# Differences

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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]] | | ||

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