本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
Using the ideas of quantum chromodynhekui ; +ksz8m(78jycsj et8, amics, would it be pbqh0ud842k wzvhz1 i1zlz9 n ;ossible to find particles made up of two quarks and no antiquarks? What about hi z0 4nkz1hubzw9z ;l1d28 vqtwo quarks and two antiquarks?
参考答案:
No, it is not possible to find a particle that is made up of two quarks and no antiquarks. First of all, this would give the particle a fractional charge, which has never been observed. Second, the “color” of the particle would not be “white”. To have a “white” quark, requires a quark of one color and an antiquark with the corresponding anticolor.
Yes, it is possible to find a particle that is made up of two quarks and two antiquarks. This combination of quarks/antiquarks would allow a particle to have a possible (non-fractional) charge and also allow it to be “white” in color. In Example 32-7, the comment is made that a $\pi^0$ is described as $\text{u}\bar{\text{u}} + \text{d}\bar{\text{d}}$.
本题详细解析:
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