  In this paper, we have investigated the charged kaons decay at the lowest
order in the presence of a circularly polarized laser field. To be more
precise, we have examined the leptonic decay of both positive (matter) and
negative (antimatter) kaon which weakly decay via the exchange of $W$ boson.
Indeed, we have derived the expression of the leptonic decay width, the
leptonic branching ratio, the leptonic ratio and the charged kaon lifetime by
using the decay matrix approach. In addition, by using numerical computation,
we have presented and discussed how the laser field influences these physical
quantities. Moreover, we have analyzed the effect of the laser field on the
parameter associated with the CPT symmetry. Then, we have concluded that, in
the presence of an electromagnetic field and based on this CPT symmetry
parameter, it is possible to control the dominance of matter over antimatter or
vice-versa by applying an external field to either violate or conserve the CPT
symmetry.
