The dE/dx capabilities of the D0 tracking system
- Northwestern Univ., Evanston, IL (United States)
The D0 forward tracking system has been extensively calibrated using electron and pion beams in the energy range from 10 GeV to 150 GeV in the neutrino area fixed target beam line at Fermilab. The forward tracking system provides a spatial resolution of 200 μm and a two hit separation of 2.5 mm at 90% efficiency. The chamber provides 32 samples of pulse height information for a given track equivalent to a dE/dx resolution of 12.7%. The energy loss response of the chamber to low energy-beam has been studied. A Monte Carlo simulation program has been developed based on the Photo Absorption Ionization model to simulate the dE/dx response of the chamber. The observations made using low energy test beam are consistent with the model`s predictions. The dE/dx measurement in the D0 tracking system provides identification of electrons against gamma conversions resulting from π0 decays. The rejection factor of distinguishing doubly minimum ionizing tracks in the chamber has been measured to be 30.5 with the requirement that singly minimum ionizing tracks be identified with a 90% efficiency. This factor improves with lower multiplicity. Using a Monte Carlo program based on GEANT, the identification efficiency of electrons and π0`s has been determined. Using the capabilities of the outer tracking system alone, the background due to isolated π0 production is reduced by up to a factor of 60 in the central direction based on measurements made on a sample of simulated QCD two jet events.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 10136098
- Report Number(s):
- DOE/CH/03000--T23; ON: DE94008849
- Country of Publication:
- United States
- Language:
- English
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