Layman, I have a problem to understand the Higgs' motivation back then at 1964. The Higgs as I understand was postulated to explain how spontaneous breaking of gauge symmetry takes place in nature, which in turn explains why other elementary particles have mass. This all make perfect sense as of today...But, and here comes my lack of knowledge, at that time there was no W+/-, nor Z and no electroweak unification, so why to bother? What was the problem these paper tried to tackle? Was it 'only' to explain the mass mechanism via yet unknown vector bosons?...Or did they (the 3 groups) really aimed that high? Was it intentional or was it like pure curiosity 'Lie Groups' that then became a necessity? NB - no diminutive by pure curiosity, to the contrary.