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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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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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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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

BES collaboration

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.