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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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arxiv 1807.11530 v2 pith:I27E6DFC submitted 2018-07-30 hep-ex hep-ph

Search for a Dark Photon in Electro-Produced e⁺e⁻ Pairs with the Heavy Photon Search Experiment at JLab

classification hep-ex hep-ph
keywords photondarksearchexperimentdataelectro-producedheavymass
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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  1. The Dark Photon

    hep-ph 2020-05 unverdicted novelty 2.0

    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-...