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. 2006 Jan 20;96(2):022002.
doi: 10.1103/PhysRevLett.96.022002. Epub 2006 Jan 18.

Observation of Bs production at the Y(5S) resonance

G Bonvicini  1 , D Cinabro, M Dubrovin, A Lincoln, A Bornheim, S P Pappas, A J Weinstein, D M Asner, K W Edwards, R A Briere, G P Chen, J Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, N E Adam, J P Alexander, K Berkelman, D G Cassel, V Crede, J E Duboscq, K M Ecklund, R Ehrlich, L Fields, L Gibbons, B Gittelman, 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, P U E Onyisi, J R Patterson, D Peterson, E A Phillips, J Pivarski, D Riley, A Ryd, A J Sadoff, H Schwarthoff, X Shi, M R Shepherd, S Stroiney, W M Sun, D Urner, T Wilksen, K M Weaver, M Weinberger, S B Athar, P Avery, L Breva-Newell, R Patel, V Potlia, H Stoeck, J Yelton, P Rubin, C Cawlfield, B I Eisenstein, G D Gollin, I Karliner, D Kim, N Lowrey, P Naik, C Sedlack, M Selen, E J White, J Williams, J Wiss, D Besson, T K Pedlar, D Cronin-Hennessy, K Y Gao, D T Gong, J Hietala, Y Kubota, T Klein, B W Lang, S Z Li, R Poling, A W Scott, A Smith, S Dobbs, Z Metreveli, K K Seth, A Tomaradze, P Zweber, J Ernst, K Arms, H Severini, S A Dytman, W Love, S Mehrabyan, J A Mueller, V Savinov, Z Li, A Lopez, H Mendez, J Ramirez, G S Huang, D H Miller, V Pavlunin, B Sanghi, I P J Shipsey, G S Adams, M Anderson, J P Cummings, I Danko, J Napolitano, Q He, H Muramatsu, C S Park, E H Thorndike, T E Coan, Y S Gao, F Liu, Y Maravin, M Artuso, C Boulahouache, S Blusk, J Butt, O Dorjkhaidav, J Li, N Menaa, R Mountain, R Nandakumar, K Randrianarivony, R Redjimi, R Sia, T Skwarnicki, S Stone, J C Wang, K Zhang, S E Csorna; CLEO Collaboration
Affiliations

Observation of Bs production at the Y(5S) resonance

G Bonvicini et al. Phys Rev Lett. .

Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have observed the Bs meson in e+e- annihilation at the Y(5S) resonance. We find 14 candidates consistent with Bs decays into final states with a J/psi or a Ds(*)- . The probability that we have observed a background fluctuation is less than 8 x 10(-10) . We have established that at the energy of the Y(5S) resonance Bs production proceeds predominantly through the creation of Bs*Bs* pairs. We find sigma(e+e- --> Bs*Bs*) = [0.11(-0.03))(+0.04)(stat) +/- 0.02(syst)]nb , and set the following limits: sigma(e+e- --> BsBs)/ sigma(e+ e- --> Bs*Bs*) <0.16 and [sigma(e+e- --> BsBs*) + sigma(e+e- --> Bs*Bs)]/sigma(e+e- -->Bs*Bs*) < 0.16 (90% C.L.). The mass of the Bs* meson is measured to be M(Bs*) = [5.414+/- 0.001(stat) +/- 0.003(syst)] GeV/c2 .

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