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

J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, M. Derdzinski, A. Giuffrida, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, C. Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. DruzhininV. B. Golubev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu I. Skovpen, E. P. Solodov, K. Yu Todyshev, A. J. Lankford, J. W. Gary, O. Long, A. M. Eisner, W. S. Lockman, W. Panduro Vazquez, D. S. Chao, C. H. Cheng, B. Echenard, K. T. Flood, D. G. Hitlin, J. Kim, T. S. Miyashita, P. Ongmongkolkul, F. C. Porter, L. Sun, R. J. Barlow, G. D. Lafferty, C. P. Jessop, M. K. Sullivan, M. S. Alam, X. C. Lou, P. F. Harrison, The BaBar Collaboration

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    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
    JournalPhysical Review Letters
    Volume119
    Issue number13
    DOIs
    Publication statusPublished - 28 Sept 2017

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