1. Antideuteron production in Y(nS) decays and the nearby continuum
- Author
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Asner, D. M., Edwards, K. W., Briere, R. A., Chen, J., Ferguson, T., Tatishvili, G., Vogel, H., Watkins, M. E., Rosner, J. L., Adam, N. E., Alexander, J. P., Berkelman, K., Cassel, D. G., Duboscq, J. E., Ecklund, K. M., Ehrlich, R., Fields, L., Galik, R. S., Gibbons, L., Gray, R., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hertz, D., Jones, C. D., Kandaswamy, J., Kreinick, D. L., Kuznetsov, V. E., Mahlke-Kruger, H., Meyer, T. O., Onyisi, P. U. E., Patterson, J. R., Peterson, D., Phillips, E. A., Pivarski, J., Riley, D., Ryd, A., Sadoff, A. J., Schwarthoff, H., Shi, X., Stroiney, S., Sun, W. M., Wilksen, T., Weinberger, M., Athar, S. B., Avery, P., Breva-Newell, L., Patel, R., Potlia, V., Stoeck, H., Yelton, J., Rubin, P., Cawlfield, C., Eisenstein, B. I., Karliner, I., Kim, D., Lowrey, N., Naik, P., Sedlack, C., Selen, M., White, E. J., Wiss, J., Shepherd, M. R., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Gao, K. Y., Gong, D. T., Hietala, J., Kubota, Y., Klein, T., Lang, B. W., Poling, R., Scott, A. W., Smith, A., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Zweber, P., Ernst, J., Severini, H., Dytman, S. A., Love, W., Savinov, V., Aquines, O., Li, Z., Lopez, A., Mehrabyan, S., Mendez, H., Ramirez, J., Huang, G. S., Miller, D. H., Pavlunin, V., Sanghi, B., Shipsey, I. P. J., Xin, B., Adams, G. S., Anderson, M., Cummings, J. P., Danko, I., Napolitano, J., He, Q., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Coan, T. E., Gao, Y. S., Liu, F., Artuso, M., Blusk, S., Butt, J., Li, J., Menaa, N., Mountain, R., Nisar, S., Randrianarivony, K., Redjimi, R., Sia, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, K., Csorna, S. E., Bonvicini, G., Cinabro, D., Dubrovin, M., and Lincoln, A.
- Subjects
e(+)e(-) collisions ,deuteron production ,charged-particles ,rich detector ,cleo ,annihilation ,search ,energy ,model ,Astronomy & Astrophysics ,Physics, Particles & Fields - Abstract
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.
- Published
- 2007