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Title

Upsilon production in Z decays

CollaborationWith : Ambrosi, Giovanni / Bourquin, Maurice / Braccini, Saverio / Burger, William / Paus-Cecchi, Claudia / Extermann, Pierre / Field, John / Fredj, Lotfi / Kienzle, Maria-Novella / Muheim, Franz / Produit, Nicolas / Sciarrino, Deborah / Susinno, Gabriele
Published in Physics letters. B. 1997, vol. 413, p. 167-175
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.
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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 https://archive-ouverte.unige.ch/unige:113056

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Deposited on : 2019-01-18

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