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preprints:1997:ttp97-05 [2016/03/17 11:03] (current)
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 +====== TTP97-05 Two-loop QCD corrections to semileptonic b decays at maximal recoil ====== 
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 +   <hidden TTP97-05  Two-loop QCD corrections to semileptonic b decays at maximal recoil > We present a complete ${\cal O}(\alpha_s^2)$ correction to the 
 + differential width of the inclusive semileptonic decay $b\to cl\nu_l$ 
 + at the kinematical point of vanishing invariant mass of the leptons, 
 + $q^2=0$.  Together with the recently computed ${\cal O}(\alpha_s^2)$ 
 + correction at the upper boundary of the lepton invariant mass 
 + spectrum, this new information permits an estimate of the ${\cal 
 + O}(\alpha_s^2)$ effect in the total inclusive semileptonic decay width 
 + $b\to cl\nu_l$. We argue that the non-BLM part of the ${\cal 
 + O}(\alpha_s^2)$ correction gives at most $1\%$ correction to the 
 + inclusive semileptonic decay width $b\to cl\nu_l$. This significantly 
 + improves the credibility of extracting $|V_{cb}|$ from the inclusive 
 + semileptonic decays of the $b$-hadrons. 
 +  
 + </hidden> 
 +|**Andrzej Czarnecki and Kirill Melnikov**  |  
 +|** Phys. Rev. Lett. 78 3630 1997  **  | 
 +| {{preprints:1997:ttp97-05.pdf|PDF}} {{preprints:1997:ttp97-05.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9703291|arXiv]]   | 
 +| |