Z-boson decays in a strong electromagnetic field

Kurilin, A.V.

Автор: Kurilin A.V.
Журнал: Physics of Atomic Nuclei
Том: 72
Номер: 6
Год издания: 2009
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1034
Последняя страница: 1049
DOI: 10.1134/S1063778809060167
Аннотация: The probability of Z 0-boson decay to a pair of charged fermions in a strong electromagnetic field, Z 0 → 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 → f¯ f) is obtained at an arbitrary value of the parameter ϰ, 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 → 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.
Добавил в систему: Курилин Александр Владимирович

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