22 research outputs found

    Track D Social Science, Human Rights and Political Science

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    Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138414/1/jia218442.pd

    Performance of the ALEPH detector at LEP

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    The performance of the ALEPH detector at the LEP e+e− collider is reviewed. The accuracy of the tracking detectors to measure the impact parameter and momentum of charged tracks is specified. Calorimeters are used to measure photons and neutral hadrons, and the accuracy obtained in energy and angle is given. An essential property of the detector is its ability to identify particles; the performance in identification of electrons, muons, neutrinos (from missing energy), charged hadrons, π0's and V0's is described

    Measurement of the B‟0\overline{B}^0 and B−B^- meson lifetimes

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    Measurement of the b→τ−ΜˉτXb \rightarrow \tau^-\bar{\nu}_{\tau}X branching ratio and an upper limit on B−→τ−ΜˉτB^- \rightarrow \tau^-\bar{\nu}_{\tau}

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    A precise measurement of ΓZ→bbˉ\Gamma_{Z\rightarrow b \bar{b}} / ΓZ→hadrons\Gamma_{Z\rightarrow hadrons}

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    First measurement of the B(S) meson mass

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    In a sample of about 1.1 million hadronic Z decays recorded with the ALEPH detector during the 1990–1992 running of LEP, two unambiguous BS meson candidates were observed. From these events the mass of the BS meson has been measured to be 5.3686 ± 0.0056 (stat.) ± 0.0015 (syst.) GeV
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