Institute for Theoretical Particle Physics (TTP)
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preprints:2004:ttp04-28 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1
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 +====== TTP04-28 Strange Quark Mass from Tau Lepton Decays with O(\alpha_s^3) Accuracy ====== 
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 +   <hidden TTP04-28  Strange Quark Mass from Tau Lepton Decays with O(\alpha_s^3) Accuracy > The first complete calculation of the quadratic quark mass correction 
 + to the correlator of the two currents relevant for the 
 + strangeness-changing semihadronic tau-decay rate is presented  
 + including its real part at the four-loop level.  This allows to 
 + perform the extraction of the strange quark mass m_s from the decay 
 + width of the tau-lepton with  full  O(alpha_s^3) 
 + accuracy.  In agreement with previous estimates the newly computed 
 + alpha_s^3 term proves to be rather large. This justifies inclusion 
 + of the similarly estimated alpha_s^4 term in phenomenological 
 + analysis. Combined with an updated value of V_{us} and an 
 + ``'improved'' version of the renormalization group improvement of the 
 + perturbative series this leads to an increase of the central value of 
 + m_s by about 20% and a partial reduction of the theoretical 
 + uncertainty by about 50%.  
 + </hidden> 
 +|**P.A. Baikov, K.G. Chetyrkin and  J.H.K\"uhn**  |  
 +|**  Phys. Rev. Lett.  95 012003-1 2005  **  | 
 +| {{preprints:2004:ttp04-28.pdf|PDF}} {{preprints:2004:ttp04-28.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0412350|arXiv]]   | 
 +| |