Antideuteron production in Υ(nS) decays and the nearby continuum

D. M. Asner,K. W. Edwards,R. A. Briere, Junjie Chen, T. Ferguson, G. Tatishvili,Hans J. Vogel,M. E. Watkins,Jonathan L. Rosner, N. E. Adam, J. P. Alexander, Karl Berkelman,D. G. Cassel,J. E. Duboscq,K. M. Ecklund, R. Ehrlich, L. Fields,R. S. Galik, L. K. Gibbons, R. Gray,S. W. Gray,D. L. Hartill,B. K. Heltsley, D. Hertz,C. D. Jones, J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov, H. Mahlke-Krüger,T. O. Meyer,Peter Onyisi,J. R. Patterson, D. Peterson,E. A. Phillips, J. Pivarski, D. Riley,Anders Ryd,A. J. Sadoff, H. Schwarthoff, X. Shi, S. Stroiney,Werner Sun, T. Wilksen, M. Weinberger,S. B. Athar, Paul Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, John Yelton, P. Rubin, C. Cawlfield,B. I. Eisenstein, I. Karliner,Dong-Hyun Kim, N. Lowrey,P. Naik, C. Sedlack, Mats A Selen,E. J. White, James E Wiss,M. R. Shepherd, D. Z. Besson,T. K. Pedlar,D. Cronin-Hennessy,K. Y. Gao,D. T. Gong, J. Hietala,Yuichi Kubota, T. Klein,B. W. Lang,Ron Poling,A. W. Scott,A. Smith,Sean A Dobbs, Z. Metreveli,Kamal K. Seth, Amiran Tomaradze, Peter K. Zweber, J. A. Ernst, Horst Severini,S. A. Dytman, W. Love, V. Savinov, O. Aquines,Z. Li,Alan D. Lopez, S. Mehrabyan, H. Mendez,J. E. Ramirez,G. S. Huang,D. H. Miller, V. Pavlunin, B. Sanghi, I. P.J. Shipsey, B. Xin,G. S. Adams, M. Anderson,J. P. Cummings

Physical Review D(2007)

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摘要
Using CLEO data, we study the production of the antideuteron, d, in {upsilon}(nS) resonance decays and the nearby continuum. The branching ratios obtained are B{sup dir}({upsilon}(1S){yields}dX)=(3.36{+-}0.23{+-}0.25)x10{sup -5}, B({upsilon}(1S){yields}dX)=(2.86{+-}0.19{+-}0.21)x10{sup -5}, and B({upsilon}(2S){yields}dX)=(3.37{+-}0.50{+-}0.25)x10{sup -5}, where the 'dir' superscript indicates that decays produced via reannihilation of the bb 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){yields}dX)<1.3x10{sup -5}, and continuum production {sigma}(e{sup +}e{sup -}{yields}dX)<0.031 pb. The {upsilon}(2S) data is also used to extract a limit on {chi}{sub bJ}{yields}dX. The results indicate enhanced deuteron production in ggg, gg{gamma} hadronization compared to {gamma}*{yields}qq. Baryon number compensation is also investigated with the large {upsilon}(1S){yields}dX sample.
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