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Jet+Gap Event Analysis at University of Manchester: QCD Discussion Sep 7, 2003

Explore jet+gap triggered data analyzed by T. Edwards for QCD studies using exclusive samples. Detailed investigation of jet triggers and gap events. Discussion includes cone jets, pT, Eta, MET, vertices, and calorimeter energy. Future steps outlined for further analysis.

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Jet+Gap Event Analysis at University of Manchester: QCD Discussion Sep 7, 2003

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  1. Jet + Gap Events Tamsin Edwards University of Manchester QCD7th Sep 2003

  2. Jet + Gap triggered data • Use skimmed thumbnails from Pavel Demine • reconstructed with p13 • whole skim is Apr 15-Jun 24 2003 (trigger lists v8-11) • This talk: part of skim, Runs 175757 - 178102 (probably not all events in these runs if skim is randomised) • Analyse jet+gap triggers: • JT_25TT_NG - 25GeV jet • JT_25TT_GAPN - 25GeV jet + North Luminosity Monitor off • JT_25TT_GAPS - 25GeV jet + South LM off • JT_35TT_GAPSN - 25GeV jet + both LM off T.Edwards QCD

  3. Event selection Made four exclusive samples from these: # events • JT_25TT_NG 7602 • that did not fire a GAP trigger 195 • - add GAP triggers that also fired fastz/ahalo/phalo 225538 • TOTAL no gap:225733 • JT_25TT_GAPN 491096 • that did not fire GAPSN trigger 396432 • that also did not fire fastz/ahalo/phalo = TOTAL GAP N: 222164 • JT_25TT_GAPS 494173 • - that did not fire GAPSN trigger 399509 • - that also did not fire fastz/ahalo/phalo = TOTAL GAP S: 348454 • JT_25TT_GAPSN 95466 • - that did not fire fastz/ahalo/phalo = TOTAL GAP SN: 95251 T.Edwards QCD

  4. Number of cone jets no gap gap south/north gap north gap south T.Edwards QCD

  5. pT of cone jets no gap gap south/north gap north gap south T.Edwards QCD

  6. Eta of cone jets no gap gap south/north gap north gap south T.Edwards QCD

  7. METC no gap gap south/north gap north gap south T.Edwards QCD

  8. METx no gap gap south/north gap north gap south T.Edwards QCD

  9. METy no gap gap south/north gap north gap south T.Edwards QCD

  10. SETC no gap gap south/north gap north gap south T.Edwards QCD

  11. Number of vertices no gap gap south/north gap north gap south T.Edwards QCD

  12. Forward energy in calorimeter • Energy sum and Multiplicity of calorimeter cells: • in EMlayers or EM+FH layers • in forward region 2.7 < |η| < 4.45 • above energy threshold: • EM E > 50MeV • FH E >100MeV T.Edwards QCD

  13. EM energy sum no gap gap south/north south north T.Edwards QCD

  14. EM+FH energy sum no gap gap south/north south north T.Edwards QCD

  15. EM energy sum gap south gap north south north T.Edwards QCD

  16. EM+FH energy sum gap south gap north south north T.Edwards QCD

  17. EM Multiplicity no gap gap south/north south north T.Edwards QCD

  18. EM Multiplicity gap south gap north south north T.Edwards QCD

  19. EM Multiplicity vs Energy sum no gap gap south/north south north T.Edwards QCD

  20. EM+FH Multiplicity vs Energy sum no gap gap south/north south north T.Edwards QCD

  21. EM Multiplicity vs Energy sum gap south gap north south north T.Edwards QCD

  22. EM+FH Multiplicity vs Energy sum gap south gap north south north T.Edwards QCD

  23. Next step • Re-run over full p13 sample: • only use JET/MET good runs • only look at JET/MET good jets • apply calorimeter gap definition to confirm LM gaps T.Edwards QCD

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