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arXiv 0805.1963hep-ph
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B到f_0 K_S衰变中的CP不对称性

CP Asymmetries in B to f_0 K_S Decays

Rupak Dutta, Susan Gardner

摘要:

我们考虑了B到f_0(980)K_S衰变中的分支比和CP不对称性,以确定由标准模型物理引起的含时CP不对称性对sin(2 β)的偏离。我们在QCD分解框架下,假设f_0(980)是q态,并在理论参数空间上随机扫描,得到了B到f_0(980)K_S衰变振幅的Delta \bar{q},估计了Delta S_{f_0 K_S}的可能范围.将实验分支比的值分别施加在其中心值的1 sigma和3 sigma内作为约束,我们发现对于其中参数被允许在其中心值的1 sigma内变化的扫描,Delta S_{f_0 K_S}的范围为[0.018,0.033],并且范围为[-0.019,0.033]。0.064],其中参数在其中心值的3 sigma内变化。

英文摘要:

We consider the branching ratio and the CP asymmetries in B to f_0(980)K_S decay to the end of determining the deviation of the time-dependent CP asymmetry from sin(2 beta) arising from Standard Model physics. We obtain Delta S_{f_0 K_S} within the context of the QCD factorization framework for the B to f_0(980)K_S decay amplitudes assuming the f_0(980) is a q\bar{q} state and employing a random scan over the theoretical parameter space to assess the possible range in Delta S_{f_0 K_S}. Imposing the value of the experimental branching ratio within 1 sigma and 3 sigma, respectively, of its central value as a constraint, we find the range of Delta S_{f_0 K_S} to be [0.018, 0.033] for a scan in which the parameters are allowed to vary within 1 sigma of their central values and the range [-0.019, 0.064] for a scan in which the parameters vary within 3 sigma of their central values.

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