标题： B_s系统中由于与隐藏伪标量的混合导致的Delta Gamma CP破坏贡献 显示英文标题

标题： CP Violating Contribution to Delta Gamma in the B_s System from Mixing with a Hidden Pseudoscalar

摘要： 最近在B_s介子的半轻子衰变中发现的CP破坏不对称性的证据无法在标准模型内得到解释。这种不对称性可以通过对质量矩阵或衰变矩阵的ΔB=2成分的新物理贡献来解释。我们表明，与一个质量约为5 GeV的隐藏伪标量介子混合可以导致混合中的新CP破坏贡献，并可以解决该系统中的几个异常，包括宽度差异、平均宽度和电荷不对称性。我们还讨论了隐藏介子对其他b物理可观测量的影响，并提出了隐藏介子的可行衰变模式。我们对B强子的新衰变通道进行了预测，这些通道可以在Tevatron、LHC和B工厂进行测试。 显示英文摘要

摘要： Recent evidence for a CP violating asymmetry in the semileptonic decays of B_s mesons cannot be accommodated within the Standard Model. Such an asymmetry can be explained by new physics contributions to Delta B=2 components of either the mass matrix or the decay matrix. We show that mixing with a hidden pseudoscalar meson with a mass around 5 GeV can result in a new CP violating contribution to the mixing and can resolve several anomalies in this system including the width difference, the average width and the charge asymmetry. We also discuss the effects of the hidden meson on other b physics observables, and present viable decay modes for the hidden meson. We make predictions for new decay channels of B hadrons, which can be tested at the Tevatron, the LHC and B-factories.