1 / 27

Effect of HO in MET resolution in 2012 data

Effect of HO in MET resolution in 2012 data. Jet/Run2012A/RECO CMSSW_5_3_2 GR_R_52_V9 JetHT/Run2012B,C,D/RECO CMSSW_5_3_4_patch2 GR_R_53_V16 Standard json Standard Jet/MET filter

dianne
Download Presentation

Effect of HO in MET resolution in 2012 data

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Effect of HO in MET resolution in 2012 data • Jet/Run2012A/RECO CMSSW_5_3_2 GR_R_52_V9 • JetHT/Run2012B,C,D/RECO CMSSW_5_3_4_patch2 GR_R_53_V16 • Standard json • Standard Jet/MET filter • primaryVertexFilter, noscraping, HBHENoiseFilter, CSCTightHaloFilter, hcalLaserEventFilter, EcalDeadCellTriggerPrimitiveFilter , goodVertices, trackingFailureFilter, eeBadScFilter + • No correction on Jet/MET, after inclusion of HO, one need to recalculate everything again. • Preselected events with • No noisy Readout Module (based on Run2012A) • Atleast one jets with Pt>50 GeV and ||<1.7 • Atleast one HO tower with Energy >5.0 GeV, irrespective of any jet in that direction or not. Typical fraction of event (Jet2012A) : Out of 1M events only 31617 events survived these criteria (430K for only Jet crit).

  2. Event selection • Further selection of events with 0.1<EMFrac<0.9 for leading jet, to remove ECAL/HCAL noise • Events with at least two jets (Pt>50 GeV and ||<2.9) and |12| > /2 • Events are categorised into three parts • Signal : Behind a jet (pt>50, |R|<0.3 • Background : Outside any jet (R|>0.7) of Pt >40 GeV • Others • HO time profile with reduced/increased MET value • MET, with and without HO

  3. Average HO signal peak and RMS (in GeV) 2012B 2012A 2012C 2012D RMS is increased with time

  4. Noisy Readout Module (2012A) • Looked for number of channels with different energy threshold in a readout module (RM), there are 18 towers in each RM in Ring1 Remove events if any of these RM has more than 8 towers with E>2 GeV

  5. HO signal/background spectrum 2012B Normalised signal and noise shape in different rings • Noise shows larger energy spectrum. Thus used threshold 200 and 150 GeV for Ring0 and Ring1 respectively. • Low energy, behaviour is slightly different Ring 0 Ring 1 Ring+1 Signal Noise

  6. HO signal/background timings 2012B Normalised signal and noise time in different rings • For ring1, -20<time<40 Ring 0 Ring 1 Ring+1 Signal Noise

  7. HO signal/background spectrum 2012A 200C • Noise shows larger energy spectrum. R1 has lower tails in timing Normalised signal and noise shape in different rings R0 R1 R+1 R0 R1 R+1 Normalised signal and noise timings in different rings

  8. HO DIGI signal in 2012A : Ring 1 Signal background, inter for various energy range of HO tower [0-10] [10-20] [20-30] [20-40] [40-50] [50-60] [60-70] [70-80] [80-90] [90-100] [100-110] [>110] • There is no difference in shape HO signals/background, noise in photo-electron level or in previous stage, which is less likely

  9. HO DIGI signal in 2012A : Ring +1 Signal background, inter for various energy range of HO tower [0-10] [10-20] [20-30] [20-40] [40-50] [50-60] [60-70] [70-80] [80-90] [90-100] [100-110] [>110] • There is no difference in shape HO signals/background, noise in photo-electron level or in previous stage, which is less likely

  10. HO DIGI signal in 2012A : Ring 0 Signal background, inter for various energy range of HO tower [0-10] [10-20] [20-30] [20-40] [40-50] [50-60] [60-70] [70-80] [80-90] [90-100] [100-110] [>110] • There is no difference in shape HO signals/background, noise in photo-electron level or in previous stage, which is less likely

  11. HO DIGI signal for change in MET (without – with HO) Atleast one HO tower with energy >30 GeV 2012A Ring-0 Highest, Ring-0 others, Ring1 Highest Ring1 others 100:80 <100 >100 80:100 • No correlation with MET

  12. PF Jet/MET reconstruction • Use standard PFAlgorithm, where HO are included, but thresholds of HO are not optimised yet. • Use different thresholds for seed tower and different for Ring-0 and Ring 1 (in GeV) Effort from GM S. Ghosh P. Janot Def RECO : CMSSW_5_2_x : Without HO CMSSW_5_3_x : With HO (Ring0 and Ring1)

  13. Calo Jet/MET reconstruction • One can not use standard algorithms, which included all HO towers in MET • Modify reconstruction code with a bias. • Use only HO towers, which are behind (|R|<0.5) a jets of Pt>50 GeV • Use different thresholds for Ring-0 and Ring 1 (in GeV), need to modify reco code to have different threshold for Seed towers and others for clustering Do not use calo object with HO in default reconstruction It includes all HO objects irrespective of it is associated with any HCAL tower or with any tracks, which enhance the noise rates In PF Algorithm, a HO tower is used only when it is associated with a HB cluster

  14. PFMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> For low MET value, HO does not have any effect. Jet/Met resolutions are much larger than average HO signals

  15. PFMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> At this level of MET, we see some effects with HO, but this is negligible fraction

  16. PFMET with and w/o HO for criteria (2012A) MET without HO -----------------------------> MET with HO -----------------------------> At this level of MET, we see some effects with HO, but this is negligible fraction

  17. PFMET with and w/o HO for criteria (2012C) MET without HO -----------------------------> MET with HO -----------------------------> At this level of MET, we see some effects with HO, but this is negligible fraction

  18. Characteristics of an event, where HO increases the MET value (Both Jets have shower leakage) Jet1 Jet2 Noise (in One HPD, but pixels are geometrically far apart) Details are in attached file (hocond_526_time.pdf)

  19. An interesting event : PFRootEvent Display No track (Pt > 500 MeV) along HB+HO jets No track (Pt > 2GeV) in this event

  20. Conclusion • Signal and noise shape in HO are nearly same. Thus timing/shape might help to remove HO noise. Can not utilise shape to reduce background/noise • Use HO with energy threshold as low as 2 (5GeV) in Ring-0 (1) towers • Preferable to use only Ring-0 towers, with maximum signal in one tower is 200 GeV • For Ring1, threshold is 150 GeV, beyond that do not expect any signal and also timing is restricted between 15ns to 40ns • Need proper cleaning/noise filter, RM/RBX • Improvement of Jet/MET performance with HO, though effect is very little. But, can be use only in search, where events has large MET or Jet Pt imbalance. That also gives a bias in search result. • This can be a starting point for 13-14 TeV run, where HO will be more useful and HO was built for that energy. Will document all these as a DN

  21. CaloMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> For low MET value, HO does not have any effect. Jet/Met resolutions are much larger than average HO signals

  22. tcMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> For low MET value, HO does not have any effect. Jet/Met resolutions are much larger than average HO signals

  23. CaloMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> At this level of MET, we see some effects with HO, but this is negligible fraction

  24. tcMET with and w/o HO for criteria (2012B) MET without HO -----------------------------> MET with HO -----------------------------> At this level of MET, we see some effects with HO, but this is negligible fraction

  25. HO signal and pedestal in few Ring 0 towers • Looks a fine Signal noise

  26. HO signal and pedestal in few Ring1 towers • Looks a fine Signal noise

More Related