilation data with nuclear transition results to report a refined mass for the hypothetical X17 boson of 16.88 ± 0.05 MeV.
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.
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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Axion-Like Electrophilic Portal for Pion Dark Matter
A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.
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Possible Evidence for Neutral Color-Singlet $q\bar q$ Quark Matter from High-Energy Pb-Emulsion Collisions
The complex e+e- invariant mass spectrum below 50 MeV is attributed to thermal annihilation and bound states of QED-deconfined and confined neutral q bar q quark matter.
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Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation
The authors combine PADME positron annihilation data with nuclear transition results to report a refined mass for the hypothetical X17 boson of 16.88 ± 0.05 MeV.
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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.