The rare decay B0 → φφ can occur only via penguin annihilation topology in the standard model. We calculate this channel in the perturbative QCD approach. The predicted branching ratio is very small at (10−8). We also give the polarization fractions, which shows that the transverse polarization contribution is comparable to the longitudinal one, due to a big transverse contribution from factori...

It is shown that the experimental data of ψ and ψ are consistent with a −90◦ phase between the strong and eletromagnetic decay amplitudes. The ee → ρπ measured at ψ is also consistent with the branching ratio predicted by Rosner’s scenario on ρπ puzzle in charmonium physics. This scenario leads to a possible large charmless branching ratio in ψ decays. work in collaboration with C. Z. Yuan and ...

Parametric Lindenmayer systems (L-systems) are formulated to generate branching tree structures that can incorporate the physiological laws of arterial branching. By construction, the generated trees are de facto fractal structures, and with appropriate choice of parameters, they can be made to exhibit some of the branching patterns of arterial trees, particularly those with a preponderant valu...

Rare t → cgg decay can only appear at loop level in the Standard Model (SM), and naturally they are strongly suppressed. These flavor changing decays induced by the mediation of spin–0 and spin–2 unparticles, can appear at tree level in unparticle physics. In this work the virtual effects of unparticle physics in the flavor–changing t → cgg decay is studied. Using the SM result for the branchin...

We study the two-body and three-body charmful baryonic B decays: B 0 → Λc p̄ and B → Λc p̄ π(ρ). The factorizable W -exchange contribution to B 0 → Λc p̄ is negligible. Applying the bag model to evaluate the baryon-to-baryon weak transition matrix element, we find B(B → Λc p̄) <∼ 1.1 × 10−5|gB0pΣ+b /6| 2 with gB0pΣ+ b being a strong coupling for the decay Σ+b → B 0 p and hence the predicted branchi...

We study the exclusive Λb → Λl+l− decay in the Appelquist, Chang, Dobrescu model within one universal extra dimension. We investigate the sensitivity of the branching ratio, lepton polarization and forward–backward asymmetry AFB to the compactification parameter 1/R We obtain that the branching ratio changed about 50% compared to the SM value, when 1/R = 200 GeV and zero position of the forward...