Chun-Khiang Chua

Charmless three-body baryonic B decays

Motivated by recent data on B-> p pbar K decay, we study various charmless three-body baryonic B decay modes, including Lambda pbar pi, Sigma0 pbar pi, p pbar pi, p pbar Kbar0, in a factorization approach. These modes have rates of order 10^{-6}. There are two mechanisms for the baryon pair production, current-produced and transition. The behavior of decay spectra from these baryon production mechanisms can be understood by using QCD counting rules. Predictions on rates and decay spectra can be checked in the near future.

Branching Fractions and Direct CP Violation in Charmless Three-body Decays of B Mesons

Charmless three-body decays of B mesons is studied using a simple model based on the framework of the factorization approach. Hadronic three-body decays receive both resonant and nonresonant contributions. Dominant nonresonant contributions to tree-dominated three-body decays arise from the

CP-violating asymmetries in B0 decays to K+ K- K0(S(L)) and K0(S) K0(S) K0(S(L))

b\to u

CP violating b ---> s gamma decay in supersymmetric models

tree transition which can be evaluated using heavy meson chiral perturbation theory valid in the soft meson limit. For penguin-dominated decays, nonresonant signals come mainly from the penguin amplitude governed by the matrix elements of scalar densities

\overline B\to \Lambda\,\bar p\,\pi

. We use the measurements of

decays and such

\bar B^0\to K_SK_SK_S

Bottom Baryon Decays to Pseudoscalar Meson and Pentaquark

to constrain the nonresonant component of

Direct CP Violation in Charmless Three-body Decays of

. The intermediate vector meson contributions to three-body decays are identified through the vector current, while the scalar meson resonances are mainly associated with the scalar density. While the calculated direct CP violation in