Anti-deuteron production in Upsilon(nS) decays and the nearby continuum
Dec, 200616 pages
Published in:
- Phys.Rev.D 75 (2007) 012009
e-Print:
- hep-ex/0612019 [hep-ex]
PDG: anything
Report number:
- CLNS-06-1953,
- CLEO-06-3
Experiments:
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Abstract:
Using CLEO data, we study the production of the anti-deuteron, d-bar, in Upsilon(nS) resonance decays and the nearby continuum. The branching ratios obtained are B^dir(Upsilon(1S) --> d-bar X) = (3.36 +- 0.23 +- 0.25) x 10^-5, B(Upsilon(1S) --> d-bar X) = (2.86 +- 0.19 +- 0.21) x 10^-5, and B(Upsilon(2S) --> d-bar X) = (3.37 +- 0.50 +- 0.25) x 10^-5, where the `dir' superscript indicates that decays produced via re-annihilation of the b bbar 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% CL are given for B(Upsilon(4S) --> d-bar X) < 1.3 x 10^-5, and continuum production \sigma(e^+e^- --> d-bar X) < 0.031 pb. The Upsilon(2S) data is also used to extract a limit on chi_bJ --> d-bar X. The results indicate enhanced deuteron production in ggg, gg gamma hadronization compared to gamma* --> q qbar. Baryon number compensation is also investigated with the large Upsilon(1S) --> d-bar X sample.- 13.87.Fh
- 13.60.Rj
- 13.25.Gv
- electron positron: colliding beams
- electron positron: annihilation
- upsilon mesons: electroproduction
- upsilon mesons: hadronic decay
- antideuteron: production
- deuteron: production
- Upsilon(10020): radiative decay
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