$\alpha_s$ from an improved $\tau$ vector isovector spectral function
arxiv(2022)
摘要
After discussing difficulties in determining $\alpha_s$ 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 $2\pi +4\pi$ 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 $\alpha_s(m_\tau)=0.3077\pm 0.0075$, which corresponds to $\alpha_s(m_Z)=0.1171\pm 0.0010$. Finally, we comment on some of the shortcomings in the criticism of our approach by Pich and Rodriguez-Sanchez.
更多查看译文
关键词
improved vector isovector,spectral,$\alpha_sm_\tau$
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要