Search for the dark photon inπ0decays

• DOI: 10.1016/j.physletb.2015.04.068
• Publication Date: 2015-05-05T13:03:54Z
• Authors: J.R. Batley; G. Kalmus; C. Lazzeroni; D.J. Munday; M.W. Slater; S.A. Wotton; R. Arcidiacono; G. Bocquet; N. Cabibbo; A. Ceccucci; D. Cundy; V. Falaleev; M. Fidecaro; L. Gatignon; A. Gonidec; W. Kubischta; A. Norton; A. Maier; M. Patel; A. Peters; S. Balev; P.L. Frabetti; E. Gersabeck; E. Goudzovski; P. Hristov; V. Kekelidze; V. Kozhuharov; L. Litov; D. Madigozhin; N. Molokanova; I. Polenkevich; Yu. Potrebenikov; S. Stoynev; A. Zinchenko; E. Monnier; E. Swallow; R. Winston; P. Rubin; A. Walker; W. Baldini; A. Cotta Ramusino; P. Dalpiaz; C. Damiani; M. Fiorini; A. Gianoli; M. Martini; F. Petrucci; M. Savrié; M. Scarpa; H. Wahl; A. Bizzeti; M. Lenti; M. Veltri; M. Calvetti; E. Celeghini; E. Iacopini; G. Ruggiero; M. Behler; K. Eppard; K. Kleinknecht; P. Marouelli; L. Masetti; U. Moosbrugger; C. Morales Morales; B. Renk; M. Wache; R. Wanke; A. Winhart; D. Coward; A. Dabrowski; T. Fonseca Martin; M. Shieh; M. Szleper; M. Velasco; M.D. Wood; P. Cenci; M. Pepe; M.C. Petrucci; G. Anzivino; E. Imbergamo; A. Nappi; M. Piccini; M. Raggi; M. Valdata-Nappi; C. Cerri; R. Fantechi; G. Collazuol; L. DiLella; G. Lamanna; I. Mannelli; A. Michetti; F. Costantini; N. Doble; L. Fiorini; S. Giudici; G. Pierazzini; M. Sozzi; S. Venditti; B. Bloch-Devaux; C. Cheshkov; J.B. Chèze; M. De Beer; J. Derré; G. Marel; E. Mazzucato; B. Peyaud; B. Vallage; M. Holder; M. Ziolkowski; C. Biino; N. Cartiglia; F. Marchetto; S. Bifani; M. Clemencic; S. Goy Lopez; H. Dibon; M. Jeitler; M. Markytan; I. Mikulec; G. Neuhofer; L. Widhalm
• Keywords: Nuclear and High Energy Physics; QC1-999; Particles & Fields; Astronomy & Astrophysics; 530; 01 natural sciences; Physics, Particles & Fields; 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics; 0103 physical sciences; Nuclear; dark matter, meson decays; DETECTOR; Nuclear and High Energy Physics, dark photon, photon, pion, neutral pion; Science & Technology; Physics; Dark Photon; KAON DECAYS; Molecular; Nuclear & Particles Physics; Physics, Nuclear; 0202 Atomic; Particle And Plasma Physics; Physical Sciences; Fotone; High Energy Physics - Experiment; Dark Photon

A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for dark photon (A′) production π0→γA′ followed prompt A′→e+e− decay. No signal observed, and an exclusion region plane mass mA′ mixing parameter ε2 established. The obtained upper limits on are more stringent than previous range 9MeV/c2<mA′<70MeV/c2. sensitivity K±→π±A′ also evaluated.