Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-07
Nucl.Phys.B455:3-20,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, LaTeX (18 uuencoded ps-figures included as an extra file) The complete paper, including figures, is also available v
Scientific paper
10.1016/0550-3213(95)00457-4
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.
Hoang Andre H.
Kuhn Johann H.
Teubner Thomas
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