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arXiv 0812.2457hep-ph
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强子τ衰变数据中的α s

Alpha_s from hadronic tau decay data

Kim Maltman, Tzahi Yavin

摘要:

我们讨论了使用等矢量强子τ衰变数据和专门构造的求和规则来抑制与知之甚少的高维凝聚相关联的贡献。我们表明,第一,这种贡献的治疗问题影响早期的相关分析,第二,这些问题可以通过使用替代分析策略,在良好的理论控制。我们的结果,运行到n_f=5的区域,对应于alpha_s(M_Z^2)=0.1187(16),与最近更新的Z标度和其他高标度直接测定的电弱数据的整体拟合非常一致。

英文摘要:

We discuss the extraction of alpha_s using isovector hadronic tau decay data and sum rules constructed specifically to suppress contributions associated with poorly known higher dimension condensates. We show, first, that problems with the treatment of such contributions affect earlier related analyses and, second, that these problems can be brought under good theoretical control through the use of an alternate analysis strategy. Our results, run up to the n_f=5 regime, correspond to alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the recently updated global fit to electroweak data at the Z scale and other high-scale direct determinations.

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