Simple Formulae for Sin^2 theta_eff^lept, M_W, Gamma_l, and their Physical Applications

Details Simple Formulae for Sin^2 theta_eff^lept, M_W, Gamma_l, and their Physical Applications Simple Formulae for Sin^2 theta_eff^lept, M_W, Gamma_l, and their Physical Applications

2002-03-23

arxiv.org/abs/hep-ph/0203224v1

Phys.Rev. D65 (2002) 113002

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 1 figures

Scientific paper

10.1103/PhysRevD.65.113002

The calculation of the partial widths of the Z boson in the effective scheme is discussed. Simple formulae for Sin^2 theta_eff^lept, M_W, and Gamma_l in the on-shell, MS, and effective renormalization schemes are presented. Their domain of validity extends to low M_H values probed by current experiments, and to the range of Delta alpha_hadr results from recent calculations. Physical applications of these formulae are illustrated. A comparative analysis of the above mentioned schemes is presented. The paper includes a discussion of the discrepancy of the Sin^2 theta_eff^lept values derived from the leptonic and hadronic sectors and of the shortcomings of theoretical error estimates of Sin^2 theta_eff^lept based solely on those affecting M_W.

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