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 Aâ² through the process e+e-âγAâ²; Aâ²âinvisible. 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 Aâ² to e+e- in the mass range mAâ²â¤8 GeV. In particular, our limits exclude the values of the Aâ² 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.
Search for Invisible Decays of a Dark Photon Produced in e+e- Collisions at B a B ar
Batignani, G.;Bettarini, S.;Casarosa, G.Membro del Collaboration Group
;Forti, F.;Giorgi, M. A.;Paoloni, E.;Rizzo, G.;Lueck, T.;
2017-01-01
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 Aâ² through the process e+e-âγAâ²; Aâ²âinvisible. 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 Aâ² to e+e- in the mass range mAâ²â¤8 GeV. In particular, our limits exclude the values of the Aâ² 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.File | Dimensione | Formato | |
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PhysRevLett.119.131804.pdf
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