Physical Review Letters 100,18 (2008)
Using e(+) e(-) -> D-s(*-) D-s(+) data collected near the peak D-s production energy, E-cm = 4170 MeV, with the CLEO-c detector, we present the first observation of the decay D-s(+) -> p (n) over bar. We measure a branching fraction B(D-s(+) -> p (n) over bar) = (1.30 +/- 0.36(-0.16)(+0.12)) x 10(-3). This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.
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