Quarks

Quarks

1. Properties that are conserved in particle interactions

   • Charge is always conserved
     • In any particle interaction, the total charge after the interaction must = the total charge before the interaction
   • Baryon number is always conserved
     • Just like with charge in any particle interaction the baryon number after the interaction must = the baryon number before the interaction
   • Strangeness is conserved in strong interactions
     • The only way to change the type of quark is with the weak interaction, so in the strong interactions there has to be the same number of strange quarks at the beginning as at the end
   • Conservation of Lepton number.

2. Theres no such thing as a free quark.

   • Its not possible to get a particle by itself- quark confinement.

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