Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-04
Phys.Atom.Nucl.67:2095-2100,2004; Yad.Fiz.67:2116-2122,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex file, 19 pages, 2 Postscript figure
Scientific paper
10.1134/1.1825534
The probability of W-boson decay into a lepton and a neutrino in a strong electromagnetic field is calculated. On the basis of the method for deriving exact solutions to relativistic wave equations for charged particles, an exact analytic expression is obtained for the partial W-decay width at an arbitrary value of the external field strength. It is found that, in the region of comparatively weak fields, field-induced corrections to the standard decay width of the W-boson in a vacuum are about a few percent. In these conditions at first we observe the decrease of the W-boson partial decay width with the increase of the external field strength parameter. At absolute minimum the W-width deviates from the corresponding vacuum value by a factor 0,926. Then with further augmentation of the background field intensity the W-boson decay width grows monotonously. In superstrong fields the partial W-width is greater than the corresponding one in vacuum in a dozen of times.
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