The Seesaw mechanism is a theoretical framework in particle physics that explains the small masses of neutrinos, which are fundamental particles involved in weak interactions. This mechanism is an extension of the Standard Model of particle physics and relates to the concept of lepton mixing and mass generation. In the Seesaw mechanism, it is proposed that there exist heavy neutrinos (sometimes called right-handed or sterile neutrinos) along with the known light neutrinos (the left-handed neutrinos).
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