论文标题
描述B介子衰减的外形因素的Z扩展的变化
Variations to the z-Expansion of the Form Factor Describing the Decay of B Mesons
论文作者
论文摘要
我们使用从Belle协作收集的数据检查了粒子衰变$ b^0 \ rightArrow d^ - \ ell^+ν_ {\ ell} $的衰减率。我们研究了描述差异衰减速率的三个参数化，Caprini，Lellouch和Neubert（CLN）参数化，Boyd，Grinstein和LeBED（BGL）参数化以及Bourrely，Caprini和Lellouch（BCL）参数化。外形因素是HADRONIC RECOIL变量$ W $的函数，每个参数化包含独特的免费参数，这是本工作的重点。我们通过拟合低$ w $数据的许多不同子集，然后使用$χ^2 $ - metric比较拟合的预测与高$ W $数据的预测来测试外形的推断。通过仅拟合低$ w $数据，我们就可以检查外推的稳定性，这对于晶格模拟来说是有益的。
We examine the decay rate of the particle decay $B^0 \rightarrow D^- \ell^+ ν_{\ell}$ using data collected from the Belle Collaboration. We studied three parameterizations of the form factor which describe the differential decay rate, the Caprini, Lellouch, and Neubert (CLN) parametrization, the Boyd, Grinstein, and Lebed (BGL) parametrization, and the Bourrely, Caprini, and Lellouch (BCL) parameterization. The form factor is a function of the hadronic recoil variable $w$, and each parameterization contains unique free parameters which are the focus of this work. We test the extrapolations of the form factor by fitting many different subsets of the low $w$ data and then compare the prediction of the fit to the high $w$ data using a $χ^2$-metric. By only fitting the low $w$ data we are able to examine the stability of extrapolations which will be informative for lattice simulations.
