Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muon g−2 Anomaly

Merkel, H. and Achenbach, P. and Ayerbe Gayoso, C. and Beranek, T. and Beričič, J. and Bernauer, J. C. and Bohm, R. and Bosnar, Damir and Correa, L. and Debenjak, L. and Denig, A. and Distler, M. O. and Esser, A. and Fonvieille, H. and Friščić, Ivica and Gomez Rodriguez de la Paz, M. and Hoek, M. and Kegel, S. and Kohl, Y. and Middleton, D. G. and Mihovilovč, M. and Muller, U. and Nungesser, L. and Pochodzalla, J. and Rohrbeck, M. and Ron, G. and Sanchez Majos, S. and Schlimme, B. S. and Schoth, M. and Schulz, F. and Sfienti, C. and Širca, S. and Thiel, M. and Tyukin, A. and Weber, A. and Weinriefer, M. (A1 Collaboration) (2014) Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muon g−2 Anomaly. Physical Review Letters, 112 (22). pp. 221802-5. ISSN 0031-9007

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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 40  MeV/c^2 to 300  MeV/c^2, with a sensitivity in the squared mixing parameter of as little as ε^2=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.

Item Type: Article
Date: June 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jul 2014 11:11
Last Modified: 29 Aug 2014 12:43

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