Measurement of the hadronic background in the identification of muons
A 2 /times/ 2 m/sup 2/-sized prototype of the muon detector for the UA1 experiment at the pp storage ring of the European Nuclear Research Center CERN was tested in a negative pion beam with 10 GeV/c momentum. The muon detector consists of drift tubes with an optimized, simple electric field configuration. The spatial resolution of the drift tubes lies between 0.2 and 0.3 mm for perpendicular particle incidence, and decreases up to 1 mm for an incidence angle of 60/degree/. Non-linearities in the location-time relation are explainable from the shape of the electric field. The hadronic punch-through was studied in connection with the calorimeters of the UA1 experiment. This punch-through forms a strong source of background in muon identification. In the momentum range from 2 GeV/c to 10 GeV/c and an equivalent calorimeter thickness of 102 cm of iron the probability for hadronic punch-through W/sub h/ is described. W/sub h/ is taken with respect to an incident pion. By inserting additional calorimeters, each equivalent to 24.3 cm of iron, the punch-through is reduced by a factor of 1/3. Only at high particle momenta above 5 GeV/c does the information from the calorimeters make punch-through suppression possible. At lower momenta in the range of 2 to 3 GeV/c an angle cut for the tracks in the muon detector as reconstructed in two projections is very effective. This suppresses the punch-through by a factor of 20 to 50, without losing more than 5% of the muons with a momentum greater than 10 GeV/c. 36 refs., 46 figs., 5 tabs.
- Research Organization:
- Technische Hochschule Aachen (Germany, F.R.)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7778373
- Report Number(s):
- ORNL/tr-88/31; ON: DE89001417
- Resource Relation:
- Other Information: Thesis. Portions of this document are illegible in microfiche products; Related Information: Translation of German Diploma Thesis, October 1982
- Country of Publication:
- Germany
- Language:
- English
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MUONS
PARTICLE IDENTIFICATION
DATA ACQUISITION SYSTEMS
ENERGY SPECTRA
INTERMEDIATE VECTOR BOSONS
MULTIPLICITY
MUON DETECTION
PARTICLE DECAY
PEP STORAGE RINGS
PROTON-ANTIPROTON INTERACTIONS
SHOWER COUNTERS
TRANSVERSE MOMENTUM
WEINBERG ANGLE
BARYON-BARYON INTERACTIONS
BOSONS
CHARGED PARTICLE DETECTION
DECAY
DETECTION
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
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INTERMEDIATE BOSONS
LEPTONS
LINEAR MOMENTUM
MEASURING INSTRUMENTS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE INTERACTIONS
RADIATION DETECTION
RADIATION DETECTORS
SPECTRA
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645100* - High Energy Physics- Particle Interactions & Properties-Experimental
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