The minimum on mesons

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The strategy used so far for particles vs antiparticles is to use an abstract base that is not declared to be «matter» or «antimatter». So the Meson redefines valenceQuark to have multiplicity [2] and to be the derived {union} of the {subsets} quark1[1] and quark2[1], where it is not known (and does not matter here) which one is «matter» or «antimatter». All that does matter (excuse the pun) is the constraint in OCL:

quark1.isAntiMatter implies not quark2.isAntiMatter and quark2.isAntiMatter implies not quark1.isAntiMatter

These snippets indicate a little about the decays, but not enough to flesh them out yet:

Apparently any ParticleDecay can have byproducts of type Particle. To resolve the concept 'color' a little help is borrowed from a snippet about quarks:

Finally, we are not told much yet about what it means for a particle to have 'lived', but a placeholder value property lifetime is introduced in block Particle, with a ValueType ParticleLifetime that could be used later to document how it is defined or measured.

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