We present the results of a search for the production of new particles decaying into two jets in pbarp collisions at sqrt{s} = 1.8 TeV, using the DZero 1992-1995 data set corresponding to 109 pb^-1. ...We exclude at the 95% confidence level the production of excited quarks (q*) with masses below 775 GeV/c^2, the most restictive limit to date. We also exclude standard-model-like W' (Z') bosons with masses between 300 and 800 GeV/c^2 (400 and 640 GeV/c^2). A W' boson with mass $<$ 300 GeV/c^2 has been excluded by previous measurements, and our lower limit is therefore the most stringent to date.
Fast scintillation counters for the DO muon system upgrade Abramov, V.; Babintsev, V.; Baldin, B. ...
1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255),
1998, Letnik:
1
Conference Proceeding
The design and main parameters of the completely redesigned DO Forward Angle Muon System (FAMUS: 1.0<|/spl eta/|<2.0) for the next high luminosity Tevatron Collider run are reported. Results of the ...studies of trigger scintillation counters based on fast scintillator Bicron 404 A and WLS bars SOFZ-105 are presented. We report about results of test beam studies of prototype counters including minimum ionizing particle detection efficiency, time resolution and amplitude response. Radiation ageing of scintillating materials for doses up to 1 Mrad, phototube magnetic shielding in field of up to 700 G and ageing of phototubes are presented. All tests show the robustness of scintillation counters as triggering detectors for the new muon system for a long period.
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