A Study of Electromagnetic and Hadronic Shower Shapes and Position Resolution, and the Jet Energy Response of the D0 Calorimeter
- Univ. of Rochester, NY (United States)
The D-Zero experiment at Fermi National Accelerator Laboratory examines proton-antiproton collisions at a center of mass energy of 1.8 Te V. An analysis of the response of the D-Zero calorimeter to single electrons and pions has been performed. The data were obtained from beam tests performed on end calorimeter modules between May and August of 1990. The shapes of electromagnetic and hadronic energy showers were as expected, and agreed with Monte Carlo simulations of the detector. Many methods were investigated to determine the transverse position of the centroid of a particle shower. A corrected-center-of-gravity method gave good results for electromagnetic showers. For hadronic showers, the best algorithm for determining shower centroid position was a center-of-gravity type of calculation with specific weights using all the longitudinal layers of the calorimeter. In both the electromagnetic and hadronic case, the magnitudes of optimized readout tower thresholds indicated that the tails of the transverse energy distributions could be ignored in calculations of position. The energy dependence of the electromagnetic position resolution was found to be σ(r · Φ) = (17.9 ± 0.4)E-0.6851±0.005 mm and of the hadronic position resolution was σ(r · Φ) = (54.9 ± 1.3)E-0.551±0.005 mm. The energy dependence of the hadronic position resolution in the current D-Zero Monte Carlo does not follow the idealized E- 1/2 behavior. The angular dependence of the position resolution was as expected. The energy response for jets in the D-Zero calorimeter can be estimated from the energy response of the calorimeter to single particles, convoluted with the particle content of jets. The transverse energy of jets calculated by summing simulated single particles reproduced the energy dependence for jets produced in the calorimeter using the event generator ISAJET. To use test-beam data as input for calculating the jet energy expected in the collider environment, the Monte Carlo will have to be tuned to match the test beam data, a reliable simulation of jet fragmentation must be found, and effects due to energy leakage in and out of the jet cone must be measured in each event.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1372851
- Report Number(s):
- FERMILAB-THESIS-1993-12; UMI-93-22074; UR-1309; ER-40685-758; 353759
- Country of Publication:
- United States
- Language:
- English
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