Institute for Theoretical Particle Physics (TTP)

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preprints:2008:ttp08-22 [2016/03/15 20:38] (current)
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 +====== TTP08-22 Multi-Loop Calculations, Quark Masses and the Strong Coupling Constant ====== 
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 +<hidden TTP08-22  Multi-Loop Calculations, Quark Masses and the Strong Coupling Constant > The impact of multi-loop calculations on precise determinations of charm- and bottom-quark masses 
 + and the strong coupling constant is discussed. Recent $N^3LO$ calculations, combined with new  
 + precision data, lead to a significant reduction of the errors. The results of these analyses,  
 + $m_c(3~\mbox{GeV}) = 0.986(13)~\mbox{GeV}$, $m_b(10~\mbox{GeV}) = 3.609(19)~\mbox{GeV}$  
 + and $\alpha_s(M_Z)=0.1198(15)$ 
 + constitute the most precise and presently only $N^3LO$ determinations of these fundamental quantities. 
 + </hidden> 
 +|**J.H. K&uuml;hn**  |  
 +|**       Nucl. Phys. B (Proc.Suppl.), 183, 97-102, 2008 Contribution to "Loops and Legs in Quantum Field Theory, 9 th DESY Workshop on Elementary Particle Theory **  | 
 +| {{preprints:2008:ttp08-22.pdf|PDF}} {{preprints:2008:ttp08-22.ps|PostScript}}   | 
 +| |