Determination of Decay Width Error and Luminosity in ψ(2S) Scan

MO Xiao-Hu; ZHU Yong-Sheng

近期发现有不法分子冒充我刊与作者联系，借此进行欺诈等不法行为，请广大作者加以鉴别，如遇诈骗行为，请第一时间与我刊编辑部联系确认（《中国物理C》（英文）编辑部电话：010-88235947,010-88236950），并作报警处理。

本刊再次郑重声明：

（1）本刊官方网址为cpc.ihep.ac.cn和https://iopscience.iop.org/journal/1674-1137

（2）本刊采编系统作者中心是投稿的唯一路径，该系统为ScholarOne远程稿件采编系统，仅在本刊投稿网网址（https://mc03.manuscriptcentral.com/cpc）设有登录入口。本刊不接受其他方式的投稿，如打印稿投稿、E-mail信箱投稿等，若以此种方式接收投稿均为假冒。

（3）所有投稿均需经过严格的同行评议、编辑加工后方可发表，本刊不存在所谓的“编辑部内部征稿”。如果有人以“编辑部内部人员”名义帮助作者发稿，并收取发表费用，均为假冒。

《中国物理C》（英文）编辑部

2024年10月30日

Chinese Physics C> 2001, Vol. 25> Issue(12) : 1133-1139

Determination of Decay Width Error and Luminosity in ψ(2S) Scan

MO Xiao-Hu ^, ,
ZHU Yong-Sheng

Institute of High Energy Physics,CAS,Beijing 100039,China

Abstract
HTML
Reference
Related

PDF

Abstract：
The observed cross sections of processes e⁺e^－→e⁺e^－,μ⁺μ^－,π⁺π^－J/ψ and hadrons at 24 energy points in the vicinity of ψ(2S) resonance have been measured by BES(Beijing Spectrometer). The resonance cross sections for above four final states take the Breit-Wigner forms. By combining the cross sections of resonance part,continuum(QED or QCD) part and their interferences together with radiative corrections,and then convoluted with the energy spread of BEPC(Beijing Electron and Positron Collider),the χ² fit of these 4 observed cross sections with the assumption of e-μ-τ universality gives the decay widths and branching ratios of ψ(2S):Γ_t,Γ_μ,Γ_h,Γ_π+π－J/ψ,B_μ,B_h,B_π+π-J/ψ. This article mainly describes the methods for calculating the intregral luminosity and for determining the fitting errors of ψ(2S) decay widths and branching ratios in this scan experiment. The intregral luminosity for each energy point is calculated by using the data of e₊e_－ final state and the iteration method with assumption of lepton universality,that is B_e=B_μ . The errors of decay widths and branching ratios are determined by Monte Carlo sampling method.

References

[1]

. BES Collaboration.HEP NP ,1992,16(9):769—787(in Chinese);(BES合作组.高能物理与核物理,1992,16(9):769—787)BAI J Z et al.Nucl.Instr.Meth.1994,A344:319-334;GUO Y N .Nucl.Instr.Meth.,1996,A379:349—353;BAI J Z et al.Nucl.Instr.Meth.,2001,A458:627—6372. MO XiaoHu,ZHU YongSheng,WANG Ping.Measurement of ψ′Resonance Parameter.BES Memo,2001;Harris F A ,MO X H . B (ψ(2S)→π+π–J/ψ).BES Memo,20013. BES Collaboration.HEP NP ,1995,19:673—685(in Chinese);BAI J Z et al.Phys.Lett.,1995,B355:374—380.(BES合作组.高能物理与核物理,1995,19:673—685) 4. MINUIT Reference Manual,Version94.1(March1994)5. Particle Data Group.Eur.Phys.J.2000,C15:1;1998,C1:1;Phys.Rev.,1996,D54:1 6. ZHU Y S .Proposal for ψ(2S) Scan Experiment on BES .In:BES Collaborationed.BES 98(The Internal Collected Works),1998:303—308

