Scintillation counters for the DØ muon upgrade Acharya, B.S.; Baldin, B.; Banerjee, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1997, Letnik:
401, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We present the results of an upgrade to the DØ muon system. Scintillating counters have been added to the existing central DØ muon system to provide rejection for cosmic-ray muons and out-of-time ...background, and to provide additional fast-timing information for muons in an upgraded Tevatron. Performance and results from the 1994–1996 Tevatron run are presented.
Determination of the absolute jet energy scale in the DØ calorimeters Abbott, B; Adam, I; Adams, M ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1999, Letnik:
424, Številka:
2
Journal Article
Recenzirano
Odprti dostop
The DØ detector is used to study
p
p
̄
collisions at the 1800 and 630
GeV center-of-mass energies available at the Fermilab Tevatron. To measure jets, the detector uses a sampling calorimeter ...composed of uranium and liquid argon as the passive and active media, respectively. Understanding the jet energy calibration is not only crucial for precision tests of QCD, but also for the measurement of particle masses and the determination of physics backgrounds associated with new phenomena. This paper describes the energy calibration of jets observed with the DØ detector at the two
p
p
̄
center-of-mass energies in the transverse energy and pseudorapidity range
E
T>8
GeV and |
η|<3.
We report on a search for R-parity violating supersymmetry in p-pbar collisions at sqrt(s) = 1.8 TeV using the D0 detector at Fermilab. Events with at least two electrons and four or more jets were ...studied. We observe 2 events in 99 +- 4.4 pb-1 of data, consistent with the expected background of 1.8 +- 0.4 events. This result is interpreted within the framework of minimal low-energy supergravity supersymmetry models. Squarks with mass below 243 GeV/c^2 and gluinos with mass below 227 GeV/c^2 are excluded at the 95% confidence level (C. L.) for A_0=0, mu < 0$, tan beta=2 and a finite value for R-parity violating Yukawa coupling lambda'_1jk (j=1, 2 and k=1, 2, 3). For equal squark and gluino masses, the corresponding mass limit is 277 GeV/c^2.
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