1305.7021 (Hsiang-nan Li et al.)

Branching ratios and direct CP asymmetries in $D\to PV$ decays    [PDF]

Hsiang-nan Li, Cai-Dian Lü, Qin Qin, Fu-Sheng Yu

We study the two-body hadronic $D\to PV$ decays, where $P$ ($V$) denotes a pseudoscalar (vector) meson, in the factorization-assisted topological-amplitude approach proposed in our previous work. This approach is based on the factorization of short-distance and long-distance dynamics into Wilson coefficients and hadronic matrix elements of four-fermion operators, respectively, with the latter being parameterized in terms of several nonperturbative quantities. We further take into account the $\rho$-$\omega$ mixing effect, which improves the global fit to the branching ratios involving the $\rho^0$ and $\omega$ mesons. Combining short-distance dynamics associated with penguin operators and the hadronic parameters determined from the global fit to branching ratios, we predict direct CP asymmetries. In particular, the direct CP asymmetries in the $D^0\to K^0\bar{K}^{*0}, \bar{K}^0K^{*0}$, $D^+\to\pi^+\rho^0$ and $D_s^+\to K^+\omega, K^+\phi$ decays are found to be of ${\cal O}(10^{-3})$, which can be observed at the LHCb or future Super-$B$ factory. We also predict the CP asymmetry observables of some neutral $D$ meson decays.

View original: http://arxiv.org/abs/1305.7021