Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-25
Phys.Rev.D80:074031,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 1 figure. Experimental data and references updated, to appear in PRD
Scientific paper
10.1103/PhysRevD.80.074031
Within the framework of QCD factorization (QCDF), power corrections due to penguin annihilation can account for the observed rates of penguin-dominated two-body decays of $B$ mesons and direct CP asymmetries $A_{CP}(K^-\pi^+)$, $A_{CP}(K^{*-}\pi^+)$, $A_{CP}(K^-\rho^0)$ and $A_{CP}(\pi^+\pi^-)$. However, the predicted direct CP-violating effects in QCDF for $B^-\to K^-\pi^0,K^-\eta,\pi^-\eta$ and $\bar B^0\to\pi^0\pi^0$ are wrong in signs when confronted with experiment. We show that subleading $1/m_b$ power corrections to the color-suppressed tree amplitude due to spectator scattering or final-state interactions will yield correct signs for aforementioned CP asymmetries and accommodate the observed $\pi^0\pi^0$ and $\rho^0\pi^0$ rates simultaneously. Implications are discussed.
Cheng Hai-Yang
Chua Chun-Khiang
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