- #1
studnte
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if p_{tau}>>m_{tau} and we boost along the lab momentum of tau to go to its rest frame and defining this boost direction as Z-axis and looking at its decay product nu_tau and pi^- coming back-to-back along this Z-axis.
here, the question is whether the tau spin in the rest frame is the same as in lab frame?
here, the question is whether the tau spin in the rest frame is the same as in lab frame?