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- W2079874095 abstract "The probability of Z 0-boson decay to a pair of charged fermions in a strong electromagnetic field, Z 0 → $$ bar f $$ f, is calculated. On the basis of a method that employs exact solutions to relativistic wave equations for charged particles, an analytic expression for the partial decay width Γ(ϰ) = Γ(Z 0 → $$ bar f $$ f) is obtained at an arbitrary value of the parameter ϰ = $$ eM_Z^{ - 3} sqrt { - (F_{mu nu } q^nu )^2 } $$ , which characterizes the external-field strength. The total Z 0-boson decay width in an intense electromagnetic field, Γ Z (ϰ), is calculated by summing these results over all known generations of charged leptons and quarks. It is found that, in the region of relatively weak fields (ϰ < 0.06), the field-induced corrections to the standard Z 0-boson decay width in a vacuum do not exceed 2%. As ϰ increases, the total decay width Γ Z (ϰ) develops oscillations against the background of its gradual decrease to the absolute-minimum point. At ϰmin = 0.445, the total Z 0-boson decay width reaches the minimum value of Γ Z (ϰmin) = 2.164 GeV, which is smaller than the Z 0-boson decay width in a vacuum by more than 10%. In the region of superstrong fields (ϰ > 1), Γ Z (ϰ) grows monotonically with increasing external-field strength. In the region ϰ > 5, the t-quark-production process Z 0 → $$ bar t $$ t, which is forbidden in the absence of an external field, begins contributing significantly to the total decay width of the Z 0 boson." @default.
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- W2079874095 date "2009-06-01" @default.
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- W2079874095 title "Z 0-boson decays in a strong electromagnetic field" @default.
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- W2079874095 doi "https://doi.org/10.1134/s1063778809060167" @default.
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