Question

Identify evidence for electroweak unification.

Short answer

The predictions of one massless, three massive bosons, and one massive spin=0 boson confirmed the theory.

Step-by-step solution

Definition of electroweak unification

The electroweak interaction is a fundamental force that represents the union of electromagnetic and weak nuclear interactions. Glashow, Weinberg, and Salam's work demonstrated that electromagnetic and weak nuclear forces can be understood as a single interaction.

Explanation

Salam, Ward, and Weinberg predicted the existence of three massive (with rough estimates, of the masses for W⁺, W^_ and Z⁰ ) and one massless spin 1 bosons while researching electroweak theory (a way of relating weak with electromagnetic interactions). All of these particles have been confirmed, along with their masses.

The Higgs boson, a spin 0 massive boson, was also predicted, and the particle has recently been confirmed.