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preprints:1995:ttp95-17 [2016/03/17 11:03] (current)
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 +====== TTP95-17 HADRON RADIATION IN TAU PRODUCTION AND THE LEPTONIC Z BOSON DECAY RATE ====== 
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 +   <​hidden TTP95-17 ​ HADRON RADIATION IN TAU PRODUCTION AND THE LEPTONIC Z BOSON DECAY RATE > Secondary radiation of hadrons from a tau pair produced 
 + in electron positron collisions may constitute an 
 + ​important obstacle for precision measurements of 
 + the production cross section and of branching ratios. 
 + The rate for real and virtual radiation is calculated 
 + and various distributions are presented. 
 + For Z decays a comprehensive analysis is performed which 
 + ​incorporates real and virtual radiation of 
 + ​leptons. The corresponding results are also given for 
 + ​primary electron and muon pairs. 
 + ​Compact analytical formulae are presented for 
 + ​entirely leptonic configurations. 
 + ​Measurements of $Z$ partial decay rates which eliminate 
 + all hadron and lepton radiation are about 0.3\% to 0.4\% 
 + lower than totally inclusive measurements,​ a consequence of  
 + the ${\cal O}(\alpha^2)$ negative virtual corrections which  
 + are enhanced by the third power of a large logarithm.  
 + </​hidden>​ 
 +|**A.H. Hoang, J.H. K\"uhn and T. Teubner,​** ​ |  
 +|** Nucl. Phys. B455 3-20 1995  **  | 
 +| {{preprints:​1995:​ttp95-17.pdf|PDF}} {{preprints:​1995:​ttp95-17.ps|PostScript}} [[http://​arxiv.org/​abs/​hep-ph/​9507255|arXiv]] ​  | 
 +| |