The D-Zero detector upgrade and physics program Page: 1 of 11
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S M*L Fermilab FERMILAB-Conf-0 1/012-E DO February 2001
UCR/DO/01-04
Fermilab-Conf-01/012-E
hep-ex/0101048
The DO Detector Upgrade and Physics Program
JOHN ELLISON
Department of Physics, University of California
Riverside, CA 92521-0413, USA
FOR THE DO COLLABORATION
Abstract
The DO detector at Fermilab is in the final stages of an extensive upgrade. It is designed to meet
the demands imposed by high luminosity Tevatron running planned to begin March 2001. The design
and performance of the detector subsystems are described and a brief outline of the physics potential
is presented.
1 Introduction
The future physics program at Fermilab will be greatly enhanced by the Tevatron upgrade which will
result in an increase in luminosity and allow datasets of 100 times those collected in Run I. This upgrade
will be accompanied by a decrease in the bunch crossing time from the Run I value of 3.5 ps to 396 ns
and finally to 132 ns as the number of bunches is increased in stages.
To take full advantage of the new physics opportunities and to contend with the much higher radiation
environment and shorter bunch crossing times, an extensive upgrade of the DO detector was undertaken,
and is now in its final stages.
The upgrade consists of the addition of a cosmic ray scintillator shield and bunch tagging system, the
replacement of the front end electronics for the calorimeter and the muon system, the upgrade of the muon
detection system, the replacement of the tracking system for both the central and forward regions, the
addition of preshower detectors, and improvements to the trigger and data acquisition systems. Figure 1
shows an elevation view of the upgraded detector.
2 Tracking
The tracking system (Fig. 2) consists of an inner silicon microstrip tracker (SMT), surrounded by a central
scintillating fiber tracker (CFT). These systems are contained within the bore of a 2T superconducting
solenoid, which is surrounded by a scintillator preshower detector.
The upgraded tracking system has been designed to meet several goals: momentum measurement by
the introduction of a solenoidal field; good electron identification and e/7r rejection; tracking over a large
range in pseudorapidity (77 ~ 3); secondary vertex measurement for identification of b-jets from Higgs
and top decays and for b-physics; first level tracking trigger; fast detector response to enable operation
with a bunch crossing time of 132 ns; and radiation hardness.
2.1 Silicon Microstrip Tracker
The silicon tracking system is based on 50 pm pitch silicon microstrip detectors providing a spatial
resolution of approximately 10 pm in r#. The high resolution is important to obtain good momentum
measurement and vertex reconstruction. The detector consists of a system of barrels and interleaved
disks designed to provide good coverage out to 7 z 3 for all tracks emerging from the interaction region,
which is distributed along the beam direction with az ~ 25 cm.
The barrel has 6 sections, each 12 cm long and containing 4 layers. The first and third layers of the
inner 4 barrels are constructed of double-sided 900-stereo detectors with axial strips and orthogonal z1
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Ellison, J. The D-Zero detector upgrade and physics program, article, February 8, 2001; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc725590/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.