本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
The $\Delta$ baryon has spin $\frac{3}{2}$, baryon number 1, and charge states $Q = +2, +1, 0, -1$. Why is there no charge state $Q = -2$?
参考答案:
Since the $\Delta$ baryon has $B = 1$, it must be made up of three quarks. Since the spin of the $\Delta$ baryon is $3/2$, none of these quarks can be antiquarks. Thus, since the charges of quarks are either $+2/3$ or $-1/3$, the only charges we can create with this combination are $q = -1\ (=-1/3 - 1/3 - 1/3)$, $0\ (= +2/3 - 1/3 - 1/3)$, $+1\ (= +2/3 + 2/3 - 1/3)$, and $+2\ (= +2/3 + 2/3 + 2/3)$.
本题详细解析:
暂无
| 
