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Search for light massive gauge bosons as an explanation of the (g-2)_μ anomaly at MAMI

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arxiv 1404.5502 v1 pith:GDJBTBM3 submitted 2014-04-22 hep-ex nucl-ex

Search for light massive gauge bosons as an explanation of the (g-2)_μ anomaly at MAMI

H. Merkel , P. Achenbach , C. Ayerbe Gayoso , T. Beranek , J. Beri\v{c}i\v{c} , J. C. Bernauer , R. B\"ohm , D. Bosnar
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L. Correa L. Debenjak A. Denig M. O. Distler A. Esser H. Fonvieille I. Fri\v{s}\v{c}i\'c M. G\'omez Rodr\'iguez de la Paz M. Hoek S. Kegel Y. Kohl D. G. Middleton M. Mihovilovi\v{c} U. M\"uller L. Nungesser J. Pochodzalla M. Rohrbeck G. Ron S. S\'anchez Majos B. S. Schlimme M. Schoth F. Schulz C. Sfienti S. \v{S}irca M. Thiel A. Tyukin A. Weber M. Weinriefer
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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 paper, 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 (MAMI) is described. Exclusion limits in the mass range of 40 MeV up to 300 MeV with a sensitivity in the mixing parameter of down to $\epsilon^2 = 8\times 10^{-7}$ 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.

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