A sample of 1.69 *10^7 fully reconstructed π0→γe+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 π0→γA 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 mAand mixing parameter ε^2 is established. The obtained upper limits on ε^2 are more stringent than the previous limits in the mass range 9MeV/c^2<mA<70MeV/c^2. The NA48/2 sensitivity to the dark photon production in the K±→π±A decay is also evaluated.
Search for the dark photon in pi0 decays / Batley J.R.; Kalmus G.; Lazzeroni C.; Munday D.J.; Slater M.W.; Wotton S.A.; Arcidiacono R.; Bocquet G.; Cabibbo N.; Ceccucci A.; Cundy D.; Falaleev V.; Fidecaro M.; Gatignon L.; Gonidec A.; Kubischta W.; Norton A.; Maier A.; Patel M.; Peters A.; Balev S.; Frabetti P.L.; Gersabeck E.; Goudzovski E.; Hristov P.; Kekelidze V.; Kozhuharov V.; Litov L.; Madigozhin D.; Molokanova N.; Polenkevich I.; Potrebenikov Y.; Stoynev S.; Zinchenko A.; Monnier E.; Swallow E.; Winston R.; Rubin P.; Walker A.; Baldini W.; Cotta Ramusino A.; Dalpiaz P.; Damiani C.; Fiorini M.; Gianoli A.; Martini M.; Petrucci F.; Savrié M.; Scarpa M.; Wahl H.; Bizzeti A.; Lenti M.; Veltri M.; Calvetti M.; Celeghini E.; Iacopini E.; Ruggier G.; Behler M.; Eppard K.; Kleinknecht K.; Marouelli P.; Masetti L.; Moosbrugger U.; Morales M.C.; Renk B.; Wache M.; Wanke R.; Winhart A.; Coward D.; Dabrowski A.; Fonseca Martin T.; Shieh M.; Szleper M.; Velasco M.; Wood M.D.; Cenci P.; Pepe M.; Petrucci M.C.; Anzivino G.; Imbergamo E.; Nappi A.; Piccini M.; Raggi M.; Valdata-Nappi M.; Cerri C.; Fantechi R.; Collazuo G.; DiLella L.; Lamanna G.; Mannelli I.; Michetti A.; Costantini F.; Doble N.; Fiorini L.; Giudici; S.; Pierazzini; G.; Sozzi; M.; Venditti; S.; Bloch-Devaux; B.; Cheshkov; C.; Chèze; J.B.; DeBeer; M.; Derré J.; Marel G.; Mazzucato E.; Peyaud B.; Vallage B.; Holder M.; Ziolkowski M.; Biino C.; Cartiglia N.; Marchetto F.; Bifani S.; Clemencic M.; GoyLopez S.; Dibon H.; Jeitler M.; Markytan M.; Mikulec I.; Neuhofer G.; Widhalm L.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 746:(2015), pp. 178-185. [10.1016/j.physletb.2015.04.068]
Search for the dark photon in pi0 decays
Lenti M.;CALVETTI, MARIO;CELEGHINI, ENRICO;IACOPINI, ENRICO;
2015
Abstract
A sample of 1.69 *10^7 fully reconstructed π0→γe+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 π0→γA 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 mAand mixing parameter ε^2 is established. The obtained upper limits on ε^2 are more stringent than the previous limits in the mass range 9MeV/c^2File | Dimensione | Formato | |
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