Search for Invisible Decays of a Dark Photon Produced in e+e- Collisions at B a B ar

<i>B<span class="sc">a</span>B<span class="sc">ar</span></i> Collaboration

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124 Citations (Scopus)

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-→γA′; 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 mA′≤8 GeV. In particular, our limits exclude the values of the A′ coupling suggested by the dark-photon interpretation of the muon (g-2)μ anomaly, as well as a broad range of parameters for the dark-sector models.

Original languageEnglish
Article number131804
Number of pages7
JournalPhysical Review Letters
Volume119
Issue number13
DOIs
Publication statusPublished - 28 Sep 2017

Keywords

  • KEV LINE EMISSION
  • QUADRANT
  • DETECTOR
  • LIMITS
  • PI(0)
  • BOSON

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