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arXiv 1606.06174hep-phhep-ex
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半轻子B衰变中的高次修正

Taming the higher power corrections in semileptonic B decays

Paolo Gambino, Kristopher J. Healey, Sascha Turczyk

摘要:

我们研究了7维和8维算符对包含半轻子B衰变和|Vcb|提取的影响。利用半轻子B衰变谱的矩和基于最低位态饱和近似(LLSA)的信息,我们对重夸克展开的非微扰参数进行了全局拟合,首次包括了O(1/mb^{4,5})的贡献.更高的功率校正似乎对|Vcb|的提取具有非常小的影响,与我们归因于LLSA的权重无关。

英文摘要:

We study the effect of dimension 7 and 8 operators on inclusive semileptonic B decays and the extraction of |Vcb|. Using moments of semileptonic B decay spectra and information based on the Lowest-Lying State saturation Approximation (LLSA) we perform a global fit of the nonperturbative parameters of the heavy quark expansion including for the first time the O(1/mb^{4,5}) contributions. Higher power corrections appear to have a very small effect on the extraction of |Vcb|, independently of the weight we attribute to the LLSA.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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