- #1

maximus123

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I have the following question

When a positive pion interacts with a proton, a kaon can be produced, along with another strange particle, as shown in this equation

[itex]\pi^++\textrm{P}\longrightarrow \textrm{K}^++\textrm{X} [/itex]

Circle the type of interaction shown

[itex] \textrm{Electromagnetic} \qquad\textrm{gravitational}\qquad\textrm{weak nuclear}\qquad\textrm{strong nuclear}[/itex]

I know this is a strong interaction as I have gotten used to recognising them. Given a reaction equation, if I was not sure what the interaction type, I would be able to work it out by seeing if the quark composition was conserved. If it was then we have the strong nuclear force. However in the above example. Since we have not been given the quark composition of the X particle, or whether or not its strange particle is strange or antistrange, that is not possible in this case. So how else could I know by looking at the above (incomplete) equation, that it is an example of a strong interaction?

Thanks a lot for any help