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Whether they truly become one force is unknown.","posed_since":"1974","precise":"Determine whether SU(3) x SU(2) x U(1) embeds in a simple group ($\\mathrm{SU}(5), \\mathrm{SO}(10), \\mathrm{E6}$) broken near $M_{\\mathrm{GUT}} \\sim 10^{15}\\ \\text{to}\\ 10^{16}\\,\\mathrm{GeV}$. In the SM the three couplings do not meet at a point; in the MSSM they meet at $\\sim 2 \\times 10^{16}\\,\\mathrm{GeV}$. An answer is an observation of a unification-specific effect such as proton decay with a branching pattern fixed by the group.","problem_ref":"b5a6eed4777c84a1bba368f984fc123270b9316dd4ad87ddd50aa6379d8d0ddd","references":"","settled_by":"Detection of proton decay in one or more channels with branching ratios matching a specific GUT.","status_note":"","title":"Do the SM gauge forces unify into a single 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