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    A Kaon decays into a Pion through the weak nuclear force. However, Pions are created through the strong interaction (e.g. proton-proton collision). So Pions are created through the weak AND strong interaction?

    If Pions were created through the strong interaction then shouldn't they be called strange particles as they are produced through the strong and decay through the weak force?
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    A particle is defined as strange if it contains a strange quark, which the pion does not.

    A strong interaction is one in which strangeness is conserved. A weak interaction is one in which it is not. Whether a particle is produced by strong or weak interaction does not determine whether it is strange or not, you must look at the composition of the particle.

    Kaons contain strange quarks, protons do not.

    If a kaon decays to a pion, that's a change in strangeness, due to a weak interaction.

    If a pion is produced from protons, there is no strangeness, strangeness (or lack of) is thus conserved, it's a strong interaction.
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    Thanks Phys981.

    From the current AQA specification it states: Strange particles as particles that are produced through the strong interaction and decay through the weak interaction (eg kaons). As you've said, this phenomena is due to a strange quark. So does this suggest that other particles can too be produced by the strong and decay through the weak but it is always the case with strange particles?
 
 
 

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