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arXiv:1406.2980 [hep-ex]AbstractReferencesReviewsResources

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

The BABAR Collaboration

Published 2014-06-11, updated 2014-09-18Version 2

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.

Comments: 7 pages, 7 figures, to appear in PRL, published version
Categories: hep-ex
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