Artikel,
Baryonic D Decay \$D\_s^+pn\$ and Its Implication
(16.04.2008)
Zusammenfassung
The channel \$D\_s^+pn\$ is the only kinematically allowed baryonic D
decay. It proceeds solely through the W-annihilation topology. Hence, a recent
observation of this mode by CLEO will shed light on the dynamics of
W-annihilation. At the short-distance level, its branching ratio is very small,
of order \$10^-6\$, owing to chiral suppression. It receives long-distance
contributions through final-state scattering of the leading tree and
color-suppressed amplitudes. Assuming that the long-distance enhancement of
W-annihilation in the baryonic D decay is similar to that in the mesonic
\$D\_s^+\$ decay, where the latter can be obtained from the analysis of the
diagrammatic approach, we find that \$D\_s^+pn\$ becomes visible. The
observation of this baryonic D decay implies the dynamical enhancement of the
W-annihilation topology in the \$D\_s^+\$ decay.
