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Progress on SUSY particles reconstruction methods

Progress on SUSY particles reconstruction methods. Massimiliano Chiorboli Università di Catania. mSUGRA Points. Proposed Post-LEP Benchmarks for Supersymmetry (hep-ph/0106204). High total SUSY cross section we can try to reconstruct masses with low integrated luminosity. Point B. (26 %).

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Progress on SUSY particles reconstruction methods

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  1. Progress on SUSY particles reconstruction methods Massimiliano Chiorboli Università di Catania

  2. mSUGRA Points Proposed Post-LEP Benchmarks for Supersymmetry (hep-ph/0106204) High total SUSY cross section we can try to reconstruct masses with low integrated luminosity Massimiliano Chiorboli

  3. Point B Massimiliano Chiorboli

  4. (26 %) (35 %) (0.2 %) (60 %) p b b p Decay chain and event topology • Event final state: •  2 high pt isolated leptons OS •  2 high pt b jets • missing Et Massimiliano Chiorboli

  5. Events Production • SPYTHIA (PYTHIA 6.136) • CMSJET 4.703 No pile-up Massimiliano Chiorboli

  6. Events selection • at least 2 isolated leptons with pt>10 GeV and |h|<2.5 • at least 2 b-jets with pt>15 GeV and |h|<2 Massimiliano Chiorboli

  7. SUSY SM SUSY + SM Reconstruction of PYTHIA Signal CMSJET Massimiliano Chiorboli

  8. Reconstruction of Subtracting invariant mass of OSOF pairs eliminate tt and combinatorial bkg, but not Z+jet Other cuts Massimiliano Chiorboli

  9. Reconstruction of Massimiliano Chiorboli

  10. Reconstruction of Result of fit: Generated value: Massimiliano Chiorboli

  11. reconstruction Massimiliano Chiorboli

  12. Sbottom reconstruction reconstructed neutralino combined with the most energetic b-jet, assuming Mc1known Cutting on Etmiss allows to suppress the SM bkg Massimiliano Chiorboli

  13. Etmiss > 100 GeV Etmiss > 150 GeV Sbottom reconstruction 10 fb-1 2 sbottoms we can’t resolve the 2 peaks Massimiliano Chiorboli

  14. M(b) estimation Result of fit: Generated masses: Massimiliano Chiorboli

  15. Estimation of Mllbmax PYTHIA Signal total Massimiliano Chiorboli

  16. Estimation of Mllbmax Result of fit: Massimiliano Chiorboli

  17. Gluino Reconstruction Another b-jet is associated to the recostructed sbottom the b-jet closest in angle to the reconstructed sbottom is chosen Massimiliano Chiorboli

  18. Gluino Reconstruction Etmiss > 50 GeV Etmiss > 100 GeV Etmiss > 150 GeV Massimiliano Chiorboli

  19. Gluino Reconstruction Result of fit: Generated mass: Massimiliano Chiorboli

  20. Combinatorial suppression Massimiliano Chiorboli

  21. Gluino after angle cut 10 fb-1 Massimiliano Chiorboli

  22. Sbottom after angle cut 10 fb-1 Massimiliano Chiorboli

  23. Estimation of doesn’t depend on M(c10) ! Massimiliano Chiorboli

  24. Estimation of Result of fit: From the model: Massimiliano Chiorboli

  25. Sbottom and Gluino reconstruction With 40 fb-1 No angle cuts Only SUSY Etmiss > 150 GeV sbottom gluino Massimiliano Chiorboli

  26. Generated values With 40 fb-1 sbottom Massimiliano Chiorboli

  27. With 40 fb-1 gluino Generated value Massimiliano Chiorboli

  28. With 40 fb-1 no f cut Massimiliano Chiorboli

  29. m0 120 GeV g 919.8 tL 589.4 m1/2 375 GeV bL 723.0 tR 800.8 tan b 20 bR 771.3 c40 545.3 A0 0 sign m + qL 814 c30 532.4 qR 780 c20 294.8 lL 299.6 c2± 546.1 lR 193.4 c1± 294.5 c10 = LSP 152.5 Point G Massimiliano Chiorboli

  30. (26 %) (44 %) (8.8 %) Point G Massimiliano Chiorboli

  31. Conclusions Point B, with 10 fb-1 • estimation of M(l+l-)max • estimation of M(l+l-b)max • sbottom reconstruction with Resol. ~ 10 %, but 2 sbottoms not resolved • gluino reconstruction with Resol. ~ 12 % • M(g) - M(b) estimation, independent from M(c10), with Err ~ 7 % Point G, with 60 fb-1 • No sbottom reconstruction, needs more investigation Massimiliano Chiorboli

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