Why the angular distribution of the top decay lepton is unchanged by anomalous tbw couplings.
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➡️ The top quark is the heaviest known fundamental particle. Its average lifetime is about one order of magnitude smaller than the typical hadronisation time scale. This leads to decay of the top quark before the strong-interaction hadronisation process can wipe out its spin information. Thus, one can extract the top quark polarisation from the kinematical distributions of its decay products.
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