论文标题
使用精确的晶格QCD形式搜索$ b \ in $ b \ to k \ ell^+\ ell^ - $和$ b \ tokν\barν$的搜索
The search for new physics in $B \to K \ell^+\ell^-$ and $B \to K ν\barν$ using precise lattice QCD form factors
论文作者
论文摘要
我们使用重型hisq形式主义提出了$ b \ to $ b \ to $ b \ to $ b \ to $ b \ to $ b \的标量和张量形式的改进的标量,vector和张量形式,使用重hisq形式主义,以更准确地归一化弱电流的标准化。在最出色的合奏中与接近物理$ b $的大众合作,其中包括三个带有物理光夸克的合奏,我们以良好的精度覆盖了完整的物理$ q^2 $范围。我们对$ q^2 = 0 $的不确定性比早期工作要好三倍。 我们将使用我们的形式因素的标准模型可观察到的标准模型与实验测量结果,以使稀有风味变化的中性当前工艺$ b \与k \ ell^+\ ell^ - $和$ b \与kν\barν$进行比较,并讨论了出现的紧张局势的意义。
We present HPQCD's improved scalar, vector and tensor form factors for $B \to K$ semileptonic decays, using the heavy-HISQ formalism for more accurate normalisation of the weak currents. Working with masses close to the physical $b$ on the finest ensemble and including three ensembles with physical light quarks, we cover the full physical $q^2$ range with good precision. Our uncertainties at $q^2=0$ are a factor of three better than earlier work. We compare Standard Model observables using our form factors to experimental measurements for the rare flavour changing neutral current processes $B \to K \ell^+\ell^-$ and $B \to K ν\barν$ and discuss the significance of the tensions that arise.