| Literature DB >> 24949757 |
H Merkel1, P Achenbach1, C Ayerbe Gayoso1, T Beranek1, J Beričič2, J C Bernauer1, R Böhm1, D Bosnar3, L Correa1, L Debenjak2, A Denig1, M O Distler1, A Esser1, H Fonvieille4, I Friščić3, M Gómez Rodríguez de la Paz1, M Hoek1, S Kegel1, Y Kohl1, D G Middleton1, M Mihovilovič1, U Müller1, L Nungesser1, J Pochodzalla1, M Rohrbeck1, G Ron5, S Sánchez Majos1, B S Schlimme1, M Schoth1, F Schulz1, C Sfienti1, S Sirca6, M Thiel1, A Tyukin1, A Weber1, M Weinriefer1.
Abstract
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.Entities:
Year: 2014 PMID： 24949757 DOI： 10.1103/PhysRevLett.112.221802
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161