Rates and $CP$ asymmetries of Charmless Two-body Baryonic $B_{u,d,s}$ Decays

Understand

With the experimental evidences of $\overline B {}^0\to p \overline{p}$ and $B^-\to\Lambda\overline p$ decays, it is now possible to extract both tree and penguin amplitudes of the charmless two-body baryonic $B$ decays for the first time.

• The extracted penguin-tree ratio agrees with the expectation.
• Using the topological amplitude approach with the experimental results on $\overline B {}^0\to p \overline{p}$ and $B^-\to\Lambda\bar p$ decay rates as input, predictions on all other $\overline B_q\to {\cal B} \overline {\cal B}$, ${\cal B} \overline {\cal D}$, ${\cal D} \overline {\cal B}$ and ${\cal D} \overline {\cal D}$ decay rates, where ${\mathcal B}$ and ${\cal D}$ are the low lying octet and decuplet baryons, respectively, are given.
• It is non-trivial that the results do not violate any existing experimental upper limit.