23 research outputs found

    Electroweak measurements in electron–positron collisions at w-boson-pair energies at lep

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    Contains fulltext : 121524.pdf (preprint version ) (Open Access

    Algies vasculaires de la face associées à une acromégalie et soulagées par la somatostatine

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    An upper limit for the τ\tau neutrino mass from τ5π(π0)ντ\tau \rightarrow 5 \pi (\pi^0) \nu_{\tau} decays

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    An upper limit for the tau-neutrino mass has been determined from the decay tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to 1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL is obtained using a two-dimensional method in the 5pi invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using tau+tau- -> 3h+- \bar{nu}_tau 3h-+ \nu_tau decays, a new combined limit of m_{nu_tau} < 27.6 MeV (95% CL) is obtained

    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    An upper limit for the τ\tau neutrino mass from τ5π(π0)ντ\tau \rightarrow 5 \pi (\pi^0) \nu_{\tau} decays

    No full text
    An upper limit for the tau-neutrino mass has been determined from the decay tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to 1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL is obtained using a two-dimensional method in the 5pi invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using tau+tau- -> 3h+- \bar{nu}_tau 3h-+ \nu_tau decays, a new combined limit of m_{nu_tau} < 27.6 MeV (95% CL) is obtained

    Inclusive π±,K±\pi^{\pm}, K^{\pm} and (p,pˉ)(p,\bar{p}) differential cross-sections at the Z resonance

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Measurement of the bτνˉτXb \rightarrow \tau^-\bar{\nu}_{\tau}X branching ratio and an upper limit on BτνˉτB^- \rightarrow \tau^-\bar{\nu}_{\tau}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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