Editing Fundamental interaction (section)

==== Weak interaction ====
{{Main|Weak interaction}}
The ''weak interaction'' or ''weak nuclear force'' is responsible for some nuclear phenomena such as [[beta decay]]. Electromagnetism and the weak force are now understood to be two aspects of a unified [[electroweak interaction]] — this discovery was the first step toward the unified theory known as the [[Standard Model]]. In the theory of the electroweak interaction, the carriers of the weak force are the massive [[gauge boson]]s called the [[W and Z bosons]]. The weak interaction is the only known interaction that does not conserve [[parity (physics)|parity]]; it is left–right asymmetric. The weak interaction even [[CP-violation|violates CP symmetry]] but does [[CPT symmetry|conserve CPT]].