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

Abstract

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.

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

References in corpus (14)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• QCD Factorization for $B\to \pi \pi$ Decays: Strong Phases and CP Violation in the Heavy Quark Limit
• QCD factorization for exclusive, non-leptonic B meson decays: General arguments and the case of heavy-light final states
• QCD Factorization in B -> pi K, pi pi Decays and Extraction of Wolfenstein Parameters
• Penguin Enhancement and $B\to K\pi$ decays in perturbative QCD
• Mixing and Decay Constants of Pseudoscalar Mesons
• Final State Interactions in Hadronic B Decays
• Weak form factors for heavy meson decays: an update
• B -> M1 M2: Factorization, Charming Penguins, Strong Phases, and Polarization
• Final-State Phases in Charmed Meson Two-Body Nonleptonic Decays
• Understanding $B\to D^{\ast -}N\bar{N}$ and Its Implications
• Weak Annihilation and the Effective Parameters a_1 and a_2 in Nonleptonic D Decays
• Exclusive Baryonic B Decays Circa 2005

Cited by in corpus (11)

• Violation of PCAC and two-body baryonic $B$ and $D_s$ decays
• Testing the W-exchange mechanism with two-body baryonic B decays
• Charm Physics - A Field Full with Challenges and Opportunities
• Hadronic D and D_s Meson Decays
• The semileptonic baryonic decay $D_s^{+}\to p\bar{p}{e}^{+}{\nu }_e$
• Observation of $D_s^{+}\to p\bar{n}$ and confirmation of its large branching fraction
• Baryonic $B$ meson decays
• Corrections to the instanton configuration as baryon in holographic QCD
• Large CP Asymmetries from Final-State Interactions in Charmful Baryonic Decays of $B^0\to {\Xi }_c^{+}{\overline{\Xi }}_c^{-}$ and $B_s^0\to {\Lambda }_c^{+}{\overline{\Lambda }}_c^{-}$
• First observation of the ${\overline{B}}_s^0\to {\Lambda }_c^{+}{\overline{\Lambda }}_c{}^{-}$ decay and evidence for the ${\overline{B}}^0\to {\Lambda }_c^{+}{\overline{\Lambda }}_c{}^{-}$ decay
• Theoretical Review on Hadronic D/D_s Decays