1,384 research outputs found

    Search for R-Parity violating Supersymmetry with the D0 Detector

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    Searches for R-parity violating supersymmetry with the D0 detector at the Fermilab Tevatron ppbar-collider are presented. In the case of non-zero LLE couplings lambda_ijk>=0.01, multi-lepton final states, and for a small coupling lambda_122<<0.01 di-muon final states are studied. The case of non-zero LQD coupling lambda'_211 leads to final states with two muons and jets. A total integrated luminosity of 0.38 fb-1 collected between April 2002 and August 2004 is utilized. The observed numbers of events are in agreement with the Standard Model expectation, and limits on RPV supersymmetry are derived, extending significantly previous bounds.Comment: to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 200

    Performance of the CMS Cathode Strip Chambers with Cosmic Rays

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    The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns

    Performance and Operation of the CMS Electromagnetic Calorimeter