Search for Invisible Decays of a Dark Photon Produced in e^{+}e^{-} Collisions at BaBar.
J P Lees, V Poireau, V Tisserand, E Grauges, A Palano, G Eigen, D N Brown, M Derdzinski, A Giuffrida, Yu G Kolomensky, M Fritsch, H Koch, T Schroeder, C Hearty, T S Mattison, J A McKenna, R Y So, V E Blinov, A R Buzykaev, V P Druzhinin, V B Golubev, E A Kravchenko, A P Onuchin, S I Serednyakov, Yu I Skovpen, E P Solodov, K Yu Todyshev, A J Lankford, J W Gary, O Long, A M Eisner, W S Lockman, W Panduro Vazquez, D S Chao, C H Cheng, B Echenard, K T Flood, D G Hitlin, J Kim, T S Miyashita, P Ongmongkolkul, F C Porter, M Röhrken, Z Huard, B T Meadows, B G Pushpawela, M D Sokoloff, L Sun, J G Smith, S R Wagner, D Bernard, M Verderi, D Bettoni, C Bozzi, R Calabrese, G Cibinetto, E Fioravanti, I Garzia, E Luppi, V Santoro, A Calcaterra, R de Sangro, G Finocchiaro, S Martellotti, P Patteri, I M Peruzzi, M Piccolo, M Rotondo, A Zallo, S Passaggio, C Patrignani, H M Lacker, B Bhuyan, U Mallik, C Chen, J Cochran, S Prell, H Ahmed, A V Gritsan, N Arnaud, M Davier, F Le Diberder, A M Lutz, G Wormser, D J Lange, D M Wright, J P Coleman, E Gabathuler, D E Hutchcroft, D J Payne, C Touramanis, A J Bevan, F Di Lodovico, R Sacco, G Cowan, Sw Banerjee, D N Brown, C L Davis, A G Denig, W Gradl, K Griessinger, A Hafner, K R Schubert, R J Barlow, G D Lafferty, R Cenci, A Jawahery, D A Roberts, R Cowan, S H Robertson, B Dey, N Neri, F Palombo, R Cheaib, L Cremaldi, R Godang, D J Summers, P Taras, G De Nardo, C Sciacca, G Raven, C P Jessop, J M LoSecco, K Honscheid, R Kass, A Gaz, M Margoni, M Posocco, G Simi, F Simonetto, R Stroili, S Akar, E Ben-Haim, M Bomben, G R Bonneaud, G Calderini, J Chauveau, G Marchiori, J Ocariz, M Biasini, E Manoni, A Rossi, G Batignani, S Bettarini, M Carpinelli, G Casarosa, M Chrzaszcz, F Forti, M A Giorgi, A Lusiani, B Oberhof, E Paoloni, M Rama, G Rizzo, J J Walsh, A J S Smith, F Anulli, R Faccini, F Ferrarotto, F Ferroni, A Pilloni, G Piredda, C Bünger, S Dittrich, O Grünberg, M Heß, T Leddig, C Voß, R Waldi, T Adye, F F Wilson, S Emery, G Vasseur, D Aston, C Cartaro, M R Convery, J Dorfan, W Dunwoodie, M Ebert, R C Field, B G Fulsom, M T Graham, C Hast, W R Innes, P Kim, D W G S Leith, S Luitz, D B MacFarlane, D R Muller, H Neal, B N Ratcliff, A Roodman, M K Sullivan, J Va'vra, W J Wisniewski, M V Purohit, J R Wilson, A Randle-Conde, S J Sekula, M Bellis, P R Burchat, E M T Puccio, M S Alam, J A Ernst, R Gorodeisky, N Guttman, D R Peimer, A Soffer, S M Spanier, J L Ritchie, R F Schwitters, J M Izen, X C Lou, F Bianchi, F De Mori, A Filippi, D Gamba, L Lanceri, L Vitale, F Martinez-Vidal, A Oyanguren, J Albert, A Beaulieu, F U Bernlochner, G J King, R Kowalewski, T Lueck, I M Nugent, J M Roney, R J Sobie, N Tasneem, T J Gershon, P F Harrison, T E Latham, R Prepost, S L Wu
We search for single-photon events in 53 fb^{-1} of e^{+}e^{-} collision data collected with the BABAR detector at the PEP-II B-Factory. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle A^{'} through the process e^{+}e^{-}→γA^{'}; A^{'}→invisible. Such particles, referred to as "dark photons," are motivated by theories applying a U(1) gauge symmetry to dark matter. We find no evidence for such processes and set 90% confidence level upper limits on the coupling strength of A^{'} to e^{+}e^{-} in the mass range m_{A^{'}}≤8 GeV. In particular, our limits exclude the values of the A^{'} coupling suggested by the dark-photon interpretation of the muon (g-2)_{μ} anomaly, as well as a broad range of parameters for the dark-sector models.
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