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    MSc particle physics revision question - angle of muon from pion decay

    Thank you vela
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    MSc particle physics revision question - angle of muon from pion decay

    I am trying to revise for PhD, going over MSc work. Could anyone help me with this question? Homework Statement A pion traveling at speed β(=v/c) decays into a muon and a neutrino, π→μ + \nu. If the neutrino emerges at 90° to the original pion direction at what angle does the muon come off...