论文标题
$α_s$来自改进的$τ$ vector Isovector光谱函数
$α_s$ from an improved $τ$ vector isovector spectral function
论文作者
论文摘要
After discussing difficulties in determining $α_s$ from tau decay due to the existence of Duality Violations and the associated asymptotic nature of the OPE, we describe a new determination based on an improved vector isovector spectral function, now based solely on experimental input, obtained by (i) combining ALEPH and OPAL results for $2π+4π$ and (ii) replacing $K^-K^0$ and higher-multiplicity独家模式贡献，均以先前使用蒙特卡洛进行估算，并具有$ k^-k^0 $的新实验性babar结果，以及$ e^+ e^ - $ cross pections所隐含的结果，以及更高型模式的CVC。我们发现$α_s（m_τ）= 0.3077 \ pm 0.0075 $，对应于$α_s（m_z）= 0.1171 \ pm 0.0010 $。最后，我们评论了Pich和Rodriguez-Sanchez对我们方法的批评中的一些缺点。
After discussing difficulties in determining $α_s$ from tau decay due to the existence of Duality Violations and the associated asymptotic nature of the OPE, we describe a new determination based on an improved vector isovector spectral function, now based solely on experimental input, obtained by (i) combining ALEPH and OPAL results for $2π+4π$ and (ii) replacing $K^-K^0$ and higher-multiplicity exclusive-mode contributions, both previously estimated using Monte Carlo, with new experimental BaBar results for $K^-K^0$ and results implied by $e^+ e^-$ cross sections and CVC for the higher-multiplicity modes. We find $α_s(m_τ)=0.3077\pm 0.0075$, which corresponds to $α_s(m_Z)=0.1171\pm 0.0010$. Finally, we comment on some of the shortcomings in the criticism of our approach by Pich and Rodriguez-Sanchez.
