Search for dark Higgsstrahlung in e+e−→μ+μ− and missing energy events with the KLOE experiment

• DOI: 10.1016/j.physletb.2015.06.015
• Publication Date: 2015-06-13T10:17:57Z
• Authors: A. Anastasi; D. Babusci; G. Bencivenni; M. Berlowski; C. Bloise; F. Bossi; P. Branchini; A. Budano; L. Caldeira Balke...; B. Cao; F. Ceradini; P. Ciambrone; F. Curciarello; E. Czerwiński; G. D'Agostini; E. Danè; V. De Leo; E. De Lucia; A. De Santis; P. De Simone; A. Di Cicco; A. Di Domenico; R. Di Salvo; D. Domenici; A. D'Uffizi; A. Fantini; G. Felici; S. Fiore; A. Gajos; P. Gauzzi; G. Giardina; S. Giovannella; E. Graziani; F. Happacher; L. Heijkenskjöld; W. Ikegami Andersson; T. Johansson; D. Kamińska; W. Krzemien; A. Kupsc; S. Loffredo; G. Mandaglio; M. Martini; M. Mascolo; R. Messi; S. Miscetti; G. Morello; D. Moricciani; P. Moskal; F. Nguyen; A. Palladino; A. Passeri; V. Patera; E. Perez del Rio; A. Ranieri; P. Santangelo; I. Sarra; M. Schioppa; M. Silarski; F. Sirghi; L. Tortora; G. Venanzoni; W. Wiślicki; M. Wolke
• Keywords: Dark forces; Nuclear and High Energy Physics; Dark matter, Dark photon, electron positron collider, KLOE experiment; Physics; QC1-999; Upper limit; FOS: Physical sciences; U boson; dark force; High Energy Physics - Experiment; High Energy Physics - Experiment; 01 natural sciences; dark matter; Settore FIS/01 - FISICA SPERIMENTALE; High Energy Physics - Experiment; High Energy Physics - Experiment (hep-ex); dark matter; dark forces; U boson; upper limit; Higgsstrahlung; 0103 physical sciences; Dark matter; Higgsstrahlung; upper limit

16 pages, 7 figures, submitted to Physics Letters B<br/>We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DAFNE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m_mu<br/>