1 / 25

First look at g -jet Samples using BDT e-ID Algorithm

First look at g -jet Samples using BDT e-ID Algorithm. Hai-Jun Yang University of Michigan (with X. Li and B. Zhou) ATLAS egamma Meeting March 9, 2009. Motivation. To estimate the dijet and g jet rejection rates using various e-ID algorithms (IsEM, Likelihood and BDT).

kesler
Download Presentation

First look at g -jet Samples using BDT e-ID Algorithm

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. First look at g-jet Samplesusing BDT e-ID Algorithm Hai-Jun Yang University of Michigan (with X. Li and B. Zhou) ATLAS egamma Meeting March 9, 2009

  2. Motivation • To estimate the dijet and g jet rejection rates using various e-ID algorithms (IsEM, Likelihood and BDT). • MC samples for test include • DS108087, g jet • DS105802, JF17 dijet • DS106050, Zee signal H. Yang - BDT e-ID

  3. MC g jet samples for test H. Yang - BDT e-ID

  4. Comparison of Input Variables H. Yang - BDT e-ID

  5. Comparison of Input Variables g-jets electrons dijets H. Yang - BDT e-ID

  6. Results of IsEM • Et(jet) > 17GeV, Tight cuts- Efficiency (Zee) = 70.9%- Rejection (gjet) = 426(±4.7%)- Rejection (jf17) = 3092(±5.9%) H. Yang - BDT e-ID

  7. e-ID (Likelihood)log(ElectronWt/BgWt)Et(jet) > 17GeV- Efficiency = 71%- Rej(gjet)=20(±1%)- Rej(jf17)=5200(±7.6%) H. Yang - BDT e-ID

  8. BDT trained for dijets e-ID (BDT_dijet)Et(jet) > 17GeV- Efficiency = 71%- Rej(gjet)=591(±5.5%)- Rej(jf17)=47830(±23%) H. Yang - BDT e-ID

  9. BDT peaks in g jet samples? H. Yang - BDT e-ID

  10. BDT trained for dijets • BDT H. Yang - BDT e-ID

  11. BDT trained for dijets • BDT H. Yang - BDT e-ID

  12. BDT trained for g jets e-ID (BDT_gjet)Et(jet) > 17GeV- Efficiency = 71%- Rej(gjet)=1788(±9.6%)- Rej(jf17)=19081(±15%) H. Yang - BDT e-ID

  13. BDT trained for g jets • BDT H. Yang - BDT e-ID

  14. BDT trained for g jets • BDT H. Yang - BDT e-ID

  15. BDT trained for dijets (top 10 vars) H. Yang - BDT e-ID

  16. BDT trained for g jets (top 10 vars) H. Yang - BDT e-ID

  17. Summary H. Yang - BDT e-ID

  18. Backup Slides H. Yang - BDT e-ID

  19. BDT peaks in g jet samples? H. Yang - BDT e-ID

  20. Comparison of Input Variables H. Yang - BDT e-ID

  21. Comparison of Input Variables H. Yang - BDT e-ID

  22. Comparison of Input Variables H. Yang - BDT e-ID

  23. Comparison of Input Variables H. Yang - BDT e-ID

  24. Comparison of Input Variables H. Yang - BDT e-ID

  25. Comparison of Input Variables H. Yang - BDT e-ID

More Related