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arXiv 0903.3086hep-phhep-ex
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The B -> pi K Puzzle:2009 Update

The B -> pi K Puzzle: 2009 Update

Seungwon Baek, Cheng-Wei Chiang, David London

摘要:

一段时间以来,B -> π K衰变的测量结果与标准模型(SM)的预测不一致。在本文中,我们使用最新(2008年)的数据对这个谜题进行了更新。我们发现,情况变得远不那么清楚。仅对B -> pi K数据的拟合就表明了新物理学(NP)的存在。实际上,如果对来自独立测量的弱相位伽马添加约束-SM拟合-则发现拟合较差。另一方面,这并不可怕。如果人们愿意接受拟合中的一些缺陷,则可以认为SM可以解释B -> pi K数据。如果假设NP,则发现它只存在于电弱企鹅振幅中,如前所述。然而,配合充其量是公平的,比SM的改进并不是特别强。总而言之,虽然B -> pi K难题没有消失,但它已经变得越来越弱。

英文摘要:

The measurements of B -> pi K decays have been in disagreement with the predictions of the Standard Model (SM) for some time. In this paper, we perform an update of this puzzle using the latest (2008) data. We find that the situation has become far less clear. A fit to the B -> pi K data alone suggests the presence of new physics (NP). Indeed, if one adds a constraint on the weak phase gamma coming from independent measurements -- the SM fit -- one finds that the fit is poor. On the other hand, it is not terrible. If one is willing to accept some deficiencies in the fit, it can be argued that the SM can explain the B -> pi K data. If one assumes NP, it is found to be present only in the electroweak penguin amplitude, as before. However, the fit is fair at best, and the improvement over the SM is not particularly strong. All and all, while the B -> pi K puzzle has not disappeared, it has become weaker.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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