Search for light vector boson production ine+e−→μ+μ−γinteractions with the KLOE experiment

• DOI: 10.1016/j.physletb.2014.08.005
• Publication Date: 2014-08-07T13:02:42Z
• Authors: D. Babusci; I. Balwierz-Pytko; G. Bencivenni; C. Bloise; F. Bossi; P. Branchini; A. Budano; L. Caldeira Balke...; F. Ceradini; P. Ciambrone; F. Curciarello; E. Czerwiński; E. Danè; V. De Leo; E. De Lucia; G. De Robertis; A. De Santis; P. De Simone; A. Di Cicco; A. Di Domenico; R. Di Salvo; D. Domenici; O. Erriquez; G. Fanizzi; A. Fantini; G. Felici; S. Fiore; P. Franzini; A. Gajos; P. Gauzzi; G. Giardina; S. Giovannella; E. Graziani; F. Happacher; L. Heijkenskjöld; B. Höistad; T. Johansson; K. Kacprzak; D. Kamińska; W. Krzemien; A. Kupsc; J. Lee-Franzini; F. Loddo; S. Loffredo; G. Mandaglio; M. Martemianov; M. Martini; M. Mascolo; R. Messi; S. Miscetti; G. Morello; D. Moricciani; P. Moskal; F. Nguyen; A. Palladino; A. Passeri; V. Patera; I. Prado Longhi; A. Ranieri; P. Santangelo; I. Sarra; M. Schioppa; B. Sciascia; M. Silarski; L. Tortora; G. Venanzoni; W. Wiślicki; M. Wolke; J. Zdebik
• Keywords: Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE; Nuclear and High Energy Physics; Dark forces; Dark forces; Dark matter; U boson; Nuclear and High Energy Physics; Physics; QC1-999; U boson; 01 natural sciences; Dark force; Physical Sciences; 0103 physical sciences; Dark matter; Fysik; Dark matter; Dark forces; U boson

AbstractWe have searched for a light vector boson U, the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE e+e− collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb−1, we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ, corresponding to the decay U→μ+μ−. We find no evidence for a U vector boson signal. We set a 90% CL upper limit for the mixing parameter squared between the photon and the U boson of 1.6×10−5 to 8.6×10−7 for the mass region 520<mU<980 MeV.