探索$B→πK$衰变的新物理学

R. Fleischer, R. Jaarsma, E. Malami, K. Vos
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引用次数: 1

摘要

在过去的二十年中,$B \到$ pi K$的衰变受到了很多关注。它们特别有趣,因为对这些衰减的主要贡献来自QCD企鹅拓扑。此外,电弱企鹅振幅的贡献与树的拓扑结构相当。在过去,发现$B_d^0 \与\pi^0 K_{\rm S}$的CP不对称性之间的相关性存在差异。我们给出了这种情况的最新图景,并考虑了新的限制因素,发现影响变得更大了。修正的电弱企鹅扇区给出了一个有吸引力的解释。我们利用B到K衰减振幅之间的同位旋关系来确定相关参数,仅最小限度地使用SU(3)对称性。另一个重要的约束是由混合诱导的CP不对称性$B_d^0 \到$ pi^0 K_{\rm S}$提供的。我们的策略在下一代$B$物理实验中的应用可能会建立新物理学,并揭示电弱企鹅扇区中CP违反的新来源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Probing New Physics in $B → πK$ Decays
Over the last two decades the $B \to \pi K$ decays have received a lot of attention. They are particularly interesting since the main contribution to these decays comes from QCD penguin topologies. Furthermore, electroweak penguin amplitudes give a contribution comparable to the tree topologies. In the past, a discrepancy was found in the correlation between the CP asymmetries of $B_d^0 \to \pi^0 K_{\rm S}$. We give an up-to-date picture of this situation and consider new constraints, finding that the effect has become larger. An attractive explanation is offered by a modified electroweak penguin sector. We employ an isospin relation between the amplitudes of the $B \to \pi K$ decays to determine the relevant parameters, making only minimal use of the $SU(3)$ flavour symmetry. Another essential constraint is provided by the mixing-induced CP asymmetry of $B_d^0 \to \pi^0 K_{\rm S}$. The application of our strategy at the next generation of $B$-physics experiments may establish New Physics and reveal new sources of CP violation in the electroweak penguin sector.
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