论文标题
D混合的重量法量表设置
Renormalisation scale setting for D-mixing
论文作者
论文摘要
重型夸克膨胀（HQE）的幼稚应用得出了中性$ d $介子的衰减速率的理论估计值，该衰减速率低于实验确定的四个数量级。众所周知，这种巨大的抑制是由于严重的GIM取消而导致的。我们发现，可以通过单独选择不同内部夸克贡献的重量法量表来解决这种不匹配。对于$ b $和$ c $ hADRON的寿命，以及对于中性$ b $ mesons的衰减率差异，我们的比例设置过程的效果在于先前引用的理论不确定性，而我们获得了$ b $系统中半leptectonic cp symmetries的扩大理论不确定性。
A naive application of the heavy quark expansion (HQE) yields theory estimates for the decay rate of neutral $D$ mesons that are four orders of magnitude below the experimental determination. It is well known that this huge suppression results from severe GIM cancellations. We find that this mismatch can be solved by individually choosing the renormalisation scale of the different internal quark contributions. For $b$ and $c$ hadron lifetimes, as well as for the decay rate difference of neutral $B$ mesons the effect of our scale setting procedure lies within the previously quoted theory uncertainties, while we get enlarged theory uncertainties for the semi-leptonic CP asymmetries in the $B$ system.
