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

Abstract
HTML
Reference
Related

PDF

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

[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.

[1]	M. Ablikim , et al . Measurement of integrated luminosity and center-of-mass energy of data taken by BESⅢ at s=2.125 GeV. Chinese Physics C, 2017, 41(11): 113001. doi: 10.1088/1674-1137/41/11/113001
[2]	LI Xi-Huai , WANG Jian-Xiong . O(α_sv2) correction to J/ψ plus η_c production in e⁺e^- annihilation at s=10.6 Gev. Chinese Physics C, 2014, 38(4): 043101. doi: 10.1088/1674-1137/38/4/043101
[3]	^{M. Ablikim et al. (BESⅢ collaboration)} . Measurement of the integrated luminosities of the data taken by BESⅢ at s=3.650 and 3.773 GeV. Chinese Physics C, 2013, 37(12): 123001. doi: 10.1088/1674-1137/37/12/123001
[4]	K. I. Beloborodov , A. V. Berdyugin , A. A. Botov , V. B. Golubev , T. V. Dimova , V. P. Druzhinin , A. G. Kharlamov , D. P. Kovrizhin , I. A. Koop , A. A. Korol , S. V. Koshuba , A. E. Obrazovsky , E. V. Pakhtusova , D. A. Shtol , S. I. Serednyakov , Z. K. Silagadze , A. N. Skrinsky , Yu. A. Tikhonov , Yu. M. Shatunov , A. V. Vasil'ev . Study of the process e⁺e^－→π⁺π^－π⁰π⁰ at energies √s<1 GeV. Chinese Physics C, 2010, 34(6): 680-685. doi: 10.1088/1674-1137/34/6/012
[5]	XU Yi-Chun , SHAO Ming , ZHANG Zi-Ping . Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA. Chinese Physics C, 2007, 31(6): 538-542.
[6]	GUO Fen-Kun , SHENG Peng-Nian , JIAN Huan-Qing , PING Rong-Gang . Decay Υ(3S)→Υ(1S)π＋π－and a Possible bbqq State. Chinese Physics C, 2005, 29(12): 1121-1124.
[7]	CHI Shao-Peng , MO Xiao-Hu , ZHU Yong-Sheng . Measurement of the Integrated Luminosity at s(1/2)=3.650,3.686 GeV for the BES Detector. Chinese Physics C, 2004, 28(11): 1135-1140.
[8]	BES Collaboration . Measurement of Production Cross Section of D_s⁺D_s^－ in e⁺e^－ Annihilation at the Center-of-Mass Energy of s=4.03GeV. Chinese Physics C, 2001, 25(6): 465-475.
[9]	WANG Hui , SA BenHao , TAI An . Low PT Enhancement of Photon Production in 200 A GeV S+ An Collisions. Chinese Physics C, 2000, 24(3): 220-224.
[10]	QI XiangRong , HU HaiMing , LI XinHua , HUANG GuangShun , CHEN JiangChuan , HU Tao , JU Xin , LI Jin , MAO ZePu , XUE ShengTian , ZHENG ZhiPeng , ZHOU Li , ZHAO ZhengGuo . R Measurement around s=3.55GeV. Chinese Physics C, 2000, 24(7): 609-615.
[11]	Chen Esheng , Wang Qun , Xie Qubing , Chen Yan . Multiplicity of D^*± in e⁺e^－ Annihilation at s=29─35Gev. Chinese Physics C, 1998, 22(3): 234-240.
[12]	Liu Feng(Y) , Liu Feng . Revisit to Minijets in pp Collisions at s=630GeV. Chinese Physics C, 1998, 22(7): 631-638.
[13]	Qin Keyu . Calculation of Charged Particle Multiplicity Distribution for pp Collision at S=1800GeV. Chinese Physics C, 1996, 20(7): 635-638.
[14]	BES Collaboration . Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π⁺π^－J/ψ. Chinese Physics C, 1996, 20(2): 97-106.
[15]	BES Collaboration . Study of ψ(2S) Decay to τ Lepton Pairs. Chinese Physics C, 1995, 19(7): 577-584.
[16]	JING Guiru , REN Guoxiao . Angular Distributions of Projectile Fragments Produced in Collisions of 200A GeV ³²S Beam with Cu. Chinese Physics C, 1993, 17(11): 976-978.
[17]	Chen Esheng , Li Mingming . Yields of Charmed and Bottom Mesons in e⁺e^- Annihilations at √s=10-178 GeV. Chinese Physics C, 1991, 15(S4): 361-371.
[18]	CHEN E-Sheng , LI Ming-Ming . Yields of Charmed and Beautiful Mesons in e⁺e^－ Annihilation at s=10—178GeV 的e⁺e^-. Chinese Physics C, 1991, 15(11): 981-990.
[19]	REN Guo-Xiao . Measurement of Charge Changing Cross Sections of 200A GeV S and Fragments with Cu Target. Chinese Physics C, 1991, 15(12): 1063-1068.
[20]	Ren Guoxiao . Measurement of Charge-Changing Cross Sections of 200 A GeV S and Fragments with Cu Target. Chinese Physics C, 1991, 15(S4): 323-329.

Access

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 1900-01-01
Revised: 1900-01-01

Article Metric

Article Views(3407)
PDF Downloads(480)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.

HTML

Reference (1)

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

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

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

HTML

目录