1 the nucleon and antinucleon are each about 7 times more, Ask an Expert

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1. The nucleon and antinucleon are each about 7 times more massive than the pion. How is it even conceivable that the π could be a combination of nucleon and antinucleon?

2. Why is isospin, like SU(3), a broken symmetry, and how is it broken?

3. What is the hypercharge of the u, d, and s quarks?

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