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arXiv 1003.5980hep-phhep-exnucl-th
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标量共振对B_s - \bar B_s混合角的影响

Scalar resonance effects on the B_s - \bar B_s mixing angle

O. Leitner, J. -P. Dedonder, B. Loiseau, B. El-Bennich

摘要:

在包含$\alphas$中所有首阶修正的广义QCD分解中分析了$B_s^0 \to J/ψϕ$和$B_s^0 \to J/ψf_0(980)$衰变。我们指出,我们计算的宽度之比,$Γ(B_s^0\to J/ψf_0(980), f_0(980)\to π^+π^-)/ Γ(B_s^0 \to J/ψϕ,ϕ\to K^+K^-)$,强烈地表明,$S$波的影响,在$f_0(980)$的子介子或K介子不能忽略的$B_s-\bar{B}_s$混合角,$-2β_s$,从$B_s^0 \to ϕJ/ψ$衰变振幅。

英文摘要:

The $B_s^0 \to J/ψϕ$ and $B_s^0 \to J/ψf_0(980)$ decays are analyzed within generalized QCD factorization including all leading-order corrections in $\alphas$. We point out that the ratio of our calculated widths, $Γ(B_s^0\to J/ψf_0(980), f_0(980)\to π^+π^-)/ Γ(B_s^0 \to J/ψϕ,ϕ\to K^+K^-)$, strongly indicates that $S$-wave effects in the $f_0(980)$'s daughter pions or kaons cannot be ignored in the extraction of the $B_s-\bar{B}_s$ mixing angle, $-2β_s$, from the $B_s^0 \to ϕJ/ψ$ decay amplitudes.

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