Scan of Recent high MET events

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1 Scan of Recent high MET events Jordan Damgov, Chiyoung Jeong Sung-Won Lee Texas Tech University MET working group meeting 12 Nov, 2010

2 Data sets, Events selection Dataset (PD): /METFwd/Run2010B-PromptReco-v2/RECO /Electron/Run2010B-PromptReco-v2/RECO /Mu/Run2010B-PromptReco-v2/RECO Runs range: JSON file: Cert_ _7TeV_StreamExpress_Collisions10_JSON.txt Integrated luminosity : 17.8 pb-1 Event selection(skims) provided by Dinko: -Good vertex -Scraping event veto -HBHE noise filter (from ICHEP) -CMSSW 38X (X<6) 2

3 Skims /METFwd/Run2010B-PromptReco-v2/RECO PFMET>700 GeV --> total of 45 events PFMET>100 GeV and TCMET/PFMET< > total of 22 events TCMET>600 GeV and PFMET/TCMET< > total of 35 events /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events PFMET>100 GeV and TCMET/PFMET<0.3 --> total of 23 events TCMET>100 GeV and PFMET/TCMET< > total of 27 events /Mu/Run2010B-PromptReco-v2/RECO PFMET>700 GeV --> total of 32 events PFMET>300 GeV and TCMET/PFMET< > total of 23 events TCMET>300 GeV and PFMET/TCMET< > total of 30 events Total: 264 events 3

4 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>700 GeV --> total of 45 events HCAL noise Beam Halo HPD/RBX/Ion Beam Halo Cosmics Physics Cosmic Muons Tools, which are able to remove most of those events: Beam Halo filter Ronny Remington Improved HB/HE noise filter John Paul 4

5 /METFwd/Run2010B-PromptReco-v2/RECO TCMET>600 GeV and PFMET/TCMET< > total of 35 events 32/35 are ECAL barrel boundary spiks, which are not cleaned in the skim. 3/35 are ECAL endcap isolated crystals with high energy. 2 events are the same crystal (EE+). Those 3 events are seen as photons. ECAL Endcap ECAL Barrel R E R E R E

6 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events There are several categories of events Events with Jet in HE, close to Eta=3 boundary. pfjet Pt is typically reconstructed as 1.5 times larger than calo/jpt Jet Pt. Sample is provided to PF experts for inspection. 12 out of 22 events. pfjet Pt = 170 GeV JPTJet Pt = 181 GeV pfmet = 132 GeV calomet = 71.5 GeV tcmet = 19.4 GeV in HE, Jet Eta=2.9 pfjet Pt = 285 GeV JPTJet Pt = 191 GeV 6

7 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events There are several categories of events Muon in jet is reconstructed and participates in tcmet calculation, but not in pfmet. Usually muon is not cleanly reconstructed in the muon system. 3 out of 23 events. pfmet=123.9 GeV tcmet=7.8 GeV Muon Pt = GeV 7

8 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events 3 out of 22 events have PF ECAL over-cleaning. One of which is in ECAL endcap. pfmet = 215 GeV calomet = 47.6 GeV tcmet = 20.6 GeV ak5calojet Pt=287, EMF=0.997 pfjet Pt = 73 GeV ak5calo Jet Pt = 235 GeV ak5pf Jet Pt = 277 GeV EE Crystals View 214 8

9 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events There is also combined ECAL over-cleaning pfmet = 200 GeV calomet = 34.3 GeV tcmet = 16.4 GeV Detected by scanning ECAL RecHit flags Non-PF ECAL over-cleaning pfjet Pt = 19 GeV CaloJet Pt 102 & 76 GeV 15 EE Crystals View ak5calojet Pt=207, EMF= PF ECAL over-cleaning 17 9

10 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events Miss-measured muon in pfmet known issue fixed in CMSSW 39X 2 events. pfmet = GeV calomet = 7.2 GeV tcmet = 3.7 GeV Muon Pt = GeV 10

11 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events High Pt jets event Miss-measured tcmet? Needs tcmet expert s attention. pfmet= 138.4, tcmet=10.9, calomet = 88.2 GeV pfjet Pt=854.5 Close to HBHE gap Muon Pt=5.5 GeV 11

