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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Pré-publication, Document de travail
See paper for full list of authors - 9 pages, 13 figures, submitted to Physical Review Letters. 2017
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http://hal.in2p3.fr/in2p3-01467101
Contributeur : Claudine Bombar <>
Soumis le : mardi 14 février 2017 - 10:12:30
Dernière modification le : jeudi 11 janvier 2018 - 06:13:33

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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. See paper for full list of authors - 9 pages, 13 figures, submitted to Physical Review Letters. 2017. 〈in2p3-01467101〉

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