Mass Spectrum of a Meson Nonet is Linear
Abstract
It is argued that the mass spectrum of a meson nonet is linear, consistent with the standard Gell-Mann--Okubo mass formula and leading to an extra Gell-Mann--Okubo mass relation for the masses of the isoscalar states. This relation is shown to hold with an accuracy of up to 3\% for all well-established nonets. It also suggests a new qq assignment for the scalar meson nonet.
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