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

  • 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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  • [1] ParticleDataGroup,Phys.Rev.,D45;(1992).[2]BESCollaboration,Nucl.Instr. Meth.in Phys.Res,A344(994)319.[3]陈少敏,Thevτ Mass and Helicity Measurementat BES,第二届BES年会,北京,1993年7月。[4]J.H.Kuhn,F.Wagner,Nucl.Phys,B236(1984)16.[5]S.Jadach,Z.Was,Comp.Phys.Commun.,36(1985)191.S.Jadach,J.H.Kuhn.Z.Was,Comp.PhysCommun.,64(1990)275.S.Jadach,B.F.L.Ward,Z.Was,Comp Phys.Commun.66(1991)276.[6]B.Andersonetal.,Phys.Rep,97(1983)31;Phy.Letts.,B199(1987)191.[7]E.Eichtenletal,Phys.RevLett,36(1976)132.[8]郑志鹏,漆纳丁,北京谱仪最新物理结果,第一届北极圈加速器和物理的未来发展讨论会会刊,芬兰,萨里塞卡,1994年8月。[9]童国梁,李勇等,Measurement of the BRof Decayτ-→a1-vτ(π+π-π-),第三届BES年会,杭州,1994年7月。[10]J.H.Kuhn,A.Santamaria;Z.Phys,C48(1990)445.
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Get Citation
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
Revised: 1900-01-01
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Study of the Decay τ±→π+π-π±υτ at s=4.03 GeV

  • Institute of High Energy Physics, Academia Sinica, Beijing 100039

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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