# Question

(a) Show that the neutral pion cannot be composed solely of any pair of quarks in which one is an up quark (or an anti-up quark) and one is a down quark (or an anti-down quark).

(b) According to quantum theory, the can be thought of as a sum (superposition) of two different pairs of quarks/antiquarks. Each pair would be either both up or both down quarks. What are these two pairs?

(b) According to quantum theory, the can be thought of as a sum (superposition) of two different pairs of quarks/antiquarks. Each pair would be either both up or both down quarks. What are these two pairs?

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