Upsilon Dipion Transitions At Energies Near The Upsilon(4s)

Scott Glenn,Yong Joon Kwon,A L Lyon,Sarah Roberts,E H Thorndike,C P Jessop,K Lingel,H Marsiske,M Perl, V Savinov, D Ugolini, X F Zhou,T E Coan,V Fadeyev,I Ya Korol Kov, Y Maravin,I Narsky, R Stroynowski,Jun Ye, T Wlodek,M Artuso,E Dambasuren,S Kopp,G C Moneti,R Mountain,S Schuh,T Skwarnicki, S Stone,A Titov, G H A Viehhauser,J C Wang,J Bartelt,S E Csorna,K W Mclean,Sz Marka,Zhi Xu, R Godang,Kisei Kinoshita,I C Lai,P Pomianowski,S Schrenk,G Bonvicini,D Cinabro,Richard L Greene, Lalith Perera,G J Zhou, Simon Chan,G Eigen, E Lipeles,J S Miller,M Schmidtler,A Shapiro, Werner M Sun,J Urheim,A J Weinstein,F Wurthwein,D E Jaffe,G E Masek,H P Paar,E M Potter,S Prell, V Sharma,D M Asner, J Gronberg,T S Hill,David Lange,Richard J S Morrison,Harry Norman Nelson,T K Nelson,D A Roberts,B H Behrens,W T Ford, A V Gritsan,H Krieg,J Roy,J M Smith, J P Alexander,R Baker,C Bebek,B E Berger,K Berkelman, V Boisvert,D G Cassel,D S Crowcroft,Michael Dickson,S Von Dombrowski, P S Drell,K M Ecklund,R Ehrlich,A Foland,P Gaidarev,R S Galik, L Gibbons,B Gittelman,S W Gray,D L Hartill, B K Heltsley,P I Hopman,J Kandaswamy,D L Kreinick,T K Lee,Yong Liu,N B Mistry,C R Ng,E Nordberg,M Ogg, J R Patterson,Dean E Peterson,D Riley, A Soffer,B Valantspaight, A Warburton,Christopher Ward,M Athanas, P Avery,C D Jones,M Lohner, C Prescott,A I Rubiera,J Yelton, J P Zheng,G Brandenburg,R A Briere,A Ershov,Y S Gao,D Y J Kim,Richard Wilson,H Yamamoto, T E Browder,Yong Li, J L Rodriguez,Saurabh K Sahu,T Bergfeld,B I Eisenstein,J Ernst,Gary E Gladding,G D Gollin,R M Hans, E D Johnson,I Karliner,M A Marsh,Mark Palmer,M Selen,J J Thaler, K W Edwards, A Bellerive,R Janicek,P M Patel,A J Sadoff,R Ammar, P Baringer,A Bean,D Besson,D Coppage,C Darling,R E Davis,S Kotov, Ilya Kravchenko,N Kwak, L W Zhou,Stuart B Anderson,Y Kubota,S J Lee,R Mahapatra,James A Oneill, R Poling,T Riehle,A J Smith,M S Alam,S B Athar,Ling Zhao,A H Mahmood,S Timm,F R Wappler, A Anastassov,J E Duboscq,K K Gan, T Hart,K Honscheid,H Kagan, R Kass,J K Lee,H Schwarthoff,Andreas Wolf,M M Zoeller,S J Richichi, H Severini, P Skubic, A Undrus,M Bishai,S L Chen,J Fast,J W Hinson,Narayanan Menon,D H Miller,E I Shibata, I P J Shipsey

PHYSICAL REVIEW D（1999）

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摘要

Using a 4.19 fb(-1) data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Y resonances at center of mass energies E-c.m. = 10.58 GeV and E-c.m. = 10.52 GeV. We obtain the 90% confidence level upper limits B(Y(4S) Y(2S)pi(+)pi(-))<3.9 x 10(-4) and B(Y(4S)-->Y(1S)pi(+)pi(-))< 1.2 x 10(-4). We also observe the transitions Y(3S)-->Y(1S) pi(+)pi(-), Y(3S)-->Y(2S)pi(+)pi(-), and Y(2S)-->Y(1S)pi(+)pi(-), from which we measure the cross sections for the radiative processes e(+)e(-)-->Y(3S) gamma and e(+)e(-)-->Y(2S) gamma. We obtain sigma(ee-->Y(3S)gamma) =(17.8 +/- 3.0 +/- 1.7) pb and sigma(ee-->Y(2S)gamma) = (15.5 +/- 1.3 +/- 1.4) pb at E-c.m. = 10.58 GeV, and sigma(ee-->Y(3S)gamma) = (27.3 +/- 5.0 +/- 2.6) pb and sigma(ee-->Y(2S)gamma) = (16.3 +/- 1.8 +/- 1.5) pb at E-c.m. = 10.52 GeV, which we compare with theoretical predictions. [S0556-2821(99)02303-6].

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关键词

confidence level,center of mass,cross section

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