Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV

BES collaboration

Chinese Physics C> 1995, Vol. 19> Issue(5) : 385-392

Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV

BES collaboration

Institute of High Energy Physics, Academia Sinica, Beijing 100039

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Abstract：
The τ+τ－ production has been studied in the data acquired by the Beijing Spectrometer (BES) at the comer-of-mass energy 4.03 GeV. Using a double-tagging technique, the decay τ~±→π~+π~-π~±υ_τhas been investigated. The branching ratios are determined to be Br(τ~±→a_1~±υ_τ→ρ~0π~±υ_τ, ρ~0→π~+π~-) = (7.3±0.5) % and Br(τ~±→ K~*±υτ→K_s~0π~±υτ, K_s~0→π~+π~-) = (6.0 ±1.5) ×10~(-3). From the Dalitz projection distribution, the dominant decay mode of ρπ in a~1 decay has been observed. Meanwhile,we have also found that the S-wave contribution dominates the a_1 decay. Applying the Kuhn model to fit the data, we have obtained the a_1 resonance parameters of m_a1=1.24±0.02 GeV and Γ_a1=0.57±0.07 GeV.

References

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BES collaboration. Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV[J]. Chinese Physics C, 1995, 19(5): 385-392.

BES collaboration. Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV[J]. Chinese Physics C, 1995, 19(5): 385-392. shu

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Received: 1900-01-01
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沈阳化工大学材料科学与工程学院沈阳 110142

Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV

Institute of High Energy Physics, Academia Sinica, Beijing 100039

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1995-05-05

Abstract: The τ+τ－ production has been studied in the data acquired by the Beijing Spectrometer (BES) at the comer-of-mass energy 4.03 GeV. Using a double-tagging technique, the decay τ~±→π~+π~-π~±υ_τhas been investigated. The branching ratios are determined to be Br(τ~±→a_1~±υ_τ→ρ~0π~±υ_τ, ρ~0→π~+π~-) = (7.3±0.5) % and Br(τ~±→ K~*±υτ→K_s~0π~±υτ, K_s~0→π~+π~-) = (6.0 ±1.5) ×10~(-3). From the Dalitz projection distribution, the dominant decay mode of ρπ in a~1 decay has been observed. Meanwhile,we have also found that the S-wave contribution dominates the a_1 decay. Applying the Kuhn model to fit the data, we have obtained the a_1 resonance parameters of m_a1=1.24±0.02 GeV and Γ_a1=0.57±0.07 GeV.

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