12 /METFwd/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET< > total of 22 events Summary for the sample: 12 pf Jet at Eta muon in tcmet, but not in pfmet 3 ECAL overcleaning in pfmet 2 mismeasured muon in pfmet 1- mismeasured tcmet? 1- ECAL overcleaning(2xtals) + 2 muons misreconstruction (one triple, one double ) pfmet phi is along over-cleaning direction. Jets Pt ~ GeV. Barrel jet s activity total 12

13 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events 10 events with ECAL over-cleaning + 1 PF ECAL over-lining Single high energy crystal case Detected by scanning ECAL RecHit flags pfmet = 313GeV calomet = GeV tcmet = GeV EB crystals ak5calojet Pt = 482 GeV ak5calojet Pt = 240 GeV Photon = 423 GeV

14 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events Multi-Xtal s over-cleaning in the same cluster. Detected by scanning ECAL RecHit flags ak5calojet Pt1 = 360GeV Pt2 = 108 GeV pfmet = 343 GeV calomet = 256 GeV tcmet = 370 GeV EB crystals ak5calojet Pt = 220 GeV Photon = 506 GeV 14

15 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events There are also inactive areas in ECAL Photon Reco Eff. ECAL Barrel QCD Inactive area 5x5 crystals dead/masked Over-cleaning 15

16 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events MET could be also reduced by ECAL over-cleaning pfmet = 292 GeV calomet = 252 GeV tcmet = 291 GeV ak5calojet Pt = 98 GeV ak5calojet Pt = 171 GeV Photon/El 280 GeV ECAL ove-rcleaning Pt = 123 GeV 16

17 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events HCAL over-cleaning in PF? ak5pfjet Pt = 144 GeV pfmet = 307 GeV calomet = 71 GeV tcmet = 54 GeV ak5calojet Pt = 394 GeV EMF=

18 /Electron/Run2010B-PromptReco-v2/RECO PFMET>270 GeV --> total of 27 events Summary for the sample: 11 ECAL over-cleaning (including 1 PF ECAL overcleaning) 4 - mis-measured muons in pfmet 1- HCAL over-cleaning in PF 11 Physics total 18

19 /Electron/Run2010B-PromptReco-v2/RECO TCMET>100 GeV and PFMET/TCMET< > total of 27 events 26 out of 27 events look like bad channel in ECAL Endcap, which is cleaned in pfmet, but not for calo/tcmet. Those are reconstructed as photons Bad EE channel position (eta,phi)=(2.575,-0.742),(1.785,2.138) Isolated crystal ET=450 GeV 19

20 /Electron/Run2010B-PromptReco-v2/RECO TCMET>100 GeV and PFMET/TCMET< > total of 27 events pfmet = 0.6 GeV tcmet = GeV calomet = 61.1 GeV The 1 out of 27 which is not ECAL Endcap issue HF cleaning flags are raised for several Towers noise overlapping with jet, PF recovered hits -checked by Dinko ak5calojet 21.7 GeV ak5pfjet GeV tcmet ak5calojet 63.7 GeV ak5pfjet GeV ak5calojet 22.2 GeV ak5pfjet 30.4 GeV 20

21 /Electron/Run2010B-PromptReco-v2/RECO PFMET>100 GeV and TCMET/PFMET<0.3 --> total of 23 events Summary for the sample: 12 pf Jet at Eta muon in tcmet only 5 mismeasured muon in pfmet 2 ECAL overcleaning in pfmet 3 uncategorized (PF jet mismeasure (electron), HBHE noise +ecal overcleaning,barrel-endcap baundary ) total 21

22 /Mu/Run2010B-PromptReco-v2/RECO PFMET>700 GeV --> total of 32 events 29/32 mismeasured muon, included in pfmet fixed in CMSSW39X (7/29 included in tcmet) 3/32 - cosmics /Mu/Run2010B-PromptReco-v2/RECO PFMET>300 GeV and TCMET/PFMET< > total of 23 events 17/23 mismeasured muon, included in pfmet 6/23 - cosmics 22

23 /Mu/Run2010B-PromptReco-v2/RECO TCMET>300 GeV and PFMET/TCMET< > total of 30 events 25/30 EE bad channel (same for most of the events) 2/30 EB border spikes 3/30 mismeasured muon Muon Pt = 5.5 GeV EE bad channel 23

24 Summary 264 events with high MET from 3 different PD are visually inspected (/METfwd, /Electron, /Mu) Main sources of high MET are: -HBHE noise -Beam Halo -Cosmics -mismeasured muons (fixed in 39X for pfmet) -Ecal over-cleaning (fixed in 386 re-reco (?)) 24

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