A sample of 1.69 ×107fully reconstructed π0→γe+e−decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzedto search for the dark photon (A) production in the π0→γAdecay 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 ε2is established. The obtained upper limits on ε2are more stringent than the previous limits in the mass range 9MeV/c2<70MeV/c2. The NA48/2 sensitivity to the dark photon production in the K±→π±Adecay is also evaluated.
Search for the dark photon in π0 decays / Batley, J. R; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, Nicola; 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. u.; 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, Morales; 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, Mauro; 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. - 746:(2015), pp. 178-185. [10.1016/j.physletb.2015.04.068]
Search for the dark photon in π0 decays
CABIBBO, Nicola;RAGGI, MAURO;
2015
Abstract
A sample of 1.69 ×107fully reconstructed π0→γe+e−decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzedto search for the dark photon (A) production in the π0→γAdecay 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 ε2is established. The obtained upper limits on ε2are more stringent than the previous limits in the mass range 9MeV/c2<70MeV/c2. The NA48/2 sensitivity to the dark photon production in the K±→π±Adecay is also evaluated.File | Dimensione | Formato | |
---|---|---|---|
Batley_Search for the dark photon_2015.pdf
accesso aperto
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Creative commons
Dimensione
487.73 kB
Formato
Adobe PDF
|
487.73 kB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.