====== TTP05-29 Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy ======
 
 
      <hidden TTP05-29  Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy > We include the new, five-loop, O(alpha_s^4) correction into the QCD
 sum rule used for the s-quark mass determination.  The pseudoscalar
 Borel sum rule is taken as a study case. The OPE for the correlation
 function with N^4LO, O(alpha_s^4) accuracy in the perturbative part,
 and with dimension <= 6 operators reveals a good convergence. We
 observe a significant improvement of stability of the sum rule with
 respect to the variation of the renormalization scale after including
 the O(alpha_s^4) correction.  We obtain the interval
 m_s(2 GeV)=105 \pm 6 \pm 7  MeV, which exhibits  about  2  MeV increase 
 of the central value, if the $O(alpha_s^4)
 terms are removed.  
 </hidden>
|**K.G. Chetyrkin  and  A.~Khodjamirian**  | 
|**  Eur. Phys. J.  C46 721-728 2006  **  |
| {{preprints:2005:ttp05-29.pdf|PDF}} {{preprints:2005:ttp05-29.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0512295|arXiv]] [[http://ttp.kit.edu/Progdata/ttp05/ttp05-29|Programs and Data]]   |
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