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Search for a Dark Photon in Electro-Produced $e^{+}e^{-}$ Pairs with the Heavy Photon Search Experiment at JLab
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abstract
The Heavy Photon Search experiment took its first data in a 2015 engineering run at the Thomas Jefferson National Accelerator Facility, searching for a prompt, electro-produced dark photon with a mass between 19 and 81 MeV/$c^2$. A search for a resonance in the $e^{+}e^{-}$ invariant mass distribution, using 1.7 days (1170 nb$^{-1}$) of data, showed no evidence of dark photon decays above the large QED background, confirming earlier searches and demonstrating the full functionality of the experiment. Upper limits on the square of the coupling of the dark photon to the Standard Model photon are set at the level of 6$\times$10$^{-6}$. Future runs with higher luminosity will explore new territory.
Forward citations
Cited by 2 Pith papers
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Simulation of dark photon sensitivity in $\eta \rightarrow \gamma e^+e^-$ at HIAF
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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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-...
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