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e e , it is shown that – in the case of the unpolarized electron and positron – the final muons are also unpolarized but their spins prove to be strongly correlated. For the final system, the structure of triplet states is analyzed and explicit expressions for the components of the spin density matrix and correlation tensor are derived; besides, the formula for angular correlation at the decays of final muons and is obtained.

On the spin correlations of muons and tau leptons produced in the high-energy annihilation processes $e^+ e^- \rightarrow \mu^+ \mu^-, \tau^+ \tau^-$