Measurement of the branching fraction for $Υ(1S) \to τ^+ τ^-$

Details Measurement of the branching fraction for $Υ(1S) \to τ^+ τ^-$ Measurement of the branching fraction for $Υ(1S) \to τ^+ τ^-$

1994-09-23

arxiv.org/abs/hep-ex/9409004v1

Phys.Lett.B340:129-134,1994

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, RevTeX, two Postscript figures available upon request, CLNS 94/1297, CLEO 94-20 (submitted to Physics Letters B)

Scientific paper

10.1016/0370-2693(94)91309-9

We have studied the leptonic decay of the $\Upsilon (1S)$ resonance into tau pairs using the CLEO II detector. A clean sample of tau pair events is identified via events containing two charged particles where exactly one of the particles is an identified electron. We find $B(\Upsilon(1S) \to \tau^+ \tau^-) = (2.61~\pm~0.12~{+0.09\atop{-0.13}})%$. The result is consistent with expectations from lepton universality.

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