Observation of Bs Production at the Υ(5S) Resonance

G. Bonvicini et al. (CLEO Collaboration)
Phys. Rev. Lett. 96, 022002 – Published 18 January 2006

Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have observed the Bs meson in e+e annihilation at the Υ(5S) resonance. We find 14 candidates consistent with Bs decays into final states with a J/ψ or a Ds(*). The probability that we have observed a background fluctuation is less than 8×1010. We have established that at the energy of the Υ(5S) resonance Bs production proceeds predominantly through the creation of Bs*B¯s* pairs. We find σ(e+eBs*B¯s*)=[0.110.03+0.04(stat)±0.02(syst)]nb, and set the following limits: σ(e+eBsB¯s)/σ(e+eBs*B¯s*)<0.16 and [σ(e+eBsB¯s*)+σ(e+eBs*B¯s)]/σ(e+eBs*B¯s*)<0.16 (90% C.L.). The mass of the Bs* meson is measured to be MBs*=[5.414±0.001(stat)±0.003(syst)]GeV/c2.

  • Figure
  • Figure
  • Received 12 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.022002

©2006 American Physical Society

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Vol. 96, Iss. 2 — 20 January 2006

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