First Observation of Upsilon(3S) --> tau tau and Tests of Lepton Universality in Upsilon Decays

Details First Observation of Upsilon(3S) --> tau tau and Tests of Lepton Universality in Upsilon Decays First Observation of Upsilon(3S) --> tau tau and Tests of Lepton Universality in Upsilon Decays

2006-07-13

arxiv.org/abs/hep-ex/0607019v2

Phys.Rev.Lett.98:052002,2007

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/

Scientific paper

10.1103/PhysRevLett.98.052002

Using data collected with the CLEO-III detector at the CESR e+e- collider, we report on a first observation of the decay of the Upsilon(3S) to tau tau, and precisely measure the ratio of branching fractions of Upsilon(nS),n=1,2,3 to tau tau and mu mu 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 Upsilon(1S).

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