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. 2011 Nov 4;107(19):191804.
doi: 10.1103/PhysRevLett.107.191804. Epub 2011 Nov 4.

Search for a new gauge boson in electron-nucleus fixed-target scattering by the APEX experiment

S Abrahamyan  1 , Z Ahmed, K Allada, D Anez, T Averett, A Barbieri, K Bartlett, J Beacham, J Bono, J R Boyce, P Brindza, A Camsonne, K Cranmer, M M Dalton, C W de Jager, J Donaghy, R Essig, C Field, E Folts, A Gasparian, N Goeckner-Wald, J Gomez, M Graham, J-O Hansen, D W Higinbotham, T Holmstrom, J Huang, S Iqbal, J Jaros, E Jensen, A Kelleher, M Khandaker, J J LeRose, R Lindgren, N Liyanage, E Long, J Mammei, P Markowitz, T Maruyama, V Maxwell, S Mayilyan, J McDonald, R Michaels, K Moffeit, V Nelyubin, A Odian, M Oriunno, R Partridge, M Paolone, E Piasetzky, I Pomerantz, Y Qiang, S Riordan, Y Roblin, B Sawatzky, P Schuster, J Segal, L Selvy, A Shahinyan, R Subedi, V Sulkosky, S Stepanyan, N Toro, D Walz, B Wojtsekhowski, J Zhang
Affiliations

Search for a new gauge boson in electron-nucleus fixed-target scattering by the APEX experiment

S Abrahamyan et al. Phys Rev Lett. .

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.

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