1 / 12

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

sasson
Télécharger la présentation

Geometric considerations in Z  μμ decay simulation and reconstruction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related