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Published November 14, 2014 | Supplemental Material + Published + Submitted
Journal Article Open

Search for a Dark Photon in e^+e^− Collisions at BABAR


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 e6+e6−→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.

Additional Information

© 2014 American Physical Society. Received 12 June 2014; revised manuscript received 15 September 2014; published 10 November 2014. The authors wish to thank Rouven Essig and Sarah Andreas for providing the constraints derived from existing experiments. We also thank Rouven Essig, Philip Schuster, and Natalia Toro for useful discussions and for providing us with their MADGRAPH code to simulate dark photon processes. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II2 colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (U.S.), and the Binational Science Foundation (U.S.-Israel).

Attached Files

Published - PhysRevLett.113.201801.pdf

Submitted - 1406.2980v2.pdf

Supplemental Material - paperpdfsupp.pdf


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