Search for Invisible Decays of a Dark Photon Produced in e⁺e⁻ Collisions at BaBar
Name
PhysRevLett.119.131804.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Brown, D. N.
Derdzinski, M.
Giuffrida, A.
Kolomensky, Yu. G.
Date Issued
September 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lees, J. P. et al. "Search for Invisible Decays of a Dark Photon Produced in e⁺e⁻ Collisions at BaBar." Physical Review Letters 119, 13 (September 2017): 131804 © 2017 American Physical Society
Version
Final published version
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 m[subscript 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)[subscript μ] anomaly, as well as a broad range of parameters for the dark-sector models.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.119.131804
