arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1512.02440hep-lathep-ph
收藏

格点量子色动力学中的CP破坏和K介子弱矩阵元

CP violation and Kaon weak matrix elements from Lattice QCD

Nicolas Garron

摘要:

在这篇简短的评论中,我介绍了最近的格子计算的K介子弱矩阵元有关的$K \to ππ$衰变和中性K介子混合。这些矩阵元素是理论上确定CP破坏参数$ε$和$ε'$的关键。最近取得了令人印象深刻的进展,特别是第一个现实的计算$ε'/ε$与物理运动学已在[1]中报道。新颖的是$ΔI = 1/2$通道,而$ΔI = 3/2$的贡献,现在计算在几个值的晶格间距和外推到连续极限。我还将介绍$B_K$的地位,并讨论其误差预算,特别强调扰动误差。最后,我将审查中性K介子混合超出标准模型的矩阵元素,并认为不同的合作观察到的差异可以解释的重整化程序的相关四夸克运营商。

英文摘要:

In this short review, I present the recent lattice computations of kaon weak matrix elements relevant to $K \to ππ$ decays and neutral kaon mixing. These matrix elements are key to the theoretical determination of the CP violation parameters $ε$ and $ε'$ . Impressive progress have been achieved recently, in particular the first realistic computation of $ε'/ε$ with physical kinematics has been reported in [1]. The novelty is the $ΔI = 1/2$ channel, whereas the $ΔI = 3/2$ contribution is now computed at several values of the lattice spacing and extrapolated to the continuum limit. I will also present the status of $B_K$ and discuss its error budget, with a particular emphasis on the perturbative error. Finally I will review the matrix elements of neutral kaon mixing beyond the standard model and will argue that the discrepancy observed by different collaborations could be explained by the renormalisation procedure of the relevant four-quark operators.

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。

↑