Speaker
Prof.
Kwei-Chou Yang
(Chung Yuan Christian University (TW))
Description
We study two-body charmless hadronic $B$ decays involving a tensor meson in the final state within the framework of QCD factorization (QCDF). Unlike the light vector meson, because of the G-parity of the tensor meson, both the chiral-even and chiral-odd two-parton light-cone distribution amplitudes of the tensor meson are antisymmetric under the interchange of momentum fractions of the quark and antiquark in the SU(3) limit. The factorizable amplitude with a tensor meson emitted vanishes under the factorization hypothesis owing to the fact that a tensor meson cannot be created from the local $V-A$ and tensor currents. As a result, $B^-\to \bar K_2^{*0}\pi^-$ and $\overline B^0\to K_2^{*-}\pi^+$ vanish in naive factorization. The experimental observation of the former implies the importance of nonfactorizable effects. For penguin-dominated $B\to TP$ and $TV$ decays, the predicted rates in naive factorization are normally too small by one to two orders of magnitude. In QCDF, they are enhanced by the power corrections from penguin annihilation and nonfactorizable contributions. The experimental observation that $f_T/f_L\ll 1$ for $B\to \phi K_2^*(1430)$, whereas $f_T/f_L\sim 1$ for $B\to \omega K_2^*(1430)$, can be accommodated in QCDF. More interesting results will be presented in the talk.
H.Y. Cheng and K.C. Yang, ``Charmless Hadronic B Decays into a Tensor Meson", Phys. Rev. D 83, 034001 (2011).
Primary author
Prof.
Kwei-Chou Yang
(Chung Yuan Christian University (TW))
Co-author
Prof.
Hai-Yang Cheng
(Institute of Physics, Academia Sinica)
