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Experimentalists have long sought a method that allows them to control asthey like the branching ratios of an unstable particle decay and direct somedecay to follow one specific desired channel without another. The powerfullaser could make this dream come true. In this Letter and within the frameworkof the standard electroweak model, we investigate theoretically the lasereffect on the branching ratios of different $Z$-boson decay modes bycalculating analytically the $Z$-boson decay into a pair of fermion-antifermion$(Z\rightarrow f\bar{f})$ in the presence of a circularly polarizedelectromagnetic field. It is found that, at high intensities, the $Z$-bosoncould only decay invisibly into neutrinos, and its decay into any other pair ofcharged fermions becomes impossible due to the increase in the effective massthat fermions acquire inside the electromagnetic field. The influence of thelaser frequency and intensity on the lifetime is also included in order toconfirm the surprising result obtained for the pion lifetime in a previouspaper [ Mouslih S \textit{et al} 2020 \textit{Phys. Rev. D} \textbf{102} 073006].

Laser effect on the final products of $Z$-boson decay