Limit on the production of a light vector gauge boson in ϕ meson decays with the KLOE detector

• DOI: 10.1016/j.physletb.2013.01.067
• Publication Date: 2013-02-06T13:18:22Z
• Authors: D. Babusci; D. Badoni; I. Balwierz-Pytko; G. Bencivenni; C. Bini; C. Bloise; F. Bossi; P. Branchini; A. Budano; L. Caldeira Balke...; G. Capon; F. Ceradini; P. Ciambrone; E. Czerwiński; E. Danè; E. De Lucia; G. De Robertis; A. De Santis; A. Di Domenico; C. Di Donato; R. Di Salvo; D. Domenici; O. Erriquez; G. Fanizzi; A. Fantini; G. Felici; S. Fiore; P. Franzini; P. Gauzzi; G. Giardina; S. Giovannella; F. Gonnella; E. Graziani; F. Happacher; L. Heijkenskjöld; B. Höistad; L. Iafolla; M. Jacewicz; T. Johansson; A. Kupsc; J. Lee-Franzini; B. Leverington; 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. Passeri; V. Patera; I. Prado Longhi; A. Ranieri; C.F. Redmer; P. Santangelo; I. Sarra; M. Schioppa; B. Sciascia; M. Silarski; C. Taccini; L. Tortora; G. Venanzoni; W. Wiślicki; M. Wolke; J. Zdebik
• Keywords: Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE; E+e- Collision; Nuclear and High Energy Physics; Dark forces; $e^{+}e^{-}$ collisions; −; Dark forces; E; +; e; −; Collisions; Gauge vector boson; FOS: Physical sciences; +; 01 natural sciences; Settore FIS/01 - FISICA SPERIMENTALE; e(+)e(-) Collisions, Dark forces, Gauge vector boson; High Energy Physics - Experiment; High Energy Physics - Experiment (hep-ex); E; e; Dark force; 0103 physical sciences; dark forces; gauge vector boson; Collisions; Gauge vector boson

12 pages, 7 figures, updated PLB version<br/>We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30<br/>