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Search for a Dark Photon in e+e− Collisions at BaBar

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Dark sectors charged under a new Abelian interaction 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−→γA′, A′→e+e−, μ+μ− using 514  fb−1 of data collected with the BABAR detector. We observe no statistically significant deviations from the standard model predictions, 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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GRAUGÉS POUS, Eugeni, BABAR Collaboration. Search for a Dark Photon in e+e− Collisions at BaBar. _Physical Review Letters_. 2014. Vol. 113, núm. 20, pàgs. 201801. [consulta: 25 de febrer de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/133066]

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