Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori1 Di-jet mass with LOSS = 2 vs 1 in CMSIM120 Shuichi Kunori U. of Maryland 25-Oct-2001 PRS: Physics.

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Presentation transcript:

Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori1 Di-jet mass with LOSS = 2 vs 1 in CMSIM120 Shuichi Kunori U. of Maryland 25-Oct-2001 PRS: Physics Reconstruction and Selection HCAL/JetsMET group

Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori2 GEANT Parameter LOSS GEANT parameter: LOSS 1 Continuous energy loss with generation of  -rays above DCUTE (common /GCUTS/) and restricted Landau fluctuations below DCUTE.  Default for HCAL in CMSIM123 with DCUTE=1MeV. 2 Continuous energy loss without generation of δ -rays and full Landau-Vavilov-Gauss fluctuations. In this case the variable IDRAY is forced to 0 (i.e. no  -ray production) to avoid double counting of fluctuations.  Default for all detectors through CMSIM122.  Default for detectors outside HCAL in CMSIM123.

Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori3 Response to Single Pion Pal, talk on 01-Aug-01 Event at 500GeV is obviously unphysical. GEANT deposited 5GeV in a scintillator tile. The energy loss was supposed to be due to production of a  -ray at that point, and  -ray would exit from the scintillator and dump most of energy in absorbers. In CMSIM-ORCA, 5GeV x (sampling weight ~ 100) = 500GeV! CMSIM120 LOSS=2

Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori4 Di-jet mass for Z’(120) (Weimin Wu, Pal Hidas) Z’(jj) mass with FULL Detector LOSS  (%) % in > % % LOSS 1 LOSS 2 No difference In mass resolution! (Above result was obtained with F77 code for jet reconstruction. ORCA produced consistent result, 14.9%. ) ab

Jet/MET without JetMET meeting, 25-Oct-2001, S.Kunori5 Beyond mass resolution What do we know now? 1. Salavat looked at jets in HLT sample (CMS120) and did not find clearly unphysical events in jets. 2. Pal looked at MET vs. Pt-hat in HLT sample (CMS120) and did not find clearly unphysical events. 3. We continue to look for clear unphysical events in HLT sample. 4. We will check correlation between MET direction and “unphysical jet” in HLT sample K min-bias events have been produced with LOSS=1 for comparison. 6. Future production (CMS123 and later) will use LOSS=1 in HCAL.