Strangeness can change by +1, 0 or -1 in weak interactions
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Conservation of Energy
The total energy in a partical is a combination of the rest mass energy and the kinetic energy
Etotal = E0 + Ekin = M0C^2 + 1/2mv^2
Kaons decay do not need strangeness conservation as it is decaying via the weak interaction.
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Hadron Stability
All mesons are unstable and decay quickly
The proton is the only stable baryon
Neutrons are unstable when they are not within an atomic nucleus with a half life of 611 seconds
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Additional Particles
Using only u, d and s quarks you can only make pions and kaons
You can make additional baryons by combining sets of three quarks (e.g. uuu, uus, dds, dss etc.)
You should be able to write down the subsequent properties of any baryon from its quark components even though they aren't explicitly taught on this course.
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