Search for a new gauge boson in the $A'$ Experiment (APEX)

Details Search for a new gauge boson in the $A'$ Experiment (APEX) Search for a new gauge boson in the $A'$ Experiment (APEX)

2011-08-13

arxiv.org/abs/1108.2750v2

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 figures, references added

Scientific paper

We present a search at Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling $\alpha'$ 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 $A'\to e^+e^-$ reaction, and set an upper limit of $\alpha'/\alpha \simeq 10^{-6}$. Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.

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