Track Finding of Cosmic Multi-muon Events in the L3+C Muon Detector

LI Li; ZHANG Feng; WANG Rui-Guang; CHEN He-Sheng; MA Yu-Qian

Chinese Physics C> 2004, Vol. 28> Issue(7) : 749-752

Track Finding of Cosmic Multi-muon Events in the L3+C Muon Detector

Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
We describe a track finding method based on the Combinatorial Hough Transform (CHT) in the large drift chambers of the L3+C experiment at CERN. With the feature of near parallelism of muons in cosmic multi-muon events, the dominant direction can be estimated from the histogram of directions of segments. Then the CHT in finding the whole track can be greatly optimized. The cross octant reconstruction program can efficiently reconstruct cosmic muon events with multiplicity up to 50.

References

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. Adriani O et al. Nucl. Instr. and Methods, 2002, A488: 2092. Adeva B et al. Nucl. Instr. and Methods, 1989, A 277: 1873. Fr..hwirth R et al. Data Analysis Techniques for High..Energy Phy..sics. 2nd edit ion. Cambridge: Cambridge Univ. Press, 20004. Hough V C P. Machine Analysis of Bubble Chamber Pictures. In: International Conference on High Energy Accelerators and Instrumentat ion.CERN, 1958. 5545. Johnson S et al. In Computing in High Energy and Nuclear Physics( CHEP98) , 19986. Billoir P. Computer Physics Communications, 1989, 57: 3907. Ben-Tzvi D, Sandler M B. Pattern Recognit ion Lett. , 1990, 11: 1678. Karimki V. Effective Circle Fitting for Part icle Trajectories. TechnicalReport, SEFT, Univ. of Helkinki, 19909. Swain J, Taylor L. L3 Comput ing Guide, NUB-3065, CERN, 1993

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LI Li, ZHANG Feng, WANG Rui-Guang, CHEN He-Sheng and MA Yu-Qian. Track Finding of Cosmic Multi-muon Events in the L3+C Muon Detector[J]. Chinese Physics C, 2004, 28(7): 749-752.

LI Li, ZHANG Feng, WANG Rui-Guang, CHEN He-Sheng and MA Yu-Qian. Track Finding of Cosmic Multi-muon Events in the L3+C Muon Detector[J]. Chinese Physics C, 2004, 28(7): 749-752. shu

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Received: 2003-12-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Track Finding of Cosmic Multi-muon Events in the L3+C Muon Detector

Corresponding author: LI Li,

Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2003-12-16
Accepted Date: 1900-01-01
Available Online: 2004-07-05

Abstract: We describe a track finding method based on the Combinatorial Hough Transform (CHT) in the large drift chambers of the L3+C experiment at CERN. With the feature of near parallelism of muons in cosmic multi-muon events, the dominant direction can be estimated from the histogram of directions of segments. Then the CHT in finding the whole track can be greatly optimized. The cross octant reconstruction program can efficiently reconstruct cosmic muon events with multiplicity up to 50.