Studies of the Cabbibo-Suppressed Decays $D^+ \to π^0 \ell^+ ν$ and $D^+ \to ηe^+ ν_e$

Details Studies of the Cabbibo-Suppressed Decays $D^+ \to π^0 \ell^+ ν$ and $D^+ \to ηe^+ ν_e$ Studies of the Cabbibo-Suppressed Decays $D^+ \to π^0 \ell^+ ν$ and $D^+ \to ηe^+ ν_e$

1997-03-25

arxiv.org/abs/hep-ex/9703013v1

Phys.Lett.B405:373-378,1997

Physics

High Energy Physics

High Energy Physics - Experiment

10 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1016/S0370-2693(97)00649-7

Using 4.8 fb$^{-1}$ of data taken with the CLEO II detector, the branching fraction for the Cabibbo-suppressed decay $D^+\to\pi^0\ell^+\nu$ measured relative to the Cabibbo favored decay $D^+\to\bar{K^0}\ell^+\nu$ is found to be $0.046\pm 0.014\pm 0.017$. Using $V_{cs}$ and $V_{cd}$ from unitarity constraints, we determine $| f_+^{\pi}(0)/f_+^K(0)|^2=0.9\pm 0.3\pm 0.3$ We also present a 90% confidence level upper limit for the branching ratio of the decay $D^+ \to \eta e^+\nu_e$ relative to that for $D^+ \to \pi^0 e^+\nu_e$ of 1.5.

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