本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
Quarks have spin $\frac{1}{2}$. How do you account for the fact that baryons have spin $\frac{1}{2}$ or $\frac{3}{2}$, and mesons have spin 0 or 1?
参考答案:
Baryons are made of a combination of three spin 1/2 quarks or spin -1/2 antiquarks. If a baryon has two quarks and one antiquark, or one quark and two antiquarks, then the magnitude of the spin will be 1/2. If a baryon has three quarks or three antiquarks, then the magnitude of the spin will be -1/2. If a meson has two quarks or two antiquarks, the magnitude of its spin will be 1. If a meson has a quark and an antiquark, the spin will be 0.
本题详细解析:
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