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Search for a dark photon in e+e- collisions at BABAR

Abstract : Dark sectors charged under a new Abelian force have recently received much attention in the context of dark matter models. These models introduce a light new mediator, the so-called dark photon (A'), connecting the dark sector to the Standard Model. We present a search for a dark photon in the reaction e+e- -> gamma A', A'-> e+e-, mu+mu- using 514 fb-1 of data collected with the BABAR detector. We do not observe a significant signal and we set 90% confidence level upper limits on the mixing strength between the photon and dark photon at the level of 10^-4 - 10^-3 for dark photon masses in the range 0.02 - 10.2 GeV. We further constrain the range of the parameter space favored by interpretations of the discrepancy between the calculated and measured anomalous magnetic moment of the muon.
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Submitted on : Thursday, June 12, 2014 - 10:08:59 AM
Last modification on : Tuesday, January 25, 2022 - 12:48:11 PM

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J.P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Search for a dark photon in e+e- collisions at BABAR. Physical Review Letters, American Physical Society, 2014, 113, pp.201801. ⟨10.1103/PhysRevLett.113.201801⟩. ⟨in2p3-01005163⟩



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