Shang-Yuu Tsai

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.

Understanding B → D * − N N ¯ and its implications

The CLEO Collaboration recently reported the observation of the

Evidence for factorization in three-body B → D (∗) K − K 0 decays

B^0\to D^{*-}p\bar{n}

Prediction of three-body B0→ρ−pn̄, π−pn̄ decay rates

mode at a rate only a factor of 4--5 lower than

Extraction of axial form factors from B 0 → D + K − K * 0 decay

B^0\to D^{*-}\rho^+

Prediction of Three-body

and

B^0\to \rho^-p\bar{n}, \pi^-p\bar{n}

D^{*-}\pi^+

Decay Rates

. We try to understand this with a factorization approach of current produced nucleon pairs. The baryon weak vector current form factors are related by isospin rotation to nucleon electromagnetic form factors. By using

UnderstandingB→D*−NN¯and its implications

G^{p,n}_M

Prediction of three-body B0 ---> rho- p anti-n, pi- p anti-n decay rates

measured from