Theory of Z boson decays

Details Theory of Z boson decays Theory of Z boson decays

1999-06-23

arxiv.org/abs/hep-ph/9906465v2

Rept.Prog.Phys.62:1275-1332,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

80 pages, 16 figures, accepted in Reports on Progress in Physics

Scientific paper

10.1088/0034-4885/62/9/201

The precision data on Z boson decays from LEP-I and SLC colliders are compared with the predictions based on the Minimal Standard Theory. The Born approximation of the theory is based on three most accurately known observables: G_mu -- the four fermion coupling constant of muon decay, m_Z -- the mass of the Z boson, and alpha(m_Z) -- the value of the running fine structure constant at the scale of m_Z. The electroweak loop corrections are expressed, in addition, in terms of the masses of higgs, m_H, of the top and bottom quarks, m_t and m_b, and of the strong interaction constant alpha_s(m_Z). The main emphasis of the review is focused on the one-electroweak-loop approximation. Two electroweak loops have been calculated in the literature only partly. Possible manifestations of new physics are briefly discussed.

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