Physics Letters B (Sep 2014)

Search for light vector boson production in e+e−→μ+μ−γ interactions with the KLOE experiment

  • D. Babusci,
  • I. Balwierz-Pytko,
  • G. Bencivenni,
  • C. Bloise,
  • F. Bossi,
  • P. Branchini,
  • A. Budano,
  • L. Caldeira Balkeståhl,
  • 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

DOI
https://doi.org/10.1016/j.physletb.2014.08.005
Journal volume & issue
Vol. 736, no. C
pp. 459 – 464

Abstract

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We 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.

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