Observation of $Υ (3 S) \to τ^{+} τ^{-}$ and Tests of Lepton Universality in $Υ$ Decays

29 January 2007

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 98 (5) , 052002
https://doi.org/10.1103/physrevlett.98.052002

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 (3 S) \to τ^{+} τ^{-}

, and precisely measure the ratio of branching fractions of

Υ (n S)

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

C P

-odd Higgs boson in the decay of the

Υ (1 S)

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This publication has 24 references indexed in Scilit:

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Observation ofΥ(3S)→τ+τ−and Tests of Lepton Universality inΥDecays

Abstract

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Observation of $Υ (3 S) \to τ^{+} τ^{-}$ and Tests of Lepton Universality in $Υ$ Decays