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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).

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

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  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

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