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

Preprint

27 March 2007

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0607019

Abstract

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).

Keywords

LEPTON UNIVERSALITY
BRANCHING FRACTIONS
DECAYS USING
TAU TAU
UPSILON

All Related Versions

Version 1, 2006-07-13, ArXiv
Version 2, 2007-03-27, ArXiv
Published version: Physical Review Letters, 98 (5), 052002.

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