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why the strong interaction

Hi everyone
I've come across a question recently that I couldn't figure out. The question was which type of interaction is responsible for the following decay:

pi+ meson plus a proton > Kaon+ plus unknown particle X

The answer was the strong nuclear force is responsible. I was wondering why it is the strong force which is responsible and not the weak force?

Thanks
ZanyZoya :smile:
Reply 1
I know the strong force is responsible for interactions between quarks hadrons etc, but for a proton changing into a neutron or vice versa the weak force is responsible?

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