Search at the Mainz microtron for light massive gauge bosons relevant for the muon g-2 Anomaly

H. Merkel*, P. Achenbach, C. Ayerbe Gayoso, T. Beranek, J. Beri, J. C. Bernauer, R. Böhm, D. Bosnar, L. Correa, L. Debenjak, A. Denig, M. O. Distler, A. Esser, H. Fonvieille, I. Friš, M. Gómez Rodríguez De La Paz, M. Hoek, S. Kegel, Y. Kohl, D. G. MiddletonM. Mihovilovic, U. Müller, L. Nungesser, J. Pochodzalla, M. Rohrbeck, G. Ron, S. Sánchez Majos, B. S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, S. Širca, M. Thiel, A. Tyukin, A. Weber, M. Weinriefer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

173 Scopus citations


A massive, but light, Abelian U(1) gauge boson is a well-motivated possible signature of physics beyond the standard model of particle physics. In this Letter, the search for the signal of such a U(1) gauge boson in electron-positron pair production at the spectrometer setup of the A1 Collaboration at the Mainz Microtron is described. Exclusion limits in the mass range of 40MeV/c2 to 300MeV/c2, with a sensitivity in the squared mixing parameter of as little as μ2=8×10-7 are presented. A large fraction of the parameter space has been excluded where the discrepancy of the measured anomalous magnetic moment of the muon with theory might be explained by an additional U(1) gauge boson.

Original languageAmerican English
Article number221802
JournalPhysical Review Letters
Issue number22
StatePublished - 4 Jun 2014


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