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Lees, J P; Tisserand, V; Stugu, B; Feng, M; Hearty, C; Khan, A; Kravchenko, E A; Serednyakov, S I; Skovpen, Yu I; Gary, J W; Long, O; Kovalskyi, D; Richman, J D; West, C A; Eisner, A M; Seiden, A; Chao, D S; Cheng, C H; Flood, K T; Miyashita, T S; Sokoloff, M D; Sun, L; Bloom, P C; Wagner, S R; Toki, W H; Spaan, B; Playfer, S; Finocchiaro, G; Robutti, E; Bhuyan, B; Prasad, V; Adametz, A; Uwer, U; Lacker, H M; Chen, C; Malaescu, B; Gabathuler, E; Cowan, G; Fritsch, M; Griessinger, K; Hafner, A; Jawahery, A; Roberts, D A; Cheaib, R; Robertson, S H; Sonnek, P; Jessop, C P; Kass, R; Margoni, M; Morandin, M; Simi, G; Simonetto, F; Stroili, R; Akar, S; Ben-Haim, E; Leruste, Ph; Rossi, A; Casarosa, G; Oberhof, B; Paoloni, E; Walsh, J J; Lopes Pegna, D; Faccini, R; Ferrarotto, F; Gaspero, M; Dittrich, S; Hess, M; Leddig, T; Voß, C; Wilson, F F; Emery, S; Innes, W R; Kim, P; Luitz, S; Lynch, H L; MacFarlane, D B; Neal, H; Salnikov, A A; Sullivan, M K; Randle-Conde, A; Bellis, M; Peimer, D R; Ritchie, J L; Schwitters, R F; Wray, B C; Lou, X C; De Mori, F; Gamba, D; Vitale, L; Oyanguren, A; Beaulieu, A; Choi, H H F; Lueck, T; Nugent, I M; Harrison, P F; Latham, T E; Band, H R; Dasu, S; Pan, Y; Prepost, R
Physical review letters, 2014-Nov-14, Letnik: 113, Številka: 20Journal Article
Dark sectors charged under a new Abelian interaction have recently received much attention in the context of dark matter models. These models introduce a light new mediator, the so-called dark photon (A^{'}), connecting the dark sector to the standard model. We present a search for a dark photon in the reaction e^{+}e^{-}→γA^{'}, A^{'}→e^{+}e^{-}, μ^{+}μ^{-} using 514 fb^{-1} of data collected with the BABAR detector. We observe no statistically significant deviations from the standard model predictions, and we set 90% confidence level upper limits on the mixing strength between the photon and dark photon at the level of 10^{-4}-10^{-3} for dark photon masses in the range 0.02-10.2 GeV. We further constrain the range of the parameter space favored by interpretations of the discrepancy between the calculated and measured anomalous magnetic moment of the muon.
