Measurement of the branching fraction for Upsilon (1S) ---> tau+ tau-

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) \rightarrow \tau~+ \tau~-) = \left(2.61\pm0.12{+0.09\atop{-0.13}}\right)\%

. The result is consistent with expectations from lepton universality.

colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Upsilon(9460): electroproduction
electroproduction: Upsilon(9460)
Upsilon(9460): leptonic decay
leptonic decay: Upsilon(9460)
tau: pair production
pair production: tau
final state: (electron)

References(11)

Figures(0)

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