Higher order QCD and quark mass corrections to the Z widths in the standard model |
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Authors: | Stephan Narison |
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Institution: | Laboratoire de Physique Mathématique, Université de Montpellier II Sciences et Techniques du Languedoc, Place E. Bataillon, Case 50, F-34095, Montpellier Cedex 5, France |
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Abstract: | We estimate, in the
scheme, the strenghts of the higher order QCD ( s2, s3) and quark mass (mf2, mf4, s(mf2, mf4)) corrections to the Z widths in the standard model (SM). Then, we give improved SM predictions of these widths. The observables ΓH/Γe and σH, which can be predicted and measured accurately are almost insensitive to the changes of the Higgs ( 40 GeV MH 1 TeV) and top quark (Mz Mt 230 GeV) masses. Then, they should be useful in the high precision tests of the SM> Improved estimates of some quantities related to the
width which are sensitive to the top quark mass are also given. |
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Keywords: | |
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