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2024年10月30日

Contribution of One-Photon Annihilation at ψ(2S) in e+e Experiment

  • The continuum one-photon annihilation at ψ(2S) in e+e experiment is studied. Such contributions to the measured final states ωπ0 and π+π at ψ(2S) mass are estimated by phenomenological models. It is found that these contributions must be taken into account in the determination of branching ratios of ψ(2S)→ωπ0 and ψ(2S)→π+π, as well as other electromagnetic decay modes. The study reaches the conclusion that in order to obtain the correct branching ratios on these decay modes at BES, at least 10pb-1of data below the ψ(2S) peak is needed.
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  • [1] . BES Collab.Nucl.Instr.Meth.,2001,A458:627—637;BES Collab. Nucl.Instr.Meth.,1994,A344:319—334;BES Collab.HEP NP ,1992,16(9):769—789(in Chinese)(BES合作组.高能物理与核物理,1992,16(9):769—789)2. LI J .Experimental Progress on Charmonium and Light Hadron Spectros copy.In:XVIIth International Symposiumon Lepton-Photon Interactions,Beijing,China,10—15,August,19953. Franklin M E B et al.Phys.Rev.Lett.,1983,51:9634. BES Collab.Phys.Rev.Lett.,1999,83:1918—19215. HOU Wei-Shu,Soni A .Phys.Rev.Lett.,1983,50:569;Brodsky S J,Karliner M.Phys.Rev.Lett.,1997,18:4682;Chaichian M,Trnqvist N A.Nucl.Phys.,1989,B323:75;Pinsky S S.Phys.Lett.,1990,B236:479;Karl G,Roberts W.Phys.Lett.,1984,B144:243;LI X Q,Bugg D V,ZOU B S.Phys.Rev.,1997,D55:1421;Gérard J M,Weyers J.Phys.Lett.,1999,B462:324;Feldmann T,Kroll P.Phys.Rev.,2000,D55:0740066. Harris F A .Recent ψ(2S)and ηc Results from BES.Report at ICHEP2002,Amsterdam,Holland,July24—31,20027. Rosner J .Phys.Rev.,1999,D60:074029;CHEN Yu-Qi,Braaten Eric.Phys. Rev.Lett.,1998,80:5060—50638. Baltrusaitis R M et al.Phys.Rev.Lett.,1986,56:2140;Adler J et al.Phys.Rev.Lett.,1988,60:89;CLEO c Collab.CLEO c and CESR c :A New Frontier of Weak and Strong Interactions.CLNS 01/17429. Suzuki M.Phys.Rev.,2001,D63:05402110. Chernyak V.e+ e– Collision from Φ to J/ψ.Talk Given at the International Workshop,March 1999,Novosibirsk11. Kuraev E A ,Fadin V S.Sov.J.Nucl.Phys.,1985,41:466—47212. Altarelli G,Martinelli G.CERN 8602(1986)47;NicrosiniO,Trentadue L.Phys.Lett.,1987,B196:55113. Berends F A ,Burgers G ,Neerven W L. Nucl.Phys., 1998,B297:429;Nucl.Phys.,1988,B304:92114. Tsai Y S.SLAC-PUB-3129,198315. Berends F A,Gastmans R.Electomagnetic Interactions of Hadrons,Volume 2.New York:edited by A .Donnanchine and G.Shaw,Pleunum Press,197816. BES Collab.HEP NP,1995,19(8):673—685(in Chinese);BES Collab.Phys.Rev.,1996,D53:20—34(BES合作组.高能物理与核物理,1995,19(8):673—685)17. Particle Data Group,Hagiwara K et al.Phys.Rev.,2002,D66:010001.18. Berends F A.Line Shape Z.In:CERN 89-08,edited by G Altarelli,R Kliess,C.Verzegnassi19. Fred F A.Recent Charmonium Results from BES.Report at DPF'99,Unversity of California,Los Angeles,Jun.5—19,199920. Brandelik R et al.Z .Phys.,1979,C1:23321. YE S W.Measurement and Study of Several Decay Channels of ψ′to VP and PP Dr.Thesis,Jan.1997(in Chinese)(叶树伟.ψ′的几种VP和PP模式衰变道的测量和研究.博士论文,1997.1)22. BES Collab.Phys.Lett.,2002,B550:24—3223. Achasov N N ,Kozhevnikov A A.e+ e–Collisionfrom to J/ψ.Talk Given at the International Workshop March 1999,Novosibirsk,hep-ph/990432624. GU Yi-Fan.Experimental Study on Charmonium Physics at Beijing ElectroPositron Collider,In:China Basic Science.2002.7—17(in Chinese)(顾以藩.北京正负电子对撞机上的粲夸克偶素物理实验研究.中国基础科学.2002.7—17)
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Get Citation
WANG Ping, YUAN Chang-Zheng and MO Xiao-Hu. Contribution of One-Photon Annihilation at ψ(2S) in e+e Experiment[J]. Chinese Physics C, 2003, 27(6): 465-473.
WANG Ping, YUAN Chang-Zheng and MO Xiao-Hu. Contribution of One-Photon Annihilation at ψ(2S) in e+e Experiment[J]. Chinese Physics C, 2003, 27(6): 465-473. shu
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Received: 2002-09-12
Revised: 1900-01-01
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Contribution of One-Photon Annihilation at ψ(2S) in e+e Experiment

    Corresponding author: WANG Ping,
  • Institute of High Energy Physics, CAS, Beijing 100039, China2 China Center of Advanced Science and Technology, Beijing 100080, China

Abstract: The continuum one-photon annihilation at ψ(2S) in e+e experiment is studied. Such contributions to the measured final states ωπ0 and π+π at ψ(2S) mass are estimated by phenomenological models. It is found that these contributions must be taken into account in the determination of branching ratios of ψ(2S)→ωπ0 and ψ(2S)→π+π, as well as other electromagnetic decay modes. The study reaches the conclusion that in order to obtain the correct branching ratios on these decay modes at BES, at least 10pb-1of data below the ψ(2S) peak is needed.

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