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Search for dark photons from neutral meson decays in $p$$+$$p$ and $d$$+$Au collisions at $\sqrt{s_{_{NN}}}$=200 GeV
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arxiv 1409.0851 v3 pith:DJMQALGB submitted 2014-09-02 nucl-ex
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abstract
The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment $(g-2)_\mu$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0,\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $\mathcal{O}(2\times10^{-6})$ on $U$-$\gamma$ mixing at 90% CL for the mass range $30<m_U<90$ MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the $(g-2)_\mu$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of $29<m_U<32$ MeV/$c^2$ remaining.
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Simulation of dark photon sensitivity in $\eta \rightarrow \gamma e^+e^-$ at HIAF
hep-ex 2025-06 conditional novelty 4.0 of 10
Simulations of a proposed HIAF eta factory project a dark photon branching ratio limit of 10^-6 to 10^-7 and a kinetic mixing sensitivity of epsilon^2 about 10^-7 for masses up to 0.4 GeV.
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