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 Physics Analysis in the ATLAS Muon Spectrometer Victoria A Moeller U of M Physics Analysis in the ATLAS Muon Spectrometer Victoria A Moeller U of M CERN NSF REU Summer 2006

ATLAS Computing System Commissioning (CSC) Test – Beginning in Fall 2006, Testing: • • ATLAS Computing System Commissioning (CSC) Test – Beginning in Fall 2006, Testing: • • Tier-0 Scaling Distributed Data Management & Processing Analysis Tools & Distributed Analysis Full Software Chain Streaming Test Calibration & Alignment Trigger Chain

Preparing for the CSC Test • Developing Analysis Procedures – Testing, Updating, Validating • Preparing for the CSC Test • Developing Analysis Procedures – Testing, Updating, Validating • Performing Preliminary Comparison of Perfect and Mis-Aligned Geometries – Using Data Simulated with Perfect Geometry and Reconstructed with Realistic Geometry

Analysis Procedures – Obtaining and Installing a Grid Certificate – Registering with the ATLAS Analysis Procedures – Obtaining and Installing a Grid Certificate – Registering with the ATLAS Virtual Organization – Locating Simulated Data Sets on castor and on the Grid, using DQ 2 – Transferring Data Sets between the Grid, castor, and lxplus – Installing and Running Athena for Reconstruction and Analysis – Running Jobs interactively, in batch, and on the Grid – Analyzing Athena-Aware n-tuples • Reconstructing with Mis-Aligned Geometry

Calibration & Alignment Test and the Muon Spectrometer Dx = -1. 75 mm Dy Calibration & Alignment Test and the Muon Spectrometer Dx = -1. 75 mm Dy = 5. 25 mm • Perfect Geometry replaced with ‘Realistic’ Detector Conditions Dq. BOL~ 1 mrad Dq. BML~ 1. 3 mrad Dq. BIL~ 1. 8 mrad Dx = 3. 5 mm Dy = 3. 5 mm Dq = 0. – Real Muon Spectrometer Eventually Aligned to a Precision of 50 microns over 25 meters – Alignment Will Not be Perfectly Understood for Initial Data Dx = -3. 5 mm Dy = 3. 5 mm Dq = 0. Dx = 0. Dy = 0. y z Dx = 0. mm Dy = 7. mm Dq = 0. x

Z’ in ATLAS • pp Z’ + – Predicted by Grand Unified Theories – Z’ in ATLAS • pp Z’ + – Predicted by Grand Unified Theories – Possible Light Higgs Channel • Can be detected with statistical significance in LHC up to 2 Te. V Z’ mass • Z + - – Well Known Mass – Low Background – Used for Calibration • Z’/Z cross section ratio will distinguish between theoretical models

Preliminary Effect of Mis-Aligned Geometry on Z’ Measurement • Starting with 376 Reconstructed Events Preliminary Effect of Mis-Aligned Geometry on Z’ Measurement • Starting with 376 Reconstructed Events with Two Muons • Selected Events with – Opposite Charge – Fit Quality – Minimum Transverse Energy • For Perfect Geometry 328 Events • For Mis-Aligned Geometry 31 Events • Initial Analysis – Substantial Loss in Efficiency with Small Random Displacements • Lots of Investigation Still To Be Done!

Continuing Z and Z’ Analysis • Investigate Efficiency Loss • Obtain Data from the Continuing Z and Z’ Analysis • Investigate Efficiency Loss • Obtain Data from the Grid • Run Jobs on the Grid • Test Efficiency in Z • ATLAS CSC Test – Reverse the Analysis • Simulate with Mis-Aligned Geometry and Reconstructing with Perfect Geometry

Acknowledgements Dr. Steven Goldfarb CERN National Science Foundation Ford University of Michigan Acknowledgements Dr. Steven Goldfarb CERN National Science Foundation Ford University of Michigan

Questions? Questions?