Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-05-20
Phys.Rev. D59 (1999) 014005
Physics
High Energy Physics
High Energy Physics - Phenomenology
42 pages (LaTex) including 19 figures, requires epsfig.sty; submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.59.014005
We present estimates of the direct (in decay amplitudes) and indirect (mixing- induced) CP-violating asymmetries in the non-leptonic charmless two-body decay rates for $B \to PP$, $B \to PV$ and $B \to VV$ decays and their charged conjugates, where P(V) is a light pseudoscalar (vector) meson. These estimates are based on a generalized factorization approach making use of next-to-leading order perturbative QCD contributions which generate the required strong phases. No soft final state interactions are included. We study the dependence of the asymmetries on a number of input parameters and show that there are at least two (possibly three) classes of decays in which the asymmetries are parametrically stable in this approach. The decay modes of particular interest are: $\optbar{B^0} \to \pi^+ \pi^-$, $\optbar{B^0} \to K_S^0 \pi^0$, $\optbar{B^0} \to K_S^0 \eta^\prime$, $\optbar{B^0} \to K_S^0 \eta$ and $\optbar{B^0} \to \rho^+ \rho^-$. Likewise, the CP-violating asymmetry in the decays $\optbar{B^0} \to K_S^0 h^0$ with $h^0=\pi^0,K_S^0, \eta,\eta^\prime$ is found to be parametrically stable and large. Measurements of these asymmetries will lead to a determination of the phases $\sin 2\alpha$ and $\sin 2 \beta$ and we work out the relationships in these modes in the present theoretical framework. We also show the extent of the so-called "penguin pollution" in the rate asymmetry $A_{CP}(\pi^+ \pi^-)$ and of the "tree shadow" in the asymmetry $A_{CP}(K_S^0\eta^\prime)$ which will effect the determination of $\sin 2 \alpha$ and $\sin 2 \beta$ from the respective measurements. CP-violating asymmetries in $B^\pm \to \pi^\pm \eta^\prime$, $B^\pm \to K^{*\pm} \eta$, $B^\pm \to K^{*\pm} \eta^\prime$ and $B^\pm \to K^{*\pm}\rho^0$ are potentially interesting and are studied here.
Ali Abbas
Kramer Georgiana
Lu Cai-Dian
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