THE RARE 𝐷𝑠-MESONS’ DECAYS INTO THREE CHARGED LEPTONS AND NEUTRINOS IN THE FRAMEWORK OF STANDARD MODEL

In the framework of the Standard Model, the values of branching ratios and differential distributions for four-lepton decays 𝐷𝑠− → µ+µ−¯ν𝑒 𝑒− and 𝐷𝑠− → 𝑒+𝑒−¯νµ µ− are found. In our calculations we took into account the processes of a virtual photon emission by 𝑠- and 𝑐-quarks of the 𝐷𝑠−-meson and bremsstrahlung. The emission of a virtual photon by 𝑠-quark have been described using the vector mesons dominance model.