[en] The D0 Detector at the Fermi National Accelerator Laboratory is a large multipurpose detector facility designed for the study of proton-antiproton collision products at the center-of-mass energy of 2 TeV. It consists of an inner tracking volume, hermetic uranium/liquid argon sampling calorimetry, and an outer 47π muon detector. In preparation for our first collider run, the collaboration organized a Cosmic Ray Commissioning Run, which took place from February--May of 1991. This thesis is a detailed study of the response of the central calorimeter to cosmic ray muons as extracted from data collected during this run. We have compared the shapes of the experimentally-obtained pulse height spectra to the Landau prediction for the ionization loss in a continuous thin absorber in the four electromagnetic and four hadronic layers of the calorimeter, and find good agreement after experimental effects are folded in. We have also determined an absolute energy calibration using two independent methods: one which measures the response of the electronics to a known amount of charge injected at the preamplifiers, and one which uses a carry-over of the calibration from a beam test of central calorimeter modules. Both absolute energy conversion factors agree with one another, within their errors. The calibration determined from the test beam carryover, relevant for use with collider physics data, has an error of 2.3%. We believe that, with further study, a final error of ∼1% will be achieved. The theory-to-experiment comparison of the peaks (or most probable values) of the muon spectra was used to determine the layer-to-layer consistency of the muon signal. We find that the mean response in the 3 fine hadronic layers is (12 ± 2%) higher than that in the 4 electromagnetic layers. These same comparisons have been used to verify the absolute energy conversion factors. The conversion factors work well for the electromagnetic sections

[en] The D0 detector, located at the Fermi National Accelerator Laboratory in Batavia, Illinois, USA, is a large hermetic detector designed for the study of proton-antiproton collisions at a center-of-mass energy of 2 TeV. The calorimeter is a sampling device that employs uranium absorber and liquid argon as the active material. It has been designed for the high-precision energy measurement of electrons and jets over the full solid angle, and excellent missing transverse energy resolution for enhanced neutrino open-quotes detectionclose quotes. The authors report on some fundamental aspects of the D0 calorimeter's design and performance (the latter having been measured in both test beams and during recent data taking at the Fermilab collider), and their plan for the upgrade, which has been designed to accomodate the higher luminosities anticipated after completion of the Fermilab Main Injector

[en] The D null detector, located at the Fermi National Accelerator Laboratory in Batavia, Illinois, USA, is a large hermetic detector designed to study the products of p anti p collisions at a center of mass energy of √s = 1.8 TeV. The centerpiece of the detector is uranium/liquid argon sampling calorimetry, which provides high resolution detection of the physics signatures of interest - electrons, photons, jets and missing transverse energy - over a full solid angle. We discuss below how the calorimeter information is used to detect the final states relevant to the physics we are pursuing, and describe a number of physics processes and results that demonstrate the utility of some of our design choices

[en] The D null detector, a large collider detector located at the Fermi National Accelerator Laboratory, has begun implementing a major detector upgrade in anticipation of the completion of the Main Injector project at the Fermilab Tevatron. The calorimeter readout has been redesigned in order to accommodate the factor of ∼ 10 increase in instantaneous luminosity and the decrease in the inter- bunch separation. Our means of dealing with the increased event rate, along with our plan for controlling overall noise levels in the calorimeter, are discussed. We also present a brief overview of the design for the detector upgrade, including a discussion of some on the more cogent physics topics that will be accessible with the factor of ∼ 20 increase over the present data sample

[en] Preliminary measurements of the inclusive jet and single photon production cross sections in p bar p collisions at √ bar s = 1.8 TeV by the D0 experiment at the Fermilab Tevatron are reported. The inclusive jet cross sections in various pseudorapidity ranges covering |η| < 3 are presented, along with comparisons to next-to-leading order QCD predictions. The single photon cross section in the central region (|η| < 0.9) is also presented, as is a description of the conversion method used to determine the background contamination. The single photon cross section is compared to a recent next-to-leading logarithm QCD calculation

[en] The D0 detector has over 100000 input channels and over 7000 printed circuit boards distributed across seven major systems. This paper describes some of the hardware and software tools that are being developed to aid in installing and commissioning the detector electronics up to the level-2 trigger system. (orig.)

[en] We describe test results on the operation of a time projection chamber incorporated into a Cherenkov counter to track a particle while it is emitting its Cherenkov light. The common Cherenkov and drift chamber medium is high-pressure hydrogen. The ring-imaging counter detects and digitizes Cherenkov photons by means of an image-intensifier and matrix-camera. The TPC measures the particle trajectory without obscuring the Cherenkov light. In a beam of 5.4 GeV/c pions, the particle direction is determined to within 82 μrad and the particle velocity to within 9 ppm. (orig.)

[en] The DOe preshower detector consists of scintillator strips with embedded wavelength-shifting fibers, and a readout using Visible Light Photon Counters. The response to minimum ionizing particles has been tested with cosmic-ray muons. We report results on the gain calibration and light-yield distributions. The spatial resolution is investigated taking into account the light sharing between strips, the effects of multiple scattering and various systematic uncertainties. The detection efficiency and noise contamination are also investigated

[en] We describe details of the D0 calorimeter modules and the data acquisition system. We present results about the resolution of ''electromagnetic'' and ''hadronic'' modules, as obtained from exposure to 10-150 GeV electrons and pions in a test beam at Fermilab. Results on the position resolution for electromagnetic showers are also given. (orig.)

[en] We have measured the dijet angular distribution in √(s)=1.8 TeV p bar p collisions using the D0 detector. Order α³_s QCD predictions are in good agreement with the data. At 95% confidence limit the data exclude models of quark compositeness in which the contact interaction scale is below 2TeV. copyright 1998 The American Physical Society