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arXiv 0807.2020hep-lat
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再论alpha_s(M_Z)的实在格点确定

The Realistic Lattice Determination of alpha_s(M_Z) Revisited

K. Maltman, D. Leinweber, P. Moran, A. Sternbeck

摘要:

我们通过对短距离敏感的晶格观测量的微扰分析,结合新的晶格数据并对原始分析进行修改,重新审视了早期的alpha_s(M_Z)测定。我们主要研究两个高内禀尺度的观测量log(W_11)和log(W_12),以及一个低内禀尺度的观测量log(W_11)和log(W_12)(W_{12} /u_0^6),发现使用不同观测量提取的值之间的一致性得到改善,最终结果为alpha_s(M_Z)=0.1192(11),比早期结果高2 sigma,与最近的非晶格测定非常一致,此外,与HPQCD协作组进行的类似但不完全相同的再分析结果一致。两个重新分析之间的关系进行了讨论,侧重于两种方法的互补方面。

英文摘要:

We revisit the earlier determination of alpha_s(M_Z) via perturbative analyses of short-distance-sensitive lattice observables, incorporating new lattice data and performing a modified version of the original analysis. We focus on two high-intrinsic-scale observables, log(W_11) and log(W_12), and one lower-intrinsic scale observable, log(W_{12}/u_0^6), finding improved consistency among the values extracted using the different observables and a final result, alpha_s(M_Z)=0.1192(11), 2 sigma higher than the earlier result, in excellent agreement with recent non-lattice determinations and, in addition, in good agreement with the results of a similar, but not identical, re-analysis by the HPQCD Collaboration. A discussion of the relation between the two re-analyses is given, focussing on the complementary aspects of the two approaches.

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