Searching for Prompt and Long-Lived Dark Photons in Electro-Produced $e^{+}{e}^{-}$ Pairs with the Heavy Photon Search Experiment at JLab

Abstract

The Heavy Photon Search experiment (HPS) at the Thomas Jefferson National Accelerator Facility searches for electro-produced dark photons. We report results from the 2016 Engineering Run consisting of 10608/nb of data for both the prompt and displaced vertex searches. A search for a prompt resonance in the $e^{+}{e}^{-}$ invariant mass distribution between 39 and 179 MeV showed no evidence of dark photons above the large QED background, limiting the coupling of ε^2 {\geq} 10^-5, in agreement with previous searches. The search for displaced vertices showed no evidence of excess signal over background in the masses between 60 and 150 MeV, but had insufficient luminosity to limit canonical heavy photon production. This is the first displaced vertex search result published by HPS. HPS has taken high-luminosity data runs in 2019 and 2021 that will explore new dark photon phase space.

28 pages, 46 figures

References in corpus (14)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• A Theory of Dark Matter
• Secluded U(1) below the weak scale
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• New determination of the fine structure constant and test of the quantum electrodynamics
• Non-Abelian Dark Sectors and Their Collider Signatures
• New Limits on Hidden Photons from Past Electron Beam Dumps
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Probing Dark Forces and Light Hidden Sectors at Low-Energy e+e- Colliders
• Search for light massive gauge bosons as an explanation of the $(g-2{)}_{\mu }$ anomaly at MAMI
• Kinetic Mixing as the Origin of Light Dark Scales
• Constraints on sub-GeV hidden sector gauge bosons from a search for heavy neutrino decays
• Combined search for the Standard Model Higgs boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The Heavy Photon Search Test Detector

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