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Electrons/photons: from detector to Ntuple

Electrons/photons: from detector to Ntuple. M. Jaffré LAL Orsay. Outline : L1 and L2 EM objects L3 electron/photon tools Electron/photons in D0Reco. Mrinmoy Bhattacharjee. L1 & L2 major challenges. Input Rate to L1 ~ 7.6MHz at 10 32 cm -2 s -1

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Electrons/photons: from detector to Ntuple

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  1. Electrons/photons: from detector to Ntuple M. Jaffré LAL Orsay • Outline : • L1 and L2 EM objects • L3 electron/photon tools • Electron/photons in D0Reco

  2. Mrinmoy Bhattacharjee L1 & L2 major challenges Input Rate to L1 ~ 7.6MHz at 1032cm-2s-1 <pT> e- for J/ee- <pT> e- for W,Z,top decays ~ 2.7 GeV/c central ~ 30-40GeV/c ~ 3.1 GeV/c forward Although threshold high Low threshold in CAL high QCD rate S/B ~ 1/50,000 NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  3. Definition of EM object (e-/) e = CFT trk + CPS cluster + CCEM Trigger Tower  = No Trk + CPS cluster + CCEM Trigger Tower Central Region Forward Region e = MIP + FPS cluster + ECEM Trigger Tower  = No MIP + FPS cluster + ECEM Trigger Tower NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  4. L1 electron algorithm (high pT) Central (1.6) 1 CPS cluster  high matched to 1 track 5GeV/c in 4.50 1 Calo EM tower  7-10GeV (1.6) matched to CPS cluster by quadrant Forward (1.62.6) 1 FPS cluster  high + MIP confirmation 1 Calo EM tower  7-10GeV (1.62.6) matched to FPS cluster by quadrant Track/MIP matching to PS optional; perform only if rates high  1.0 Cal EM>7GeV NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  5. L1 EM trigger rates (high pT) Rates at L=21032cm2/s Cluster/Track & CCAL Quadrant match Cluster & ECAL Quadrant match CEM(1,10,C) 200 W mass, QCD  CEM(1,7,C)CEQ(1)TNQ(1) 62 QCD  CEM(1,10,C)TEL(1,5) 3 W mass, WZ  CEM(1,10,N/S) 690 EC W mass CEM(1,10,N/S)FQN(1) 400 FWD EM CEM(1,10,N/S)FPQ(1) 200 EC W mass Rates highly dependent on thresholds in CAL Quadrant matching give 2-4 in rates rejection 1.0 NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  6. L2 EM triggers Advantages at L2 are: (1) Large decision time 100sec (2) Finer detector information available -- clustering in PS -- clustering in CAL (3) Due to more time finer matching can be performed -- L1 CAL/PS matching in quadrant -- L2 CAL/PS match within 0.20.2 in  NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  7. Marc Buehler L2 CAL Preprocessor L1 EM Trigger based on following reference set 2.5, 5, 7 & 10 GeV ET (1) L2 uses TT’s above low threshold ref. set (2) Find 2nd. Maximum in 33 around seed (3) ETEM = ETEMseed + ET2nd > Thr (4) EMF = ETEM/(ETEM+ETHAD) (5) TISO =  ET(EM+Had)/ETEM ( 33  - seed ) = ETEM/ET(EM+HAD) (33  includes seed) EMF>0.85 TISO < 0.4 PT =20GeV NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  8. L2 CAL Efficiency, Rates & Timing (In 1.62.6) L1 seed tower 7GeV / 10GeV ETEM  10GeV / 12GeV EMF  0.85 + TISO  0.4 pT 15Gev/c 20GeV/c 32.5GeV/c L2/L1 93.3% 99.5% 100.0% “ 86.0% 100.0% 100.0% Dijet Rates L1(1,7GeV) L2(1,10GeV) L2(1,12GeV) @2E32 900Hz 145Hz 90Hz L2 CAL Timing(available 50sec) L2 Seed cut 0.5GeV 1.0GeV 1.5GeV 2.0GeV # of seeds 77 19 10 7 Time s 179 46 25 18 NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  9. L2 electron algorithm (high pT) Central (1.6) (L2 Global 50sec) 1 CAL tower 7GeV 1 CPS Axial cluster  5MIPs + CFT Track tag CPS 3D match of X,U,V ,  (1) Axial ,U, V = 5MIPs (2) Axial = 5MIPs & U,V = 3MIPs Different detector info combined at L2 Global CPS-CAL match within 0.250.25 in  (1) efficiency loss for ET <40GeV (Z  ee, 93.7%) (W+Jets, 84.0%) (2) regains lost electrons at low ET (Z  ee, 99.0%) (W+Jets, 95.4%) NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  10. L2 electron algorithm (high pT) Forward (1.62.6) (L2 Global 50sec) CAL Cluster (ETEM)> 10GeV, CAL EMF 0.85 + CAL Isolation  0.4 FPS 3D match of U,V ,  (1) U, V = high (2) U = high & V = low OR vice versa Different detector info combined at L2 Global FPS, CAL matching within 0.250.25 in  Z  ee 94.3% - 97.5% (HH / HL.OR.LH) @ 21032cm2/s 900Hz 145Hz 80Hz NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  11. B Physics: di-electron trigger L1 & L2 Trigger Performance: Central Region (CAL EM>2.5GeV, CPS>3MIPs) eff (pT>1.5GeV) = 10%, Rates = 50Hz Forward region (CAL EM>2.5GeV, FPS>5MIPs) L1 eff (pT>1.5GeV) = 10%, Rates = 1.0-1.5KHz L2 eff (pT>1.5GeV) = 4-5%, Rates = 50Hz NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  12. L1 & L2 summary L1 Trigger electron (pT>5GeV) efficiency > 95% (7-10GeV CAL) background rates1.5 Hz (7GeV CAL thr) 200 - 500 Hz (10GeV CAL Thr) di-e (pT>1.5GeV) efficiency~ 20%(cen), 10%(fwd) background rates1-2kHz (cen+fwd) PS/CAL Quadrant matching 2-3 in rates L2 Trigger electron (pT>5GeV) efficiency > 95% (10GeV ETEM) background rates 50-100 Hz (10GeV ETEM) di-e (pT>1.5GeV) efficiency ~ 10%(cen),5%(fwd) background rates 100Hz (cen+fwd) CAL EMF, Isolation, Invariant mass helps PS/CAL 0.250.25 in  match = 2-3 in rates NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  13. Juan Estrada L3 Components Cal.Unpacker Charles Leggett CPS.Unpacker Andre Turcot FPS Unpack U.Michigan L3TPrVtx G. Lima Cal. Cluster Volker Buescher L3TCps Andre Turcot L3TFps U.Michigan L3TEle, L3TPhoton Volker Buescher Juan Estrada Vishnu Zutshi L3track framework Daniel Whiteson

