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arXiv 1209.0450hep-phhep-exhep-lat
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基于NNLL阶向上求和规则的重整化群改进的底部质量

Renormalization Group Improved Bottom Mass from Upsilon Sum Rules at NNLL Order

Andre Hoang, Pedro Ruiz-Femenia, Maximilian Stahlhofen

摘要:

我们从非相对论性大n值厄普和规则和重整化群改进的次-次-首对数阶确定了底夸克质量。我们计算的vNRQCD形式主义内的理论的时刻和帐户的库仑奇异性的权力,以及对数项的总和的权力成比例的alpha_s ln(n)。重整化群的改进导致了理论矩的实质性稳定,与以前的固定阶分析相比,固定阶分析没有考虑对数alpha_s ln(n)项的系统处理,并允许可靠的单矩拟合。对于目前世界平均水平的强耦合(alpha_s(M_Z)= 0.1183 +- 0.0010)得到底部1 S质量的M_b^{1 S}=4.755 +- 0.057(pert)+- 0.009(alpha_s)+- 0.003(exp)GeV,m_b(m_b)= 4.235 +- 0.055(pert)+- 0.003(exp)GeV的底部MSbar质量,其中我们引用了扰动误差和不确定性的强耦合和实验数据。

英文摘要:

We determine the bottom quark mass from non-relativistic large-n Upsilon sum rules with renormalization group improvement at next-to-next-to-leading logarithmic order. We compute the theoretical moments within the vNRQCD formalism and account for the summation of powers of the Coulomb singularities as well as of logarithmic terms proportional to powers of alpha_s ln(n). The renormalization group improvement leads to a substantial stabilization of the theoretical moments compared to previous fixed-order analyses, which did not account for the systematic treatment of the logarithmic alpha_s ln(n) terms, and allows for reliable single moment fits. For the current world average of the strong coupling (alpha_s(M_Z) = 0.1183 +- 0.0010) we obtain M_b^{1S}=4.755 +- 0.057(pert) +- 0.009(alpha_s) +- 0.003(exp) GeV for the bottom 1S mass and m_b(m_b)= 4.235 +- 0.055(pert) +- 0.003(exp) GeV for the bottom MSbar mass, where we have quoted the perturbative error and the uncertainties from the strong coupling and the experimental data.

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