Yu-Ming Wang

Charmless nonleptonic B{sub s} decays to PP, PV, and VV final states in the perturbative QCD approach

We calculate the CP-averaged branching ratios and CP-violating asymmetries of a number of two-body charmless hadronic decays B{sub s}{sup 0}{yields}PP, PV, VV in the perturbative QCD (pQCD) approach to leading order in {alpha}{sub s} (here P and V denote light pseudoscalar and vector mesons, respectively). The mixing-induced CP violation parameters are also calculated for these decays. We also predict the polarization fractions of B{sub s}{yields}VV decays and find that the transverse polarizations are enhanced in some penguin-dominated decays such as B{sub s}{sup 0}{yields}K*K*, K*{rho}. Some of the predictions worked out here can already be confronted with the recently available data from the CDF Collaboration on the branching ratios for the decays B{sub s}{sup 0}{yields}K{sup +}{pi}{sup -}, B{sub s}{sup 0}{yields}K{sup +}K{sup -} and the CP asymmetry in the decay B{sub s}{sup 0}{yields}K{sup +}{pi}{sup -}, and are found to be in agreement within the current errors. A large number of predictions for the branching ratios, CP asymmetries, and vector-meson polarizations in B{sub s}{sup 0} decays, presented in this paper and compared with the already existing results in other theoretical frameworks, will be put to stringent experimental tests in forthcoming experiments at Fermilab, CERN LHC, and Super B factories.

Rare decays of Λ b →Λ+γ and Λ b →Λ+l + l − in the light-cone sum rules

Within the Standard Model, we investigate the weak decays of

Charmless two-body B ( s ) → V P decays in soft collinear effective theory

Lambda_b to Lambda + gamma

Anatomy of the pQCD Approach to the Baryonic Decays Lambda(b) ---> p pi, p K

and

Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules

Lambda_b to Lambda + l^{+} l^{-}

Charmless two-body B((s))-> VP decays in soft collinear effective theory

with the light-cone sum rules approach. The higher twist distribution amplitudes of

Exclusive processese+e−→VPinkTfactorization

Lambda

J/psi weak decays in the covariant light-front quark model

baryon to the leading conformal spin are included in the sum rules for transition form factors. Our results indicate that the higher twist distribution amplitudes almost have no influences on the transition form factors retaining the heavy quark spin symmetry, while such corrections can result in significant impacts on the form factors breaking the heavy quark spin symmetry. Two phenomenological models (COZ and FZOZ) for the wave function of

Rare decays of ? b ??+? and ? b ??+l + l - in the light-cone sum rules

Lambda

B to PP, PV decays analyzed in the soft collinear effective theory

baryon are also employed in the sum rules for a comparison, which can give rise to the form factors approximately 5 times larger than that in terms of conformal expansion. Utilizing the form factors calculated in LCSR, we then perform a careful study on the decay rate, polarization asymmetry and forward-backward asymmetry, with respect to the decays of