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)mu 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 BaBar
Calabrese, R.;Garzia, I.;Luppi, E.;
2017
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)mu 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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PhysRevLett.119.131804-accepted.pdf
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