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Hayasaka, K.; Huang, Z.; Kou, E.
The European physical journal. C, Particles and fields, 06/2021, Letnik: 81, Številka: 6Journal Article
We propose to measure the τ - → K 1 - ν τ → ( K - ω ) ν τ → ( K - π + π - π 0 ) ν τ decay in order to determine the K 1 axial vector mixing angle θ K 1 . We derive, for the first time, the differential decay rate formula for this decay mode. Using the obtained result, we perform a sensitivity study for the Belle (II) experiment. We will show that the K - π + π - π 0 spectrum of the τ - → K 1 - ν τ → ( K - ω ) ν τ → ( K - π + π - π 0 ) ν τ decay can discriminate the two solutions θ K 1 = ∼ 30 ∘ or ∼ 60 ∘ observed in the other measurements.
