4,004 research outputs found

    Searches for New Physics at D0

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    The integrated luminosity at Run 2 of the Tevatron is approaching the Run 1 total, and data analysis is progressing. New results in searches for new physics by the DO experiment are presented in a variety of channels, demonstrating good performance of the detector and detailed understanding of the data.Comment: 6 pages, proceedings of the 38th Rencontres de Morion

    Top Quark Mass Measurements at the Tevatron

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    The general strategy, as well as channel-specific details, applied to the measurement of the top quark mass at the Tevatron in Run I are reviewed, and the combination of the results obtained by the CDF and DO collaborations presented. The accelerator and detector upgrades for Run II are described, and expected improvements in the systematic uncertainties on the measurement evaluated.Comment: Latex (Frascati.sty), 11 pages, 3 figs. Talk given at the 14th Rencontres de Physique de la Vallee d'Aoste, La Thuile, Aosta Valley, Italy, February 200

    Mixing and CP Violation at the Tevatron

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    Measurements of meson mixing and CP violation parameters obtained by the CDF and D0 experiments at the Fermilab Tevatron are presented. These include results on BsB_s and DD meson mixing, and searches for CP violation in the decay B+→J/ψK+B^+ \to J/\psi K^+, in mixing through semileptonic BsB_s meson decays, and in the interference between mixing and decay in the process Bs→J/ψϕB_s \to J/\psi \phi.Comment: 9 pages, Proceedings of the Hadron Collider Physics Symposium (HCP2008),Galena, Illinois, US

    Determination of Scanning Efficiencies in Experiments Using Nuclear Emulsion Sheets

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    During their exposure, nuclear emulsion sheets detect both tracks from experiment-related particles, as well as a considerable amount of background tracks, mainly due to cosmic rays. Unless the exposure has been fairly short, it is therefore fairly likely that a fraction of the tracks that have been identified as belonging to the particles the experiment is interested in, are really due to background. A method, which allows to measure this fraction reliably directly from the data, is described.Comment: 7 pages, uses elsart, to be published in NIMA 450, p 44

    High pT Hadronic Top Quark Identification

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    At the LHC objects with masses at the electroweak scale will for the first time be produced with very large transverse momenta. In many cases, these objects decay hadronically, producing a set of collimated jets. This interesting new experimental phenomenology requires the development and tuning of new tools, since the usual reconstruction methods would simply reconstruct a single jet. This note describes the application of the YSplitter algorithm in conjunction with the jet mass to identify high transverse momentum top quarks decaying hadronically

    A Supersymmetric Solution to the Solar and Atmospheric Neutrino Anomalies

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    The formalism for neutrino flavor change induced by lepton family number violating interactions is developed for the three-neutrino case, and used to derive the corresponding flavor change probabilities in matter. Applied to the solar and atmospheric neutrino fluxes, it is argued that the observed anomalies, including the zenith dependence for the atmospheric case, could be due to such interactions.Comment: 6 pages, 1 figure Modifications: include limit from tau -> rho mu (leads to somewhat different conclusions) and a change to the figur

    Searches for New Physics in ATLAS

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    Draft slides for Aspen 201

    Signals of Parity Restoration at ATLAS and CMS

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    An overview of the ATLAS and CMS discovery potential for signals of parity restoration at high energy is given

    Top Reconstruction Algorithms in ATLAS

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    A brief overview of top reconstruction algorithms in ATLAS is given