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Vogel, I. P. J. Shipsey, J. C. Wang, J. Hietala, J. Insler, J. Libby, J. L. Rosner, J. Napolitano, J. P. Alexander, J. Rademacker, J. R. Patterson, J. Wiss, J. Xavier, J. Y. Ge, J. Zhu, K. K. Seth, K. M. Ecklund, K. Randrianarivony, K. W. Edwards, L. Fields, L. Gibbons, L. J. Pearson, L. Martin, L. M. Zhang, M. Artuso, M. J. Smith, M. Kornicer, M. R. Shepherd, M. Selen, N. Lowrey, P. Naik, P. Rubin, P. Spradlin, P. U. E. Onyisi, P. Zhou, P. Zweber, R. A. Briere, R. Ehrlich, R. E. Mitchell, R. Gray, R. Mountain, S. Blusk, S. Brisbane, S. Das, S. Dobbs, S. Mehrabyan, S. Ricciardi, S. Stone, S. W. Gray, T. K. Pedlar, T. Skwarnicki, T. Xiao, V. E. Kuznetsov, W. M. Sun, X. Shi, Z. Metreveli","submitted_at":"2010-11-04T16:05:17Z","abstract_excerpt":"We report the first observation of the decay D^+ -> eta' e^+ nu_e in two analyses, which combined provide a branching fraction of B(D+ -> eta' e nu) = (2.16 +/- 0.53 +/- 0.07) x 10^{-4}. 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