Search for a New Gauge Boson in Electron-Nucleus Fixed-Target Scattering by the APEX Experiment
Aug, 20115 pages
Published in:
- Phys.Rev.Lett. 107 (2011) 191804
e-Print:
- 1108.2750 [hep-ex]
Report number:
- JLAB-PHY-11-1406,
- SLAC-PUB-14491
Citations per year
Abstract: (arXiv)
We present a search at Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling to electrons. Such a particle can be produced in electron-nucleus fixed-target scattering and then decay to an 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 reaction, and set an upper limit of . Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.Note:
- 5 pages, 5 figures, references added
- 14.70.Pw
- 25.30.Rw
- quantum electrodynamics
- narrow resonance
- electron: pair production
- vector boson: weak coupling
- gauge boson: search for
- electron nucleus: interaction
- tantalum
- vector boson: electroproduction
References(34)
Figures(4)
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