8 research outputs found

    Study of muon-pair production at centre-of-mass energies from 20 to 136 GeV with the Aleph detector

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    The total cross section and the forward-backward asymmetry for the process e+eμ+μ(nγ)e^+ e^- \rightarrow \mu^+ \mu^- (n \gamma) are measured in the energy range 20-136 GeV by reconstructing the effective centre-of-mass energy after initial state radiation. The analysis is based on the data recorded with the ALEPH detector at LEP between 1990 and 1995, corresponding to a total integrated luminosity of 143.5 pb1\mathrm{pb}^{-1}. Two different approaches are used: in the first one an exclusive selection of events with hard initial state radiation in the energy range 20-88 GeV is directly compared with the Standard Model predictions showing good agreement. In the second one, all events are used to obtain a precise measurement of the energy dependence of σ0\sigma^0 and AFB0A_{\mathrm{FB}}^0 from a model independent fit, enabling constraints to be placed on models with extra Z bosons

    Resonant structure and flavour tagging in the Bπ±B\pi^{\pm} system using fully reconstructed BB decay

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    Resonant structure and flavour tagging in the Bπ±B\pi^{\pm} system using fully reconstructed BB decay

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    A measurement of the inclusive bsγb \to s \gamma branching ratio

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    The topology dependence of charged particle multiplicities in three-jet events

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    The topology dependence of charged particle multiplicities in three-jet events

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    A measurement of the gluon splitting rate into bbˉb\bar b pairs in hadronic Z decays

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    A measurement of the gluon splitting rate into bbˉb\bar b pairs in hadronic Z decays

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