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Search for the dark photon in pi(0) decays

  • Batley JR
  • 1 Kalmus G
  • 1 Lazzeroni C
  • 1, 23 Munday DJ
  • 1 Slater MW
  • 1, 23 Wotton SA
  • 1 Arcidiacono Roberta 2
  • 24
  • 25 Bocquet G
  • 2 Cabibbo Nicola 2 Ceccucci A
  • 2 Cundy D
  • 2, 26 Falaleev V
  • 2 Fidecaro M
  • 2 Gatignon L
  • 2 Gonidec A
  • 2 Kubischta W
  • 2 Norton Alan Robert 2, 27 Maier A
  • 2 Patel M
  • 2, 28 Peters A
  • 2 Balev S
  • 3 Frabetti Pierluigi 3 Gersabeck E
  • 3, 29 Goudzovski E
  • 3, 23 Hristov P
  • 2, 3 Kekelidze V
  • 3 Kozhuharov V
  • 3, 30
  • 31 Litov L
  • 3, 30 Madigozhin D
  • 3 Molokanova N
  • 3 Polenkevich I
  • 3 Potrebenikov Y
  • 3 Stoynev S
  • 3, 32 Zinchenko A
  • 3 Monnier E
  • 4, 33 Swallow E
  • 4 Winston R
  • 4, 34 Rubin P
  • 5, 35 Walker A
  • 5 Baldini Wander 6
  • 7 Cotta Ramusino Angelo 6
  • 7 Dalpiaz Pietro 6
  • 7 Damiani Chiara 6
  • 7 Fiorini Massimiliano 6
  • 7 Gianoli Alberto 6
  • 7 Martini Mara 6
  • 7 Petrucci Ferruccio 6
  • 7 Savrie' Mauro 6
  • 7 Scarpa Marcella 6
  • 7 Wahl Heinrich
  • Bizzeti Andrea
  • Lenti Massimo
  • Calvetti Mario 9 Celeghini Enrico 9 Iacopini Enrico 9 Ruggiero Giuseppe 2, 9 Behler M
  • 10 Eppard K
  • 10 Kleinknecht K
  • 10 Marouelli P
  • 10 Masetti L
  • 10 Moosbrugger U
  • 10 Morales CM
  • 10 Renk B
  • 10 Wache M
  • 10 Wanke R
  • 10 Winhart A
  • 10 Coward D
  • 11, 37 Dabrowski A
  • 11 Martin TF
  • 11 Shieh M
  • 11 Szleper M
  • 11 Velasco M
  • 11 Wood MD
  • 11, 37 Cenci Patrizia 12 Pepe Monica 12 Petrucci Maria Carmela 12 Anzivino Giuseppina 13 Imbergamo Ermanno 13 Nappi Aniello 13 Piccini Mauro 13 Raggi Mauro 13 Valdata Nappi M
  • 13 Cerri Claudio 14 Fantechi Riccardo 14 Collazuol Gianmaria 15
  • 16
  • 38 DiLella L
  • 15
  • 16 Lamanna Gianluca 15
  • 16
  • 31 Mannelli Italo 15
  • 16 Michetti Andrea 15
  • 16 Costantini Flavio 17 Doble N
  • 17 Fiorini Luca 17
  • 39 Giudici Sergio 17 Pierazzini Giuseppe 17 Sozzi Marco 17 Venditti Stefano 17 Bloch Devaux Brigitte 18
  • 40 Cheshkov C
  • 18, 41 Cheze JB
  • 18 De Beer M
  • 18 Derre J
  • 18 Marel G
  • 18 Mazzucato E
  • 18 Peyaud B
  • 18 Vallage B
  • 18 Holder M
  • 19 Ziolkowski M
  • 19 Biino Cristina 20 Cartiglia Nicolo' 20 Marchetto Flavio Pietro 20 Bifani Simone 21
  • 23 Clemencic Marco 2
  • 21 Goy Lopez Silvia 21
  • 42 Dibon H
  • 22 Jeitler M
  • 22 Markytan M
  • 22 Mikulec I
  • 22 Neuhofer G
  • 22 Widhalm L.
  • VELTRI, MICHELE
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Publication date
January 2015
Icon DOI
10.1016/j.physletb.2015.04.068

Abstract

A sample of 1.69 x 10(7) fully reconstructed pi(0) -> gamma e(+)e(-) decay candidates collected by the NA48/2 experiment at CERN in 2003-2004 is analyzed to search for the dark photon (A') production in the pi(0) -> gamma A' decay followed by the prompt A' -> e(+)e(-) decay. No signal is observed, and an exclusion region in the plane of the dark photon mass m(A') and mixing parameter epsilon(2) is established. The obtained upper limits on epsilon(2) are more stringent than the previous limits in the mass range 9 MeV/c(2) pi(+/-)A' decay is also evaluated. (C) 2015 The Authors. Published by Elsevier B.V

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