Pionium, a bound state of two oppositely-charged pions, is useful for exploring the strong interaction.
2.
Pionium, a bound state of two oppositely-charged pions, is interesting for exploring the strong interaction.
3.
Understanding bound states of pionium and protonium is important in order to clarify notions related to exotic hadrons such as mesonic molecules and pentaquark states.
4.
Understanding bound states of hadrons such as pionium and protonium is also important in order to clarify notions related to exotic hadrons such as mesonic molecules and pentaquark states.
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