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Search for Invisible Decays of a Dark Photon Produced in e+e Collisions at BaBar

J. P. Lees et al. (BaBar Collaboration)
Phys. Rev. Lett. 119, 131804 – Published 28 September 2017
Physics logo See Synopsis: Dark Photon Conjecture Fizzles
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Abstract

We search for single-photon events in 53fb1 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+eγA; Ainvisible. 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 mA8GeV. In particular, our limits exclude the values of the A coupling suggested by the dark-photon interpretation of the muon (g2)μ anomaly, as well as a broad range of parameters for the dark-sector models.

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  • Received 14 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.131804

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

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Dark Photon Conjecture Fizzles

Published 28 September 2017

The lack of so-called “dark photons” in electron-positron collision data rules out scenarios in which these hypothetical particles explain the muon’s magnetic moment.

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Vol. 119, Iss. 13 — 29 September 2017

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