Physics Letters B (Jul 2015)

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

  • A. Anastasi,
  • D. Babusci,
  • G. Bencivenni,
  • M. Berlowski,
  • C. Bloise,
  • F. Bossi,
  • P. Branchini,
  • A. Budano,
  • L. Caldeira Balkeståhl,
  • 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

DOI
https://doi.org/10.1016/j.physletb.2015.06.015
Journal volume & issue
Vol. 747, no. C
pp. 365 – 372

Abstract

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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 DAΦNE. 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 2mμ<mU<1000 MeV, mh′<mU.

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