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Analysis of Two and Three Jet MET Signatures at 10 TeV with 10 pb⁻¹ in ATLAS

This report presents initial analyses of two-jet and three-jet events paired with missing transverse energy (MET) at 10 TeV, utilizing 10 pb⁻¹ of data. The study covers the selection of Monte Carlo samples, various phase space cuts, and preliminary results including effective mass (Meff) and MT2 distributions. The findings suggest that light SUSY could be discoverable if enough statistics and understanding of the detector are available. Future work includes further background determinations and trigger studies to enhance the understanding of MET signatures.

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Analysis of Two and Three Jet MET Signatures at 10 TeV with 10 pb⁻¹ in ATLAS

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  1. - initial look at the two- and three-jets+MET (CSC-style) analyses with 10pb-1 - Jets+MET @ 10TeV • ATLAS SUSY meeting • MET signatures subgroup, 24 Sept’08 - Alan Barr, Claire Gwenlan (Oxford) • Outline • MC samples/selection cuts • initial results • summary/future work

  2. MC samples/selection cuts MC samples: • v12 fullsim samples, as used in CSC note 5 (full list in backups) • these samples generated at 14TeV -> reweight PDFs to 10TeV [as described: http://indico.cern.ch/conferenceDisplay.py?confId=33528 (C. Gwenlan) ] Cuts:[two-/three-jet+MET analyses @ 10TeV, with 10pb-1] • look at “loose”, “medium” and “tight” phase space cuts (see below) • [as proposed by S. Caron: http://indico.cern.ch/conferenceDisplay.py?confId=38731] • [other cuts as in CSC note 5(for now; see backups for full list) ] MET>80 GeV in all cases Jets+MET at 10TeV with 10pb-1

  3. Results (i): Meff 10TeV, 10pb-1 two-jet+MET [all cuts incl. J70_XE70 trigger] Jets+MET at 10TeV with 10pb-1

  4. Results (ii): Meff 10TeV, 10pb-1 three-jet+MET [all cuts incl. J70_XE70 trigger] Jets+MET at 10TeV with 10pb-1

  5. Results (iii): MT2 Jets+MET at 10TeV with 10pb-1

  6. Results (iv): MT2 Jets+MET at 10TeV with 10pb-1

  7. summary/future work in principle, light SUSY discoverable with 10pb-1 at 10TeV … IF enough statistics (and sufficient understadning of the detector!) to determine backgrounds to resonable precision Next steps: - background determinations - trigger studies Jets+MET at 10TeV with 10pb-1

  8. Extras Jets+MET at 10TeV with 10pb-1

  9. MC samples (backgrounds) Jets+MET at 10TeV with 10pb-1

  10. MC samples (signal) Jets+MET at 10TeV with 10pb-1

  11. Reminder: PDF reweighting • hadronic cross section given by: for a particular kinematic configuration with s, t, u, should just need to change the probability that incoming partons *had* that configuration i.e. just a PDF re-weight proton PDFs hard subprocess cross section Re-weight MC to 10 TeV using: pTJet,1,2 >150,100 GeV xi : x of parton i at 14TeV; x i’: x of parton i at 10TeV Jets+MET at 10TeV with 10pb-1

  12. selection cuts Cuts:[two-/three-jet+MET analyses @ 10TeV, 10pb-1] “loose”, “medium” or “tight” (as given below) as in CSC5 (for now) Jets+MET at 10TeV with 10pb-1

  13. Results (extras): Two-Jet+MET[Meff analysis] various SUX signal MC compared to total SM background Jets+MET at 10TeV with 10pb-1

  14. Results (extras): Three-Jet+MET[Meff analysis] various SUX signal MC compared to total SM background Jets+MET at 10TeV with 10pb-1

  15. Results (i): Meff 10TeV, 10pb-1 two-jet+MET [all cuts except trigger] Jets+MET at 10TeV with 10pb-1

  16. Results (ii): Meff 10TeV, 10pb-1 three-jet+MET [all cuts except trigger] Jets+MET at 10TeV with 10pb-1

  17. Results (iii): MT2 10TeV, 10pb-1 two-jet+MET [jet-pT, lepton veto cuts only] Jets+MET at 10TeV with 10pb-1

  18. Results (iv): MT2 10TeV, 10pb-1 two-jet+MET [jet-pT, lepton-veto, MET cuts only] Jets+MET at 10TeV with 10pb-1

  19. Results (v): MT2 10TeV, 10pb-1 two-jet+MET [jet-pT, lepton-veto, MET cuts and J70_XE70 trigger] Jets+MET at 10TeV with 10pb-1

  20. Results (vi): MT2 10TeV, 10pb-1 three-jet+MET [jet-pT, and lepton-veto cuts only] Jets+MET at 10TeV with 10pb-1

  21. Results (vii): MT2 10TeV, 10pb-1 three-jet+MET [jet-pT, lepton-veto, MET cuts only] Jets+MET at 10TeV with 10pb-1

  22. Results (viii): MT2 10TeV, 10pb-1 three-jet+MET [jet-pT, lepton-veto, MET cuts and J70_XE70 trigger] Jets+MET at 10TeV with 10pb-1

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