High Quality Content by WIKIPEDIA articles! In particle physics, W' and Z' bosons (or W-prime and Z-prime bosons) refer to hypothetical new gauge bosons that couple to Standard Model fermions via their isospin. They are named in analogy with the Standard Model W and Z bosons.W' bosons often arise in models with an extra SU(2) gauge group. SU(2) x SU(2) is spontaneously broken to the diagonal subgroup SU(2)W which corresponds to the electroweak SU(2). More generally, we might have n copies of SU(2), which are then broken down to a diagonal SU(2)W.

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