Abstract
Using data collected with the CLEO III detector at the CESR e+e- collider, we report on a first observation of the decay Υ(3S)→τ+τ-, and precisely measure the ratio of branching fractions of Υ(nS), n=1, 2, 3, to τ+τ- and μ+μ- final states, finding agreement with expectations from lepton universality. We derive absolute branching fractions for these decays, and also set a limit on the influence of a low mass CP-odd Higgs boson in the decay of the Υ(1S).
| Original language | English (US) |
|---|---|
| Article number | 052002 |
| Journal | Physical review letters |
| Volume | 98 |
| Issue number | 5 |
| DOIs | |
| State | Published - 2007 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
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