Constraints on the CKM angle $α$ from the measured CP asymmetries and branching ratios of $B \to π^+ π^-, π^+ π^0$ and $K^0π^+$ decays

Details Constraints on the CKM angle $α$ from the measured CP asymmetries and branching ratios of $B \to π^+ π^-, π^+ π^0$ and $K^0π^+$ decays Constraints on the CKM angle $α$ from the measured CP asymmetries and branching ratios of $B \to π^+ π^-, π^+ π^0$ and $K^0π^+$ decays

2003-03-10

arxiv.org/abs/hep-ph/0303070v4

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, Revtex, 10 PS/EPs figures, some corrections have been made, several new references added. Repot-no: BIHEP-TH-2003-7

Scientific paper

In this paper, we draw constraints on the Cabibbo-Kobayashi-Maskawa (CKM) angle $\alpha$ and the strong phase $\delta$ from the experimental measurements of $\ssb$, the CP-violating asymmetries and branching ratios of $B \to \pi^+ \pi^-, \pi^+ \pi^0$ and $K^0 \pi^+$ decays. In the SM, the measured $\ssb$ leads to an upper limit on $\alpha$: $\alpha \leq 180^\circ-\beta$. Taking the weighted-average of the newest BaBar and Belle measurements of $\spp$ and $\app$ in $B^0 \to \pi^+\pi^-$ decay as the experimental input, we find the allowed range of angle $\alpha$, $76^\circ \leq \alpha \leq 135^\circ$ for $r=|P/T| =0.3 \pm 0.1 $. From the measured CP-averaged branching ratios of $B \to \pi^+ \pi^-, \pi^+ \pi^0$ and $K^0 \pi^+$ decays, we found an inequality, $\cos{\alpha} \cos{\delta} \geq 0.45$. The region of $70^\circ \leq \alpha \leq 110^\circ$ is thus excluded by applying this inequality. The combined constraints on $\alpha$ and $\delta$ are $117^\circ \leq \alpha \leq 135^\circ$ and $-160^\circ \leq \delta \leq -132^\circ$ if we take $\spp=0.49 \pm 0.27$ and $\app=0.51 \pm 0.19$ as the experimental input. The new lower limit on the angle $\alpha$ is dominated by the measured branching ratios considered in this paper, and is much stronger than those obtained before.

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