Not who you're looking for? Others named Axion: hypothetical elementary particle · washing-up liquid (UK), dishwashing liquid (US) · Greek mythology · genus of insects
“... In my view, after more than 25 years, the preferred solution to the strong CP problem still remains the idea that the Standard Model has an additional U(1) PQ symmetry. Such a solution, necessarily, predicts the existence of a concomitant axion.”
“It is pointed out that a global U(1) symmetry, that has been introduced in order to preserve the parity and time-reversal invariance of strong interactions despite the effects of instantons, would lead to a neutral pseudoscalar boson, the "axion," with mass roughly of order 100 keV to 1 MeV.”
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