TB & Simulation results

1. TB & Simulation results Jose E. Garcia & M. Vos

2. 2 Atlas simulation and reconstruction tools have been used to simulate the TB tracking study with helix fit done last August. Introduction • Simulation results • Inner detector • SCT system • Simulation of Beam Test configuration • Setup • Results comparison • Projects and plans for the future SCT Week – March 03 TB & Simulation results Jose E. Garcia

3. 3 Software • Both DC1 and custom-generated Atlsim data have been used. • xKalman++ for the reconstruction. • Results are extracted from the combined ntuple (CBNT). • Muons of energies from 10 to 500 GeV. • More than 20K events for each energy, including runs with high statistics. SCT Week – March 03 TB & Simulation results Jose E. Garcia

4. Inner TDR Inner New 4 TDR results • Left column shows variation with  as in the TDR. • Right column results with reconstruction software and data from DC1. • In both cases particles simulated are muons with a PT of 20 GeV. • Round markers should be comparable (similar field and conditions). SCT Week – March 03 TB & Simulation results Jose E. Garcia

5. Inner TDR Inner New 5 TDR results (II) • All the plots show similar results with a slight deterioration in the forward part. • Some changes in software, layout and magnetic field could cause the difference. SCT Week – March 03 TB & Simulation results Jose E. Garcia

6. 6 Simulatedstand-alone SCT system SCT results Resolution of 1/pT Resolution in  SCT Week – March 03 TB & Simulation results Jose E. Garcia

7. 7 Simulatedstand-alone SCT system SCT results cont. Resolution of do Resolution of cot() SCT Week – March 03 TB & Simulation results Jose E. Garcia

8. 8 SCT Results cont. PT dependence SCT Week – March 03 • Actual simulation agrees with TDR. • It is possible to simulate the behavior of the stand alone SCT. • Track parameter resolution with increasing PT becomes flat. • Efficiency is around 92% and the fake rate for single muons reconstruction is negligible. TB & Simulation results Jose E. Garcia

9. 9 Setup SCT Week – March 03 TB & Simulation results Jose E. Garcia

10. 10 Setup SCT Week – March 03 TB & Simulation results Jose E. Garcia

11. 11 • To compare simulation and TB results 20K muons with PT = 500 GeV,   0 have been used. • This situation is similar to the TB due to the small curvature at this energies (xKalman++ is not able to disconnect the reconstruction from magnetic field). • Parameters of the helix fit from TB ATLAS. An example of distributions is shown below, TB results in red and simulation in white. Tracking system TB SCT Week – March 03 TB & Simulation results Jose E. Garcia

12. Pixels + SCT Test Beam SCT 12 Tracking comparison • Looking closer peaks due to the binary readout can be seen in testbeam and simulation. Adding the pixels to the simulation the “peaks disappear”. SCT Week – March 03 TB & Simulation results Jose E. Garcia

13. 13 Tracking comparison (II) • Resolutions for TB and simulation of the SCT are similar. • Slight deterioration for 1fC with respect to 1.2fC. • Precision Tracker resolution are given for comparison. SCT Week – March 03 TB & Simulation results Jose E. Garcia

14. 14 • Beam test tracking is compatible with full simulation + reconstruction. • The same study with magnetic field is needed. • Different energies (PT) should be used. The dependence of the wrong sign fraction could be checked with the 100 GeV beam. For track parameters lower energies are needed. Conclusions • Effect of multiple scattering can be analyzed adding more material (cooling pipe,…) in the TB setup. • The same tools could be used with new data. SCT Week – March 03 TB & Simulation results Jose E. Garcia