B(s) to light meson semileptonic decays from lattice QCD

晶格QCD计算B(s)到光介子半光子衰变的形式因子和相关现象研究的关键目标是确定，在目前已知的基础上提高精度，预测几个B(s)弱衰变到光介子的半光子衰变的标准模型速率所需的强子形式因子。相关的现象学将包括对CKM矩阵元素Vub的新测定以及对罕见衰变的预测。新颖的研究内容包括新的、更精确的形状因子结果，从而更精确地确定Vub，这是寻找超越标准模型的物理的关键参数。考虑到使用“重HISQ”方法来处理b夸克，这应该是可能的。使用的方法是晶格QCD， MILC nf=2+1+1 HISQ规范场配置和HISQ重夸克（从粲子到底）。

Lattice QCD calculation of form factors for B(s) to light meson semileptonic decays and associated phenomenologyThe key objectives of the research are the determination, with improved precision over what is currently known, of the hadronic form factors needed to predict Standard Model rates for semileptonic decays of several B(s) weak decays to light mesons. The associated phenomenology will include new determinations of the CKM matrix element Vub as well as predictions for rare decays.The novel research content includes new, greater precision results for the form factors and consequently, a more precise determination of Vub, a key parameter in the search for physics beyond the Standard Model. This should be possible given the use of the 'heavy HISQ' method for dealing with the b quark.The methodology to be used is lattice QCD, with MILC nf=2+1+1 HISQ gauge field configurations and HISQ heavy quarks (from charm to bottom).