arXiv · hep-ph/9801274
We discuss the ways to find CP violation in the decay of $τ^\pm\to ν_τ+ 3π$ from unpolarized as well as polarized $τ^\pm$.
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Yung Su Tsai. 1998-01-12. CP Violation in tau -> nu_tau + 3 pi. https://arxiv.org/abs/hep-ph/9801274
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