Search for a New Gauge Boson in Electron-Nucleus Fixed-Target Scattering by the APEX Experiment
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Abrahamyan-2011-Letters-Search for a New Gauge Boson.pdf
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Author(s)
Sulkosky, Vincent
Kelleher, Aidan Michael
Huang, J.
Abrahamyan, S.
Ahmed, Z.
Allada, Kalyan C.
Anez, D.
Averett, T.
Barbieri, A.
Bartlett, K.
Date Issued
November 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Abrahamyan, S. et al. “Search for a New Gauge Boson in Electron-Nucleus Fixed-Target Scattering by the APEX Experiment.” Physical Review Letters 107.19 (2011). © 2011 American Physical Society
Version
Final published version
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[superscript +]e[superscript -] 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[superscript +]e[superscript -] reaction, and set an upper limit of α′/α≃10[superscript -6]. Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.191804
