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arXiv 0901.1434hep-ph
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α_s和τ强子宽度

alpha_s and the tau hadronic width

Matthias Jamin

摘要:

在从强子$τ$衰变中确定$α_s$时,重整化群重正化存在不同的选择:即固定阶微扰理论(FOPT)和轮廓改进微扰理论(CIPT)。这两种方法导致所得到的$α_s$存在系统性差异。高阶项的微扰系列,其中包括著名的结构从重正马龙模型的基础上,它被发现,而CIPT是无法占充分的mummed系列,FOPT顺利接近Borel和。采用该模型来确定$α_s$产生$α_s(M_τ)=0.316 \pm 0.006$,其在进化之后产生$α_s(M_Z) = 0.1180 \pm 0.0008$。

英文摘要:

Different choices exist for the renormalisation group resummation in the determination of $α_s$ from hadronic $τ$ decays: namely fixed-order (FOPT) and contour-improved perturbation theory (CIPT). The two approaches lead to systematic differences in the resulting $α_s$. On the basis of a model for higher-order terms in the perturbative series, which incorporates well-known structure from renormalons, it is found that while CIPT is unable to account for the fully resummed series, FOPT smoothly approaches the Borel sum. Employing the model to determine $α_s$ yields $α_s(M_τ)=0.316 \pm 0.006$, which after evolution leads to $α_s(M_Z) = 0.1180 \pm 0.0008$.

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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