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Scientific article
Open access
English

Upsilon production in Z decays

ContributorsL3 Collaboration
Published inPhysics Letters. B, vol. 413, p. 167-175
Publication date1997
Abstract

We have searched for evidence of Τ production in 3.5 million hadronic Z decays collected by the L3 detector at LEP in 1991–1995. No signals are observed for the decay chain Z → ΤX; Τ → ℓ⁺ℓ⁻ (ℓ=e,μ), therefore upper limits at 95% confidence level are set on the following Z branching fractions: Br(Z → Τ(1S)X) < 5.5 x 10⁻⁵; Br(Z → Τ(2S)X) < 13.9 x 10⁻⁵; Br(Z → Τ(3S)X) < 9.4 × 10⁻⁵.

Citation (ISO format)
L3 Collaboration. Upsilon production in Z decays. In: Physics Letters. B, 1997, vol. 413, p. 167–175. doi: 10.1016/S0370-2693(97)01002-2
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ISSN of the journal0370-2693
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