Anti-Deuteron Production in Upsilon(nS) Decays and the Nearby Continuum

D M Asner,D L Hartill,I Danko, Fenglei Liu,H Schwarthoff,J Hietala,G Bonvicini,L Brevanewell,K Berkelman,B K Heltsley,J Pivarski,G Tatishvili,D Croninhennessy,J Wiss,S W Gray,I Karliner,J Butt,N Lowrey,X Shi,J P Alexander,Reshma A Patel,A W Scott,R A Briere,K W Edwards,J E Duboscq,T Klein,Qiuming He,J Napolitano, Jianhua Li,P Zweber,G S Adams,T Wilksen,S A Dytman,D G Cassel,J Kandaswamy,I P J Shipsey,P U E Onyisi,G S Huang,R Poling,O Aquines,J R Patterson,E H Thorndike,E A Phillips,S Mehrabyan,M S Dubrovin,S Blusk,H Stoeck,R Mountain,T K Pedlar,V Pavlunin,P Avery,B I Eisenstein,C D Jones,R Redjimi,C Sedlack,A J Sadoff,T E Coan,Y S Gao,J P Cummings,B Xin,A Lincoln,Jonathan L Rosner,T Skwarnicki,V E Kuznetsov,W M Sun,Matthew J Anderson,A Ryd,M E Watkins,L Fields,J C Wang,K Y Gao,S E Csorna,J Ramirez,H Muramatsu,D Peterson,J Insler,C Cawlfield,J Ernst,D Hertz,K M Ecklund,D Besson,K Randrianarivony,V Potlia,D Riley,H Vogel,Nadia Adam,R Ehrlich,M R Shepherd,D T Gong,N Menaa,H Severini,E J White,Ajs Smith,L Gibbons,M Selen,D Cinabro,S Stone,A Lopez,B W Lang,Jin Chen,S B Athar,T Ferguson,S Nisar,H Mahlkekruger,V Savinov,S Dobbs,R Sia,P Naik,H Mendez,C S Park,Zhenhua Li,Y Kubota,M Artuso,Z Metreveli,D Kim,D H Miller,R S Galik,P Rubin,A Tomaradze,K K Seth,T O Meyer,W A Love,S Stroiney,B Sanghi,J Yelton,R Gray,D L Kreinick

PHYSICAL REVIEW D（2007）

引用 44|浏览37

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摘要

Using CLEO data, we study the production of the antideuteron, (d) over bar, in Upsilon(nS) resonance decays and the nearby continuum. The branching ratios obtained are B-dir(Upsilon(1S)->(d) over barX)=(3.36 +/- 0.23 +/- 0.25)x10(-5), B(Upsilon(1S)->(d) over barX)=(2.86 +/- 0.19 +/- 0.21)x10(-5), and B(Upsilon(2S)->(d) over barX)=(3.37 +/- 0.50 +/- 0.25)x10(-5), where the "dir" superscript indicates that decays produced via reannihilation of the b (b) over bar pair to a gamma(*) are removed from both the signal and the normalizing number of Upsilon(1S) decays in order to isolate direct decays of the Upsilon(1S) to ggg, gg gamma. Upper limits at 90% C.L. are given for B(Upsilon(4S)->(d) over barX)< 1.3x10(-5), and continuum production sigma(e(+)e(-)->(d) over barX)< 0.031 pb. The Upsilon(2S) data is also used to extract a limit on chi(bJ)->(d) over barX. The results indicate enhanced deuteron production in ggg, gg gamma hadronization compared to gamma(*)-> q (q) over bar. Baryon number compensation is also investigated with the large Upsilon(1S)->(d) over barX sample.

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