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Missing E T & Data Quality

Missing E T & Data Quality. Coherent treatment of Calo for jet/met/e.m. objects for p13 Missing E T distributions Run selections P14 upgrades. Proposal for p11-p13…. All analyses based on p13 should NOT use the unclustered energy in the CH (layers 15,16,17)

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Missing E T & Data Quality

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  1. Missing ET & Data Quality Coherent treatment of Calo for jet/met/e.m. objects for p13 Missing ET distributions Run selections P14 upgrades G. Bernardi, S. Trincaz LPNHE - Paris

  2. Proposal for p11-p13… All analyses based on p13 should NOT use the unclustered energy in the CH (layers 15,16,17) They should use the CH cells only when they are in towers which are part of a jet satisfying the Jet-Met Criteria. Proposal has been adopted by the different physics analyses. Which threshold to apply to Cells (0, 100 MeV)? G. Bernardi, S. Trincaz LPNHE - Paris

  3. Technically realized by: 1) Computing an initial missing transverse energy MET-0 (x,y,z components) using all cells of the CAL block in layers between 1 and 14 and of positive energy or negative energies, provided that they belong to a tower of global positive energy. Here a tower is constructed as usual with all layers. 2) Adding to MET-0 the 4-momentum of each jet satisfying the Jet-Met quality criteria weighted by its coarse hadronic fraction. In this way we add only the CH energy of the "good" jets, since the rest of the energy has already been included in the inclusive computation and since we don't want to include the CH energy of "fake" jets. (there is the small bias due to the difference between pTch and pTjet direction, negligible compared to bias due to full CH effect, and which can be corrected if needed) 3) Correcting the missing transverse energy according to the standards jet and e.m.-objects corrections, and for the presence of good muons. G. Bernardi, S. Trincaz LPNHE - Paris

  4. 100 MeV or 0 Mev Threshold ? one entry per run. 0 MeV 100 MeV Mean MET-x (no CH) 100 MeV protects against some patho- logies. Useful at the beginning, thr.will be set to 0 MeV in p14  MET-0 (no CH) 0 MeV 100 MeV RMS MET-x (no CH) G. Bernardi, S. Trincaz LPNHE - Paris

  5. 0 MeV vs 100 MeV threshold Mean of METN/METC METN : 0 MeV threshold, all layers, Compared to METC: 100 MeV threshold, all layers. All P13.04-P13.05 data RMS of METN/METC 100 MeV is indeed better… G. Bernardi, S. Trincaz LPNHE - Paris

  6. August-October Run Selection one entry per run. METC-x (1-17) METD-x (1-14) Mean MET-x (no CH) 159 run selected METC-y METD-y RMS MET-x (no CH) G. Bernardi, S. Trincaz LPNHE - Paris

  7. METB (“no”CH) vs METC (withCH) one entry/run. METC-x METB-y Mean MET-x METB is much more stable than METC. Main effect is removal of CH. P13.04 – P13.05 data METC-y METB-y Mean MET-y G. Bernardi, S. Trincaz LPNHE - Paris

  8. METB and SETB (mean, RMS) G. Bernardi, S. Trincaz LPNHE - Paris

  9. METx and y, < > and RMS G. Bernardi, S. Trincaz LPNHE - Paris

  10. METB-y vs METC-y G. Bernardi, S. Trincaz LPNHE - Paris

  11. Good Run Definition Only Runs with >= 1000 events are considered. (451 runs, p13.04/05) RUNS from 164537 to 170244 Define the average shift: MET-xy = sqrt [ (<MET-x>)2 +(<MET-y>)2] For a GOOD RUN: 1) Require MET-xy < 3 GeV 2) Require mean scalar ET between > 80 GeV. 3) Require stable RMS of METx and y (< 11 GeV in average)  RUN SELECTION released last week. With full statistics, use MET-xy < 5 GeV in all files of a run, and MET-xy < 3.5 GeV in average. RMS-xy < 16 GeV in all files of a run RMS-xy < 14 GeV in average. G. Bernardi, S. Trincaz LPNHE - Paris

  12. More Lumi for Moriond? MORIOND sample: mid-august to January shutdown lumi runs: 877; 756 > 1000 Event Events 166966231 Live fraction 0.79 Recorded Lumi 66258 nb-1 (delivered 82.5 pb-1) AVAILABLE in P13.04 –P13.06 (7th of February) PRELIMINARY kept: 538 Runs on a total of 606 reconstructed with p13.04-06 kept: 131360804 Events on a total of 144545766 fraction:0.91 kept: 54048.3 nb-1 of Recorded Lumi on a total of 58662.4 nb-1 G. Bernardi, S. Trincaz LPNHE - Paris

  13. Upgrades for P14 Implement at reco level the MET proposed treatment for p13 (same cells used up to layer 14 for MET, Jets, e.m. objects. Rejection of unclustered energy in CH): remodel MET block: 1) Phase out Towers computations (METT kept) 2) Store more info at cell Level: METC, METD (1-14), METNG, MET42, METNADA METCH, METEM, METFH, METMG, METICD  Store combined px,py,pz of CH cells in each jet (A,B) in order to easily create META or METB. enhanced NADA in CH layersnew T42 algorithm to reduce low energy noise G. Bernardi, S. Trincaz LPNHE - Paris

  14. Scalar ET G. Bernardi, S. Trincaz LPNHE - Paris

  15. METB-x vs METC-x G. Bernardi, S. Trincaz LPNHE - Paris

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