Elementary Particles (id: 34b3e9990)

本题目来源于试卷: Elementary Particles，类别为 IB物理学

[填空题]
Is it possible for a particleg3p/3,9zfw tr pg(rka t.l3 pbpu j:nkm0oc8v: o be both
(a) a lepton and a baryon?
(b) a baryon and a hadron? ----待选择----yesno 
(c) a meson and a quark? ----待选择----yesno 
(d) a hadron and a lepton?  ----待选择----yesno 
Explain.

参考答案:
空格1: yes  空格2: no  空格3: no 


本题详细解析:

(a) It is not possible for a particle to be both a lepton and a baryon.  A lepton is an elementary 

particle, not composed of quarks, while baryons are made up of three quarks.

(b) Yes, it is possible for a particle to be both a baryon and a hadron.  All baryons are spin = 1/2 hadrons.

(c) No, it is not possible for a particle to be both a meson and a quark.  A meson is made up of two quarks.

(d) No, it is not possible for a particle to be both a hadron and a lepton.  A lepton is an elementary particle, while a hadron is made up of three quarks.

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