All Problems

Elementary Particles

Problem 6.292

Find the mean path travelled by pions whose kinetic energy exceeds their rest energy η=1.2\eta=1.2 times. The mean lifetime of very slow pions is τ0=25.5 ns\tau_{0}=25.5 \mathrm{~ns}.

Reveal Answer
⟨l⟩=cτ0η(η+2)=15 m\langle l\rangle=c \tau_{0} \sqrt{\eta(\eta+2)}=15 \mathrm{~m}
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