Studies of D^+ -> {eta', eta, phi} e^+ nu_e
CLEO Collaboration: J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M., Selen, J. Wiss, M. Kornicer, R. E. Mitchell, M. R. Shepherd, C. M. Tarbert,, D. Besson, T. K. Pedlar, J. Xavier, D. Cronin-Hennessy, J. Hietala, P., Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze
TL;DR
This paper reports the first observation of the decay D^+ -> eta' e^+ nu_e, measures the branching fractions of D^+ decays to eta, eta', and phi, and provides the first form factor measurement for these decays.
Contribution
The study presents the first observation of D^+ -> eta' e^+ nu_e decay, improves measurements of D^+ -> eta e^+ nu, and introduces the first form factor measurement for these processes.
Findings
First observation of D^+ -> eta' e^+ nu_e decay.
Improved measurement of B(D^+ -> eta e^+ nu).
First form factor measurement for D^+ -> eta' e^+ nu_e.
Abstract
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}. We also provide an improved measurement of B(D+ -> eta e nu) = (11.4 +/- 0.9 +/- 0.4) x 10^{-4}, provide the first form factor measurement, and set the improved upper limit B(D+ -> phi e nu) < 0.9 x 10^{-4} (90% C.L.).
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