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arXiv 1504.01170hep-lat
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有限体积对$K_L$ - $K_S$质量差的影响

Effects of finite volume on the $K_L$-$K_S$ mass difference

Norman H. Christ, Xu Feng, Guido Martinelli, Christopher T. Sachrajda

摘要:

当使用格点量子色动力学计算时,涉及两个或多个壳层粒子的现象对有限体积的影响特别敏感,需要特殊处理。本文推广了Lüscher,Lellouch和Lüscher关于有限体积对两粒子谱和两粒子衰变振幅的首阶效应的结果,从而确定了$K^0$和$\overline{K^0}$态二阶混合中的有限体积效应.我们扩展了金,Sachrajda和夏普的方法,提供了一个直接的,统一的治疗这三个,相关的,有限体积校正。特别是,领先的,有限体积修正$K_L$ - $K_S$质量差$ΔM_K$和CP违反参数$ε_K$的确定,包括潜在的大的影响,可能会出现从近简并的K介子质量和能量的有限体积,二π态。

英文摘要:

Phenomena that involve two or more on-shell particles are particularly sensitive to the effects of finite volume and require special treatment when computed using lattice QCD. In this paper we generalize the results of Lüscher, and Lellouch and Lüscher, which determine the leading order effects of finite volume on the two-particle spectrum and two-particle decay amplitudes to determine the finite-volume effects in the second order mixing of the $K^0$ and $\overline{K^0}$ states. We extend the methods of Kim, Sachrajda and Sharpe to provide a direct, uniform treatment of these three, related, finite-volume corrections. In particular, the leading, finite-volume corrections to the $K_L$-$K_S$ mass difference $ΔM_K$ and the CP violating parameter $ε_K$ are determined, including the potentially large effects which can arise from the near degeneracy of the kaon mass and the energy of a finite-volume, two-pion state.

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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