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ism_chapter_41 - Chapter 41 Elementary Particles and the...

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1409 Chapter 41 Elementary Particles and the Beginning of the Universe Conceptual Problems 1 Similarities Differences Baryons and mesons are hadrons, i.e., they participate in the strong interaction. Both are composed of quarks. Baryons consist of three quarks and are fermions. Mesons consist of two quarks and are bosons. Baryons have baryon number +1 or 1. Mesons have baryon number 0. 2 Determine the Concept The muon is a lepton. It is a spin-½ particle and is a fermion. It does not participate in strong interactions. It appears to be an elementary particle like the electron. The pion is a meson. Its spin is 0 and it is a boson. It does participate in strong interactions and is composed of quarks. *3 Determine the Concept A decay process involving the strong interaction has a very short lifetime ( 10 23 s), whereas decay processes that proceed via the weak interaction have lifetimes of order 10 10 s. 4 ( a ) True ( b ) False. There are two kinds of hadrons-baryons, which have spin 2 1 (or , , 2 5 2 3 and so on), and mesons, which have zero or integral spin. 5 False. Mesons have zero or integral spins. 6 Determine the Concept A meson has 2 quarks, a baryon has 3 quarks. 7 Determine the Concept No; from Table 41-2 it is evident that any quark-antiquark combination always results in an integral or zero charge.
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