Hai-Yang Cheng

Covariant Light-Front Approach for s-wave and p-wave Mesons: Its Application to Decay Constants and Form Factors

We study the decay constants and form factors of the ground-state s-wave and low-lying p-wave mesons within a covariant light-front approach. Numerical results of the form factors for transitions between a heavy pseudoscalar meson and an s-wave or p-wave meson and their momentum dependence are presented in detail. In particular, form factors for heavy-to-light and B to D** transitions, where D** denotes generically a p-wave charmed meson, are compared with other model calculations. The experimental measurements of the decays B^- to D** pi^- and B to D D**_s are employed to test the decay constants of D**_s and the B to D** transition form factors. The heavy quark limit behavior of the decay constants and form factors is examined and it is found that the requirement of heavy quark symmetry is satisfied. The universal Isgur-Wise (IW) functions, one for s-wave to s-wave and two for s-wave to p-wave transitions, are obtained. The values of IW functions at zero recoil and their slope parameters can be used to test the Bjorken and Uraltsev sum rules.

Charmless hadronic B decays involving scalar mesons: Implications on the nature of light scalar mesons

The hadronic charmless

Charmless hadronic two-body decays of B(u) and B(d) mesons

B

QCD Factorization for Charmless Hadronic Bs Decays Revisited

decays into a scalar meson and a pseudoscalar meson are studied within the framework of QCD factorization. Based on the QCD sum rule method, we have derived the leading-twist light-cone distribution amplitudes of scalar mesons and their decay constants. Although the light scalar mesons

Mesonic form factors and the Isgur-Wise function on the light front

{f}_{0}(980)

Direct CP violation in two-body hadronic charmed meson decays

and

Scalar Glueball, Scalar Quarkonia, and their Mixing

{a}_{0}(980)

Revisiting scalar and pseudoscalar couplings with nucleons

are widely perceived as primarily the four-quark bound states, in practice it is difficult to make quantitative predictions based on the four-quark picture for light scalars. Hence, predictions are made in the 2-quark model for the scalar mesons. The short-distance approach suffices to explain the observed large rates of

Revisiting Charmless Hadronic B(u,d) Decays in QCD Factorization

{f}_{0}(980){K}^{\ensuremath{-}}

Quark-lepton complementarity and tribimaximal neutrino mixing from discrete symmetry

and