First Observation of the Decay Ds+ to proton anti-neutron
Abstract
Using e+e- -> Ds*+ Ds- data collected near the peak Ds production energy, Ecm=4170 MeV, with the CLEO-c detector, we present the first observation of the decay Ds+ -> proton anti-neutron. We measure a branching fraction B(Ds+ -> p anti-n = (1.30 +- 0.36 +0.12 -0.16) x 10-3. This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.
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