8. From Eq. 37-49, the Lorentz factor is γ= += +=11801592KmcMeV135 MeV..Solving Eq. 37-8 for the speed, we find γγ=−¡=−111122vcafwhich yields v= 0.778cor v= 2.33 ×108m/s. Now, in the reference frame of the laboratory, the lifetime of the pion is not the given τvalue but is “dilated.” Using Eq.
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