格点量子色动力学中B -> K稀有衰变的形状因子
Rare decay B -> K ll form factors from lattice QCD
摘要：
我们首次用非猝灭格点量子色动力学计算了标准模型中和标准模型以外B -> K11稀有衰变的形状因子。我们的格点量子色动力学计算对b价夸克采用非相对论性QCD公式，对轻价夸克采用高度改进的交错夸克公式，并采用MILC 2+1 asqtad系综.基于z展开的形状因子结果在q^2的整个运动学范围内都有效。我们构造了比f0/f+和fT/f+，它们在约束新物理和验证有效理论形状因子对称性关系时是有用的.我们还讨论了标准模型观测量的计算。
英文摘要：
We calculate, for the first time using unquenched lattice QCD, form factors for the rare decay B -> Kll in and beyond the Standard Model. Our lattice QCD calculation utilizes a nonrelativistic QCD formulation for the b valence quarks, the highly improved staggered quark formulation for the light valence quarks, and employs the MILC 2+1 asqtad ensembles. The form factor results, based on the z expansion, are valid over the full kinematic range of q^2. We construct the ratios f0/f+ and fT/f+, which are useful in constraining new physics and verifying effective theory form factor symmetry relations. We also discuss the calculation of Standard Model observables.
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