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 particles detection efficiency, time resolution and amplitude response.
Forward muon system for the DØ detector upgrade Abramov, V.; Alexeev, G.; Babintsev, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1998, Letnik:
419, Številka:
2-3
Journal Article
Recenzirano
Odprti dostop
The design and main parameters of the completly redesigned DØ Forward Angle MUon System (FAMUS: 1.0<|η|<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 404A and WLS bars SOFZ-105 are presented. We report about results of test beam studies of prototype counters including minimum ionizing particles detection efficiency, time resolution and amplitude response. Radiation ageing of scintillating materials for the doses up to 1Mrad, phototubes magnetic shielding in the fields of up to 700G and ageing of phototubes are presented. Mini-Drift Tubes (MDTs) are chosen as FAMUS tracking detectors. The detector is a drift wire chamber with a metallic cathode. The detector operates in proportional mode with a fast freon–methane gas mixture to provide high drift velocity, adequate counting rate and low ageing. A description of the performance of the MDT is given. Studies of two prototypes in test beams were performed at FNAL and JINR. Obtained coordinate accuracy is around 0.5mm r.m.s. All tests show robustness of MDT as tracking detector of the new muon system for a long period in high DØ background radiation conditions.
First experimental results are presented from a search for events with a rapidity gap between jets. The D0 detector was used to examine events produced by the Fermilab Tevatron ital pbar p collider ...at radicalital s =1.8 TeV. The fraction of events with an observed rapidity gap between the two highest transverse energy (ital Esub ital T) jets is measured as a function of the pseudorapidity separation between the jet edges (Deltaetasub ital c). An upper limit at the 95% confidence level of 1.1times10sup minus2 is obtained on the fraction of events with non particles between the jets, for events with Deltaetasub ital cgt3 and jet ital Esub ital T greater than 30 GeV.
We have searched for evidence of top quark production in ital pbar p collisions at radicalital s =1.8 TeV using the ital D0 detector at the Fermilab Tevatron collider. For an integrated luminosity of ...15 pbsup minus1, we report results of a search for ital tbar t pairs in the decay modes ital tbar tr arrowital emu+jets,ital ee+jets,ital e+jets, and mu+jets. From analyses of these modes we obtain a lower limit on the top quark mass of 131 GeV/ital csup 2 at the 95% confidence level, assuming standard model branching fractions and a predicted cross section for ital tbar t production. We discuss the properties of an event for which expected backgrounds are small.
We report on a search for first generation leptoquarks with the DO detector at the Fermilab Tevatron ital pbar p collider at radicalital s =1.8 TeV. This search is based on 15 pbsup minus1 of data. ...Leptoquarks are assumed to be produced in pairs and to decay into an electron + quark with branching ratio beta. No leptoquark candidates were found. We obtain cross section times branching ratio limits as a function of leptoquark mass. For pair production of scalar leptoquarks, we set a leptoquark mass limit of 133 GeV for beta=1 and 120 GeV for beta=0.5 at 95% confidence level.
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