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in particular, if the distance is more than about 1 fm?

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    $\begingroup$ Heads up for future, try to make the title about what your question is, rather than 'can you solve this question' or what the topic is. Here 'What happens when a quark-antiquark pair is separated by more than 1fm?' would work here. $\endgroup$ – Epideme Sep 28 at 11:44
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At about 1 fm separation the strong force will resist the separation of the quark-antiquark pair any further and create a new quark-antiquark pair between the two. Now you have 2 quark-antiquark pairs using on quark from the newly created pair on each one, shortening the separation once more.

This is a pretty good link of more or less exactly your question.

Hope that helps, and welcome to SE

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