Search for invisible decays of a dark photon produced in e+e- collisions at BaBar

Abstract : We search for single-photon events in 53 fb^-1 of e+e- collision data collected with the BaBar detector at the PEP-II B-factory. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle A' through the process e+e->gamma A', A'->invisible. Such particles, referred to as "dark photons", are motivated by theories applying a U(1) gauge symmetry to dark matter. We find no evidence for such processes and set 90% confidence level upper limits on the coupling strength of A' to e+e- in the mass range m_A'<=8 GeV. In particular, our limits exclude the values of the A' coupling suggested by the dark-photon interpretation of the muon (g-2) anomaly, as well as a broad range of parameters for the dark-sector models.
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http://hal.in2p3.fr/in2p3-01467101
Contributor : Claudine Bombar <>
Submitted on : Tuesday, February 14, 2017 - 10:12:30 AM
Last modification on : Thursday, January 11, 2018 - 6:13:33 AM

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  • HAL Id : in2p3-01467101, version 1
  • ARXIV : 1702.03327

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J.-P. Lees, V. Poireau, V. Tisserand. Search for invisible decays of a dark photon produced in e+e- collisions at BaBar. 2017. ⟨in2p3-01467101⟩

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