Document Type

Article

Publication Date

11-4-2011

Abstract

We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling α to electrons. Such a particle A can be produced in electron-nucleus fixed-target scattering and then decay to an e+e- pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175–250 MeV, found no evidence for an A→e+e- reaction, and set an upper limit of α/α≃10-6. Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.

DOI

10.1103/PhysRevLett.107.191804

Version

Publisher's PDF

Comments

© 2011 American Physical Society. The original publication is available at http://link.aps.org/doi/10.1103/PhysRevLett.107.191804

Original Citation

Phys. Rev. Lett. 107, 191804 (2011)

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