Baryonic D Decay $D_s^+\to p\bar n$ and Its Implication

Details Baryonic D Decay $D_s^+\to p\bar n$ and Its Implication Baryonic D Decay $D_s^+\to p\bar n$ and Its Implication

2008-03-20

arxiv.org/abs/0803.2910v3

Phys.Lett.B663:326-329,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 2 figures, one reference added, to appear in PLB

Scientific paper

10.1016/j.physletb.2008.04.033

The channel $D_s^+\to p\bar n$ 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 $D_s^+\to p\bar n$ becomes visible. The observation of this baryonic D decay implies the dynamical enhancement of the W-annihilation topology in the $D_s^+$ decay.

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