Àdàkọ: A quark of one flavour can transform into a quark of another flavour only through the weak interaction, one of the four fundamental interactions in particle physics. By absorbing or emitting a W boson, any up-type quark (up, charm, and top quarks) can change into any down-type quark (down, strange, and bottom quarks) and vice versa. Ẹ̀rọ ìyípadà àdàkọ yìí ló ń fa ìgbésẹ̀ rírẹdíò-átiwéká ti ìdàpọ̀ béta, nínú èyí tí neutron (n) "ń pín " sí proton (p), electron (e−) àti electron antutrino (νe) (wo àwòrán). Èyí wáyé nígbà tí ọ̀kan nínú àwọn quark inú neutron (e−) bá tú sí quark nípa gbígbé W− tí ó dà bí neutrino jáde, tí ó sì yí proton náà padà sí neutron (wud−).
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