Higher-order electromagnetic and hadronic contributions to dark photon bremsstrahlung have limited impact on signal and background predictions for LDMX and LOHENGRIN except for requiring an HCAL extension in LOHENGRIN to veto diffractive backgrounds.
Search for the dark photon in $\pi^0$ decays
7 Pith papers cite this work. Polarity classification is still indexing.
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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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A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.
Reactor neutrino data from CONUS+ and Dresden-II combined with COHERENT and IceCube data singles out a region of neutrino and nuclear couplings consistent with the X17 particle.
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.
A parameter space analysis of a leptophilic scalar mediator model for Majorana dark matter yields a viable sub-GeV region after applying relic density, cosmological, astrophysical, and laboratory constraints.
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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Theory Calculations for LDMX and LOHENGRIN beyond Coherent Bethe-Heitler Scattering
Higher-order electromagnetic and hadronic contributions to dark photon bremsstrahlung have limited impact on signal and background predictions for LDMX and LOHENGRIN except for requiring an HCAL extension in LOHENGRIN to veto diffractive backgrounds.
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Flavor specific chiral $U(1)_X$ framework for explaining the ATOMKI anomaly
A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.
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The X17 Existence Hinted at by Nuclear Reactor Neutrinos
Reactor neutrino data from CONUS+ and Dresden-II combined with COHERENT and IceCube data singles out a region of neutrino and nuclear couplings consistent with the X17 particle.
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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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Constraints on a Light Leptophilic Scalar from Dark-Sector Couplings
A parameter space analysis of a leptophilic scalar mediator model for Majorana dark matter yields a viable sub-GeV region after applying relic density, cosmological, astrophysical, and laboratory constraints.
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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.