Phys. Rev. D
75,
012009
(2007)
[9 pages]
Antideuteron production in Υ(nS) decays and the nearby continuum
D. M. Asner et al. CLEO Collaboration
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D. M. Asner1, K. W. Edwards1, R. A. Briere2, J. Chen2, T. Ferguson2, G. Tatishvili2, H. Vogel2, M. E. Watkins2, J. L. Rosner3, N. E. Adam4, J. P. Alexander4, K. Berkelman4, D. G. Cassel4, J. E. Duboscq4, K. M. Ecklund4, R. Ehrlich4, L. Fields4, R. S. Galik4, L. Gibbons4, R. Gray4, S. W. Gray4, D. L. Hartill4, B. K. Heltsley4, D. Hertz4, C. D. Jones4, J. Kandaswamy4, D. L. Kreinick4, V. E. Kuznetsov4, H. Mahlke-Krüger4, T. O. Meyer4, P. U. E. Onyisi4, J. R. Patterson4, D. Peterson4, E. A. Phillips4, J. Pivarski4, D. Riley4, A. Ryd4, A. J. Sadoff4, H. Schwarthoff4, X. Shi4, S. Stroiney4, W. M. Sun4, T. Wilksen4, M. Weinberger4, S. B. Athar5, P. Avery5, L. Breva-Newell5, R. Patel5, V. Potlia5, H. Stoeck5, J. Yelton5, P. Rubin6, C. Cawlfield7, B. I. Eisenstein7, I. Karliner7, D. Kim7, N. Lowrey7, P. Naik7, C. Sedlack7, M. Selen7, E. J. White7, J. Wiss7, M. R. Shepherd8, D. Besson9, T. K. Pedlar10, D. Cronin-Hennessy11, K. Y. Gao11, D. T. Gong11, J. Hietala11, Y. Kubota11, T. Klein11, B. W. Lang11, R. Poling11, A. W. Scott11, A. Smith11, S. Dobbs12, Z. Metreveli12, K. K. Seth12, A. Tomaradze12, P. Zweber12, J. Ernst13, H. Severini14, S. A. Dytman15, W. Love15, V. Savinov15, O. Aquines16, Z. Li16, A. Lopez16, S. Mehrabyan16, H. Mendez16, J. Ramirez16, G. S. Huang17, D. H. Miller17, V. Pavlunin17, B. Sanghi17, I. P. J. Shipsey17, B. Xin17, G. S. Adams18, M. Anderson18, J. P. Cummings18, I. Danko18, J. Napolitano18, Q. He19, J. Insler19, H. Muramatsu19, C. S. Park19, E. H. Thorndike19, T. E. Coan20, Y. S. Gao20, F. Liu20, M. Artuso21, S. Blusk21, J. Butt21, J. Li21, N. Menaa21, R. Mountain21, S. Nisar21, K. Randrianarivony21, R. Redjimi21, R. Sia21, T. Skwarnicki21, S. Stone21, J. C. Wang21, K. Zhang21, S. E. Csorna22, G. Bonvicini23, D. Cinabro23, M. Dubrovin23, and A. Lincoln23 (CLEO Collaboration)
1Carleton University, Ottawa, Ontario, Canada K1S 5B6
2Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
3Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
4Cornell University, Ithaca, New York 14853, USA
5University of Florida, Gainesville, Florida 32611, USA
6George Mason University, Fairfax, Virginia 22030, USA
7University of Illinois, Urbana-Champaign, Illinois 61801, USA
8Indiana University, Bloomington, Indiana 47405, USA
9University of Kansas, Lawrence, Kansas 66045, USA
10Luther College, Decorah, Iowa 52101, USA
11University of Minnesota, Minneapolis, Minnesota 55455, USA
12Northwestern University, Evanston, Illinois 60208, USA
13State University of New York at Albany, Albany, New York 12222, USA
14University of Oklahoma, Norman, Oklahoma 73019, USA
15University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
16University of Puerto Rico, Mayaguez, Puerto Rico 00681
17Purdue University, West Lafayette, Indiana 47907, USA
18Rensselaer Polytechnic Institute, Troy, New York 12180, USA
19University of Rochester, Rochester, New York 14627, USA
20Southern Methodist University, Dallas, Texas 75275, USA
21Syracuse University, Syracuse, New York 13244, USA
22Vanderbilt University, Nashville, Tennessee 37235, USA
23Wayne State University, Detroit, Michigan 48202, USA
Received 10 December 2006; published 24 January 2007
Using CLEO data, we study the production of the antideuteron, d̅ , in Υ(nS) resonance decays and the nearby continuum. The branching ratios obtained are Bdir(Υ(1S)→d̅ X)=(3.36±0.23±0.25)×10-5, B(Υ(1S)→d̅ X)=(2.86±0.19±0.21)×10-5, and B(Υ(2S)→d̅ X)=(3.37±0.50±0.25)×10-5, where the “dir” superscript indicates that decays produced via reannihilation of the bb̅ pair to a γ* are removed from both the signal and the normalizing number of Υ(1S) decays in order to isolate direct decays of the Υ(1S) to ggg, ggγ. Upper limits at 90% C.L. are given for B(Υ(4S)→d̅ X)<1.3×10-5, and continuum production σ(e+e-→d̅ X)<0.031 pb. The Υ(2S) data is also used to extract a limit on χbJ→d̅ X. The results indicate enhanced deuteron production in ggg, ggγ hadronization compared to γ*→qq̅ . Baryon number compensation is also investigated with the large Υ(1S)→d̅ X sample.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.75.012009
DOI:
10.1103/PhysRevD.75.012009
PACS:
13.87.Fh, 13.25.Gv, 13.60.Rj
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