Weinberg, Glashow, Salaam (1979) were theoreticians, but their theories for electroweak unification had been validated in many experiments during the 1970's, especially weak neutral currents at CERN in 1973.
Higgs & Englert (2013) had to wait for 50 years for their theory to be validated. The ATLAS & CMS experimentalists who discovered the Higgs particle were passed over, but they outnumbered them ~1,000:1, and only up to 3 people are allowed to get the prize in one year.
https://physicsworld.com/a/overlooked-for-a-nobel-the-cern-p...
https://www.theguardian.com/science/life-and-physics/2013/oc...
However, Rubbia & van der Meer (1984) got the prize for discovering the W and Z (ultimate proof of electroweak unification) on behalf of the large CERN SPS collaboration.