论文标题
$bπ$ - 州污染$ b $ -Meson可观察到
$Bπ$-state contamination in $B$-meson observables
论文作者
论文摘要
预计具有额外尖锐的多粒子状态将导致晶格模拟中不可忽略的激发状态污染。我们表明，可以使用重型介子手性扰动理论来计算各种$ b $ b $ -meson可观测值（如$ b $ b $ -meson衰减常数和$ bb^*π$ coupling）的污染。我们以静态限制和手性扩展中的临时领先顺序工作。 $bπ$状态通常会高估了几个百分之几的可观测值，具体取决于两个当前未知的NLO低能系数的大小。将讨论具有光轴向矢量电流的三分函数独立测量其中之一的策略。
Multi-particle states with additional pions are expected to result in a non-negligible excited-state contamination in lattice simulations. We show that heavy meson chiral perturbation theory can be employed to calculate the contamination due to two-particle $Bπ$ states in various $B$-meson observables like the $B$-meson decay constant and the $BB^*π$ coupling. We work in the static limit and to next-to-leading order in the chiral expansion. The $Bπ$ states are found to typically overestimate the observables at the few percent level depending on the size of two currently unknown NLO low-energy coefficients. A strategy to independently measure one of them with the 3-point function of the light axial vector current will be discussed.
