Taming the higher power corrections in semileptonic B decays

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• 作者：Paolo Gambino^a ; ^{gambino@to.infn.it} ; Kristopher J. Healey^a ; Sascha Turczyk^b
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 December 2016
• 年：2016
• 卷：763
• 期：Complete
• 页码：60-65
• 全文大小：898 K
• 卷排序：763

文摘

We study the effect of dimension 7 and 8 operators on inclusive semileptonic B   decays and the extraction of |Vcb||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 non-perturbative parameters of the heavy quark expansion including for the first time the O(1/mb4,5) contributions. Higher power corrections appear to have a very small effect on the extraction of |Vcb||Vcb|, independently of the weight we attribute to the LLSA.