Y boson
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In particle physics, the Y boson, like the X boson, is a very massive hypothetical elementary particle, similar to the W and Z bosons of the Standard Model.
The properties of the Y boson vary according to the grand unification theory in which the Y bosons are predicted. In most such theories, the Y boson couples quarks to leptons, allowing violation of the conservation of baryon number and thus proton decay.ru: Y бозон

