{"paper":{"title":"Search for light massive gauge bosons as an explanation of the $(g-2)_\\mu$ anomaly at MAMI","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"A. Denig, A. Esser, A. Tyukin, A. Weber, B. S. Schlimme, C. Ayerbe Gayoso, C. Sfienti, D. Bosnar, D. G. Middleton, F. Schulz, G. Ron, H. Fonvieille, H. Merkel, I. Fri\\v{s}\\v{c}i\\'c, J. Beri\\v{c}i\\v{c}, J. C. Bernauer, J. Pochodzalla, L. Correa, L. Debenjak, L. Nungesser, M. G\\'omez Rodr\\'iguez de la Paz, M. Hoek, M. Mihovilovi\\v{c}, M. O. Distler, M. Rohrbeck, M. Schoth, M. Thiel, M. Weinriefer, P. Achenbach, R. B\\\"ohm, S. Kegel, S. S\\'anchez Majos, S. \\v{S}irca, T. Beranek, U. M\\\"uller, Y. Kohl","submitted_at":"2014-04-22T14:01:28Z","abstract_excerpt":"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 ano"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.5502","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}