Determination of |V_cb| using N3LO perturbative corrections to Γ(B→Xclν) and 1S masses
Determination of |V_cb| using N3LO perturbative corrections to Γ(B→Xclν) and 1S masses
复制标题
使用 N3LO 微扰校正 Γ(B→Xclν) 和 1S 质量确定 |V_cb|
DOI：
10.1016/j.physletb.2022.137068
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发表时间：
2022
影响因子：
4.4
通讯作者：
Hiromasa Takaura
中科院分区：
文献类型：
--
作者：
Yuuki Hayashi;Yukinari Sumino;Hiromasa Takaura
我们用三阶微扰级数确定了包含性半轻子B衰变宽度和底原子1S态质量的|Vcb|。我们用ηb(1 S)和ϒ(1 S)的质量作为短距离质量，指出这两个1s质量方案在|Vcb|上有很大的差别。这是我们确定的主要错误，并源于不能从理论上描述观察到的Bottomoni1S态的质量分裂。我们还研究了O(ΛMS‾2)非微扰效应对当前微扰精度的意义。我们的结果|Vcb|=0.0425(11)与由包含性衰变确定的Pdg值一致，误差略大。
We determine| V c b| using the third-order perturbative series for the inclusive semileptonic B decay width and for the masses of the bottomonium 1S states. We use the masses of η b (1 S) and ϒ (1 S) as short-distance masses and point out that there is a sizable difference of| V c b| between the two 1S mass schemes. This is the dominant error of our determination and stems from insufficiency to describe theoretically the observed mass splitting of the bottomonium 1S states. We also study the significance of the O (Λ MS‾ 2) non-perturbative effects in HQET with respect to the current perturbative accuracy. Our result| V c b|= 0.0425 (11) is consistent with the PDG value determined from the inclusive decays and has a slightly larger error.