论文标题
重新访问适合$ b^{0} \ d^{* - } \ ell^{+}ν_ {\ ell} $用于测量$ | v_ | v_ v_ {cb} | $，具有新颖的方法和初步的LQCD数据
Revisiting fits to $B^{0} \to D^{*-} \ell^{+} ν_{\ell}$ to measure $|V_{cb}|$ with novel methods and preliminary LQCD data at non-zero recoil
论文作者
论文摘要
我们提出了一项对独家$ b^{0} \ to d^{* - } \ ell^{+}ν_ {\ ell} $测量的研究，用于确定cabbibo-kobayashi-maskawa matrix mattrix元素幅度$ | v_ | v_ v_ v_ {cb} | $，基于最新的belle，结果是用Caprini-lellouch-Neubert（CLN）和Boyd-Grinstein-Lebed（BGL）形式因子参数化获得的，并且有无包括初步的晶格QCD QCD QCD测量在JLQCD协作中的非Zero Hadronic后坐力处的形式。在不同的情况下，CLN和BGL拟合分别分别研究了理论假设和更高阶段的扩展。为了避免高系统误差相关性偏见，我们使用协方差矩阵的cholesky分解，在$ b $ $ b $ - 物理现象学领域采用一种新技术。使用与JLQCD合作的非零后坐力的晶格QCD计算的其他输入，可提供明确定义的拟合结果，并降低CLN和BGL中的模型依赖性。在不同的配置之间获得的结果是一致的，最终为$ | v_ {cb} | $的更独立于模型的独家测量提供了一种方法。使用初步输入，发现发现$ \ Mathcal {f}（1）η_{\ rm ew} | v_ {cb} | $大约$（35.02 \ pm 0.29 \ pm 0.88） \ times 10^{ - 3} $在clnnohqs中。
We present a study of fits to exclusive $B^{0} \to D^{*-} \ell^{+} ν_{\ell}$ measurements for the determination of the Cabbibo-Kobayashi-Maskawa matrix element magnitude $|V_{cb}|$, based on the most recent Belle untagged measurement. Results are obtained with the Caprini-Lellouch-Neubert (CLN) and Boyd-Grinstein-Lebed (BGL) form factor parametrizations, with and without the inclusion of preliminary Lattice QCD measurements of form factors at non-zero hadronic recoil from the JLQCD collaboration. The CLN and BGL fits are also studied in different scenarios with reduced theoretical assumptions, and at higher order expansions, respectively. To avoid bias from high systematic error correlations we employ a novel technique in the field of $B$-physics phenomenology with a toy MC using a Cholesky decomposition of the covariance matrix. Using additional input from Lattice QCD calculations of form factors at non-zero recoil, in collaboration with JLQCD, allows for well-defined fit results with reduced model dependence in CLN and BGL. The results obtained are consistent between different configurations, ultimately providing a method for a more model-independent exclusive measurement of $|V_{cb}|$. Using preliminary inputs, $\mathcal{F}(1)η_{\rm EW}|V_{cb}|$ is found to be approximately $(35.02 \pm 0.29 \pm 0.88) \times 10^{-3}$ in BGL(2,2,2) and $(34.96 \pm 0.32 \pm 0.96) \times 10^{-3}$ in CLNnoHQS.
