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Geometric considerations in Z  μμ decay simulation and reconstruction

Geometric considerations in Z  μμ decay simulation and reconstruction. Pat Whitworth Tulane University. ATLAS. Muon Detectors Monitored drift tube chambers Thin gap chambers Resistive plate chambers Cathode strip chambers. Monitored Drift Tube chambers. 6 parallel layers

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Geometric considerations in Z  μμ decay simulation and reconstruction

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  1. Geometric considerations in Zμμ decay simulation and reconstruction Pat Whitworth Tulane University

  2. ATLAS • Muon Detectors • Monitored drift tube chambers • Thin gap chambers • Resistive plate chambers • Cathode strip chambers

  3. Monitored Drift Tube chambers • 6 parallel layers • Ionization electron drift time registration • 6 coordinates • Deformations monitored

  4. Alignment: importance • Incorrect measurements • Especially at higher momenta • Background more likely to be confused with event tracks • Single MDT chamber spatial resolution ~40μm • Chambers must be aligned to 30μm accuracy (to provide desired momentum resolution)

  5. Alignment: technique • RASNIK optical monitoring • Allows relative chamber displacements to be measured • Finds displacement of “mask” along the optical axis • A-lines • Corrections to nominal chamber position • B-lines • Chamber deformations and expansion

  6. Why Zμμ? • Observation of misalignment effects • Momentum resolution • Will not know “simulated” (real) momentum with real data • Effects on simulated Zμμ decay data can be studied for comparison to real decay data • The Reconstructed Z mass • Well-known shape • Width comparisons

  7. Previous alignment studies • Simulation and reconstruction using randomly generated, ~1mm displacements • Study performed by Matthias Schott

  8. GeoModel Running the full chain • Generation scripts (10K) • Simulation scripts (10K) • Perfect geometry used • Time-consuming • Digitization scripts (10K) • Reconstruction scripts • Perfect geometry (10K) • Real geometry (10K) • NTuple Production

  9. Results (Pending) Perfect Geometry Real Geometry Single muon momentum resolution Reconstructed Z mass

  10. Conclusions • Reconstructed Z mass width will most likely be useful in determining degree of alignment • Real alignment effects should be much larger than random 1mm displacements • Accurate alignment data (and its correct usage) is vital to data analysis

  11. Future study • Successful reconstruction using alignment data • Simulation using the misaligned geometry • Reconstruction with perfect and misaligned geometry • Simulate corrections from alignment sensors (some uncertainty) • Find how close one can get to a perfect measurement

  12. Acknowledgments • Steven Goldfarb • Edward Moyse • Matthias Schott • Christoph Amelung • University of Michigan • National Science Foundation • CERN

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