276 research outputs found

    Simple acoustical technique for automated measurement of drift tube anode wire tension

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    We describe a simple and inexpensive acoustical technique that permits rapid, accurate and in-situ measurement of drift tube anode wire tensions even if the anode wire is electrically discontinuous.Comment: 5 text pages, 6 figures. fixed typo, minor content change in sec

    CP Violation Search in τππ0ντ\tau\to \pi\pi^0\nu_{\tau} Decays

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    Using a sample of 12.2 million τ\tau-lepton pairs produced by e+ee^+e^- annihilation at s10.6\sqrt{s}\sim 10.6 GeV and collected by the CLEO detector, we search for and set limits on CP violation in τ\tau-lepton decays. For each event, we require that both τ\tau-leptons decay via the mode \tau\ra \pi\pi^0\nu. The search is performed within the context of a multi-Higgs Doublet Model and the imaginary part of the coupling constant parameterizing the non-Standard Model diagram leading to CP violation is constrained to be 0.046<(Λ)<0.022-0.046 < \Im{(\Lambda}) < 0.022 at 90% CL. The novel search technique is of general utility.Comment: 4 pages, 7 figures, 1 table. Conference proceeding for BCP4, 19-23 February 2001, Ise-Shima, Japa

    A Compact Apparatus for Muon Lifetime Measurement and Time Dilation Demonstration in the Undergraduate Laboratory

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    We describe a compact apparatus that automatically measures the charge averaged lifetime of atmospheric muons in plastic scintillator using low-cost, low-power electronics and that measures the stopping rate of atmospheric muons as a function of altitude to demonstrate relativistic time dilation. The apparatus is designed for the advanced undergraduate physics laboratory and is suitable for field measurements.Comment: 5 pages, 2 figure

    Constraints on Light Bottom Squarks from Radiative B-Meson Decays

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    The presence of a light b-squark (with mass about 4 GeV) and gluino (with mass about 15 GeV) might explain the observed excess in b-quark production at the Tevatron. Though provocative, this model is not excluded by present data. The light supersymmetric particles can induce large flavor-changing effects in radiative decays of B mesons. We analyse the decays B->X_s gamma and B->X_{sg} in this scenario and derive restrictive bounds on the flavor-changing quark-squark-gluino couplings.Comment: 14 pages, 3 figures. One reference added. Final version published in Physics Letters

    One-particle inclusive CP asymmetries

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    One-particle inclusive CP asymmetries in the decays of the type B -> D(*) X are considered in the framework of a QCD based method to calculate the rates for one-particle inclusive decays.Comment: Latex, 13 pages, 6 figures (eps). Analytical and numerical results unchanged, extended discussion of model assumptions and systematic uncertainties. Version to be published in Phys. Rev. D 62, 0960xx. Additional transparencies are available via the WWW at http://www-ttp.physik.uni-karlsruhe.de/Slides