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Search for dark Higgsstrahlung in e+ e- -> mu+ mu- and missing energy events with the KLOE experiment

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arxiv 1501.06795 v1 pith:OM7T6W6O submitted 2015-01-27 hep-ex

KLOE-2 Collaboration: D. Babusci , G. Bencivenni , C. Bloise , F. Bossi , P. Branchini , A. Budano , L. Caldeira Balkestahl , F. Ceradini
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P. Ciambrone F. Curciarello E. Czerwinski E. Dane' V. De Leo E. De Lucia A. De Santis P. De Simone A. Di Cicco A. Di Domenico R. Di Salvo D. Domenici A. Fantini G. Felici S. Fiore A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskjold W. Ikegami Andersson T. Johansson D. Kaminska 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 A. Ranieri P. Santangelo I. Sarra M. Schioppa M. Silarski L. Tortora G. Venanzoni W. Wislicki M. Wolke
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classification hep-ex
keywords darkenergyevidencehiggsstrahlungkloemissingprocessboson
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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<m_U<1000 MeV, m_h'<m_U.

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