[1]	Ai-Jun Ma , Ya Li , Wen-Fei Wang , Zhen-Jun Xiao . S-wave resonance contributions to B_(s)⁰→η_c(2S)π⁺π^-in the perturbative QCD factorization approach. Chinese Physics C, 2017, 41(8): 083105. doi: 10.1088/1674-1137/41/8/083105
[2]	GAO Tie-Jun , FENG Tai-Fu , ZHAO Shu-Min , KOU Li-Na . Comprehensive analysis of e⁺e^-→γη_c(2S). Chinese Physics C, 2013, 37(7): 073102. doi: 10.1088/1674-1137/37/7/073102
[3]	M. Ablikim et al (BESⅡ collaboration) . First evidence of ψ(2S)→Ω^-Ω⁺. Chinese Physics C, 2012, 36(11): 1040-1045. doi: 10.1088/1674-1137/36/11/002
[4]	Henryk Czyz , Agnieszka Grzelinska . Strong and electromagnetic J/ψ and ψ(2S) decays into pion and kaon pairs. Chinese Physics C, 2010, 34(6): 855-859. doi: 10.1088/1674-1137/34/6/039
[5]	WEI Dai-Hui , YANG Yong-Xu . Pseudoscalar mixing in J/ψ and ψ(2S) decay. Chinese Physics C, 2010, 34(12): 1785-1790. doi: 10.1088/1674-1137/34/12/002
[6]	GUO Yu-Ping , PING Rong-Gang , XIAO Zhen-Jun . Study of ππ final state interactions in ψ(2S)→π⁺π^－ J/ψ. Chinese Physics C, 2009, 33(4): 245-248. doi: 10.1088/1674-1137/33/4/001
[7]	JIANG Xing-Yu , FANG Shuang-Shi , ZHU Yu-Can , LU Gong-Ru . Pseudoscalar-Meson Mixing in ψ(2S)→VP Decays. Chinese Physics C, 2006, 30(8): 724-730.
[8]	MO Xiao-Hu , ZHU Yong-Sheng , YUAN Chang-Zheng , FU Cheng-Dong , LI Gang . Determination of ψ(2S) Total Number by Inclusive Hadronic Decay. Chinese Physics C, 2004, 28(5): 455-462.
[9]	FU Cheng-Dong , MO Xiao-Hu , ZHANG Jia-Wen , ZHU Yong-Sheng , YUAN Chang-Zheng , DONG Xin , DONG Liao-Yuan . Fast Reconstruction of ψ(2S) Data and Corresponding Quality Supervision. Chinese Physics C, 2003, 27(8): 653-658.
[10]	WANG Ping , YUAN Chang-Zheng , MO Xiao-Hu . Contribution of One-Photon Annihilation at ψ(2S) in e⁺e^－ Experiment. Chinese Physics C, 2003, 27(6): 465-473.
[11]	MO Xiao-Hu , ZHU Yong-Sheng . Correlated Data Fitting and Error Analysis in ψ(2S) Scan Experiment. Chinese Physics C, 2003, 27(6): 474-478.
[12]	PING Rong-Gang , JIANG Huan-Qing , ZOU Bing-Song . Finite Size Vertex Correction to the Strong Decay of η_c and χ_c States and a Determination of α_s(m_c). Chinese Physics C, 2002, 26(6): 563-568.
[13]	CUI XiangZong , GU YiFan , LI XinHua , HAN ShiWen . Measurement of Integrated Luminosity at ψ(2S) by Wide-Angle Bhabha Scattering. Chinese Physics C, 2000, 24(1): 4-10.
[14]	Li Xinhua , Gu Yifan . Comments on the Ratio of Hadronic Decay Rates of ψ(2S)to J/ψ. Chinese Physics C, 1998, 22(4): 293-298.
[15]	BES Collaboration . Abnormal Suppression of Vector-Tensor Decays of ψ(2S). Chinese Physics C, 1997, 21(1): 89-96.
[16]	BES Collaboration . Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π⁺π^－J/ψ. Chinese Physics C, 1996, 20(2): 97-106.
[17]	BES Collaboration . Study of ψ(2S)Decays into pπ and KK. Chinese Physics C, 1996, 20(6): 481-490.
[18]	BES Collaboration . New Suppression Mode of the ψ(2S) Hadronic Decay. Chinese Physics C, 1995, 19(1): 93-96.
[19]	BES Collaboration . Study of ψ(2S) Decay to τ Lepton Pairs. Chinese Physics C, 1995, 19(7): 577-584.
[20]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.

Access

Get Citation

MO Xiao-Hu and ZHU Yong-Sheng. Determination of Decay Width Error and Luminosity in ψ(2S) Scan[J]. Chinese Physics C, 2001, 25(12): 1133-1139.

MO Xiao-Hu and ZHU Yong-Sheng. Determination of Decay Width Error and Luminosity in ψ(2S) Scan[J]. Chinese Physics C, 2001, 25(12): 1133-1139. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2001-03-29
Revised: 1900-01-01

Article Metric

Article Views(3091)
PDF Downloads(687)
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, [email protected]

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Determination of Decay Width Error and Luminosity in ψ(2S) Scan

MO Xiao-Hu ^,
ZHU Yong-Sheng

Corresponding author: MO Xiao-Hu,

Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2001-03-29
Accepted Date: 1900-01-01
Available Online: 2001-12-05

Abstract: The observed cross sections of processes e⁺e^－→e⁺e^－,μ⁺μ^－,π⁺π^－J/ψ and hadrons at 24 energy points in the vicinity of ψ(2S) resonance have been measured by BES(Beijing Spectrometer). The resonance cross sections for above four final states take the Breit-Wigner forms. By combining the cross sections of resonance part,continuum(QED or QCD) part and their interferences together with radiative corrections,and then convoluted with the energy spread of BEPC(Beijing Electron and Positron Collider),the χ² fit of these 4 observed cross sections with the assumption of e-μ-τ universality gives the decay widths and branching ratios of ψ(2S):Γ_t,Γ_μ,Γ_h,Γ_π+π－J/ψ,B_μ,B_h,B_π+π-J/ψ. This article mainly describes the methods for calculating the intregral luminosity and for determining the fitting errors of ψ(2S) decay widths and branching ratios in this scan experiment. The intregral luminosity for each energy point is calculated by using the data of e₊e_－ final state and the iteration method with assumption of lepton universality,that is B_e=B_μ . The errors of decay widths and branching ratios are determined by Monte Carlo sampling method.