Observation of Υ(2S)ηΥ(1S) and Search for Related Transitions

Q. He et al. (CLEO Collaboration)
Phys. Rev. Lett. 101, 192001 – Published 3 November 2008

Abstract

We report the first observation of Υ(2S)ηΥ(1S), with a branching fraction B=(2.10.6+0.7(stat)±0.3(syst))×104 and a statistical significance 5.3σ. Data were acquired with the CLEO III detector at the CESR e+e symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 104 are B(Υ(2S)π0Υ(1S))<1.8, B(Υ(3S)ηΥ(1S))<1.8, B(Υ(3S)π0Υ(1S))<0.7, and B(Υ(3S)π0Υ(2S))<5.1.

  • Figure
  • Figure
  • Received 18 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.192001

©2008 American Physical Society

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Vol. 101, Iss. 19 — 7 November 2008

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