The minimum on mesons | Webel IT Australia

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:

Wikipedia: 'Charged mesons decay (sometimes through mediating particles) to form electrons and neutrinos.'

Wikipedia: 'Uncharged mesons may decay to photons.'

Wikipedia: 'Both of these decays imply that color is no longer a property of the byproducts.'

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

Wikipedia: 'Unlike leptons, quarks possess color charge, which causes them to engage in the strong interaction.'

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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From hadron to meson Package Diagrams and focus BDDs

Notes

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Snippets (quotes/extracts)

In particle physics, mesons are hadronic subatomic particles composed of one quark and one antiquark, bound together by strong interactions.

All mesons are unstable, with the longest-lived lasting for only a few hundredths of a microsecond.

Charged mesons decay (sometimes through mediating particles) to form electrons and neutrinos.

Uncharged mesons may decay to photons.

Both of these decays imply that color is no longer a property of the byproducts.

Unlike leptons, quarks possess color charge, which causes them to engage in the strong interaction.

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