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First look into sbottom and gluino reconstruction

First look into sbottom and gluino reconstruction. Massimiliano Chiorboli University and INFN Catania. m (GeV). m (GeV). 299.2. 273.4. 275.0. 94.5. 309.3. 95.0. > 300. 44.5. SUGRA parameters. p. b. b. p. Decay chain and event topology. Event final state:

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First look into sbottom and gluino reconstruction

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  1. First look into sbottom and gluino reconstruction Massimiliano Chiorboli University and INFN Catania

  2. m (GeV) m (GeV) 299.2 273.4 275.0 94.5 309.3 95.0 > 300 44.5 SUGRA parameters Massimiliano Chiorboli

  3. p b b p Decay chainand event topology • Event final state: • 2 high pt isolated leptons OS • 2 high pt b jets • missing Et Massimiliano Chiorboli

  4. Signal SUSY bkg 1’088’000 65’000 2’005’000 72’000 531’000 SM bkg 28’000 1’860’000 51’000 Events production • SPYTHIA (PYTHIA 6.136) • CMSJET 4.703 3 fb-1 Massimiliano Chiorboli

  5. Events selection Events % • at least 2 isolated leptons with pt>15 GeV and |h|<2.4 • at least 2 b-jets with pt>15 GeV and |h|<2 27’228 1.4 54’216 5.0 3’765 0.7 48 <0.1 165 0.6 10 10-4 400 0.5 1’302 <10-4 Massimiliano Chiorboli

  6. Reconstruction of is forbidden SUSY • invariant mass of e+e- and m+m- • due to kinematics, the distribution shows an edge Massimiliano Chiorboli

  7. Reconstruction of 85929 SUSY Subtracting invariant mass of OSOF pairs eliminate SM and combinatorial bkg Massimiliano Chiorboli

  8. estimation Massimiliano Chiorboli

  9. signal bkg Sbottom reconstruction Massimiliano Chiorboli

  10. Sbottom reconstruction (II) reconstructed neutralino combined with the most energetic b-jet, assuming Mc1known Massimiliano Chiorboli

  11. Sbottom reconstruction (III) Assuming M(c10) = 44.5 GeV At the moment, no jet energy correction Massimiliano Chiorboli

  12. Gluino reconstruction • combination of the reconstructed sbottom and a b-jet • ~ 10 % of the selected events have >2 b-jets the b-jet closest to the reconstructed sbottom is chosen Massimiliano Chiorboli

  13. Gluino reconstruction (II) Massimiliano Chiorboli

  14. Gluino reconstruction (III) Massimiliano Chiorboli

  15. Gluino reconstruction (IV) • Cut on this angle to select the b-jet coming from the gluino Massimiliano Chiorboli

  16. Gluino reconstruction (V) Massimiliano Chiorboli

  17. Sbottom and gluino after cuts (cos f > 0.8) Massimiliano Chiorboli

  18. evaluation Massimiliano Chiorboli

  19. evaluation (II) Massimiliano Chiorboli

  20. Dependence from c10 mass assumed to be known Massimiliano Chiorboli

  21. Results within 3 fb-1 Massimiliano Chiorboli

  22. Future plans • Scanning the mSUGRA parameters plane • Including the jet energy correction • Improving the cuts • Studying this decay chain as a benchmark channel for the b-tagging Massimiliano Chiorboli

  23. Gluino reconstruction Massimiliano Chiorboli

  24. Sbottom reconstruction Assuming M(c10) = 44.5 GeV At the moment, no jet energy correction Massimiliano Chiorboli

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