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preprints:2002:ttp02-27 [2016/03/15 20:39] (current)
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 +====== TTP02-27 Determination of $\alpha_s$ and the charm and bottom quark masses from recent measurements of $R(s)$ ====== 
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 +<hidden TTP02-27 ​ Determination of $\alpha_s$ and the charm and bottom quark masses from recent measurements of $R(s)$ > Recent experimental data for the total cross 
 + ​section $\sigma(e^+e^-\to\mbox{hadrons})$ are compared 
 + with the up-to-date 
 + ​theoretical prediction of perturbative QCD for those energies where 
 + ​perturbation theory is reliable. This allows for a  
 + ​determination of the strong coupling 
 + ​$\alpha_s^{(4)}(5~\mbox{GeV})=0.235\pm0.047$. 
 + The precise data from the charm threshold region, 
 + when combined with the recent evaluation of moments with three loop 
 + ​accuracy,​ lead to a direct determination of the short distance 
 + ​$\overline{\rm MS}$ charm quark mass $m_c(m_c)=1.304(27)$. 
 + ​Applying the 
 + same approach to the bottom quark we obtain $m_b(m_b)=4.191(51)$~GeV.  
 + </​hidden>​ 
 +|**J.H. K\"uhn and M. Steinhauser** ​ |  
 +|**  Proceedings of ICHEP 2002, Elsevier Science B.V., Bentvelsen et al. Eds.    539-541 2002  **  | 
 +| {{preprints:​2002:​ttp02-27.pdf|PDF}} {{preprints:​2002:​ttp02-27.ps|PostScript}} ​  | 
 +| |