  14. L3 Preshower Clustering • CPS ( A. Turcot ) • a review of algorithm performed last summer • Algorithm : - contiguous strips above threshold (2 MIPs) clustered in each layer ( Single Layer Cluster ) - 3D matching of SLC with some energy correlation • Localized clustering in  or - implemented to be used by L3 electron tool • CPS resolution for single e- (r) = 0.54 mm, (z) = 1.9 mm NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  15. CPS strip energy 2 MeV NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  16. L3TEle(L3TPhoton) • List of calorimeter clusters from the l3fcalcluster. • Possibilities: • EMFR cut. • Calorimeter cluster shape. • Longitudinal and transverse variables from CPS • Isolation • Track matching • Implemented • EMFR cut. • 4x4 Hmatrix (EM1,EM2,EM3,EM4) NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  17. Some plots from L3Tele Single 20 GeV electrons and pions Track-Cluster matching in W events EM fraction log 2 NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  18. L3 status • Functional tool exists to do L3 EM trigger. • Access to calcluster, CPScluster and tracks is now possible at L3. • Studies on the best way to use this variables are going on now. • Efficiency of L3Ele: 98% for 50GeV electrons with a EMFR cut. Factor of 50 rejection for 50GeV pions. (Not realistic, waiting for L2 Ele simulation). • Timing: • L3TEle: does not do anything that takes time just a few multiplications and a 1D cut • CalCluster: 2msec for a top event • Unpackers: studies pending (NTsystem) NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  19. Serban Protopopescu M.J. EMRECO algorithm • Cluster « finding » algorithms • 3 Clustering coded based on Towers : simple cone, cone and NN • Default now is simplecone R=0.4 (fast) • 4th algorithm based on cells CellNN almost ready interfaced to EMReco • Selection of calorimeter clusters • Ptmin > 1.5 GeV ; e.m. fraction > 90% • Isolation : (Etotal(cone 0.4) - Eem(cone0.2))/ Eem(cone0.2) < 0.2 • EMCluster definition (EM1,EM2,EM3,EM4,FH1) • CC : all channels in a (3x3) window • EC : all channels in a cone of 10 cm radius in EM3 around hottest channel in EM3 RCP parameters rather independent of clustering algorithm for isolated electrons NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  20. EC electrons • Results from D00Kee Cho (Rochester) 99% 12.5cm 10cm NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  21. EC electrons • Results from D00Kee Cho (Rochester) NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  22. EMRECO (cont ’d) • EMcluster position corrections (DooKee Cho) • CAL cell is given a weight : w=w0 + log(Ecell/Elayer) w0varies for each layer • Additional corrections depending on z and Pt (CC), on r (EC) • EMcluster energy corrections (Serban) • CPS : 15.0 x ECPS + 0.18 GeV • FPS : 15.3 x EFPS • Overall correction : E=E/(1.3 –SQRT(0.08+0.4418/E)) DE/E uncorr CPS energy fraction NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  23. Cluster position resolutions DooKee Cho NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  24. EMRECO (cont ’d) • Preshower matching • input : PS 3D clusters from cal_reco and fps_reco • select the most energetic cluster within a window : • x = 0.05x0.05 CPS x = 0.1x0.1 FPS • Track matching • input : ChargedParticleChunk • P>1.5 GeV/c; x window = 0.05x0.05 Window sizes can be reduced without loss of efficiency • Emparticle direction and ID 1 - track (if it exists )direction at the vertex electron  12 2 - vertex - CPS cluster direction photon 10 3 - vertex - cluster position in EM3 photon 10 NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  25. F.Touze, A. Abdesselam,M.J. HMRECO status • (cvs) Package used by emreco to • - build different flavours of H-matrices • - calculate the covariance parameter 2 as a measure of the compatibility of the EMCluster object with an electron shower The choice between 1 and 2 is done by a RCP parameter in emreco  Emreco provides the same cluster preselection • It uses the package hmatrix to store/read H-matrix files NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  26. Available H-matrices in preco04 • Run I H matrix (41 parameters) Energy fractions in floors [EM1, EM2,EM4] Energy fractions in floor EM3 (6x6) channels log(Etot),Zvertex/28. • H matrix (9 parameters) Energy fractions in floors [EPS,EM1, EM2, EM3,EM4] DETA, DRPHI in floor EM3 log(Etot), Zvertex/28. Exists for 2 energy ranges : < > 30 GeV(RCP parameter)  2 2 values attached to each EM candidate NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  27. Latest results with Hmatrices L09 H09 L41 H41 30GeV NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  28. ISNGrenoble (S.Crepé,….. ) Electron Likelihood

  29. E/p electron distributions NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  30. Dhiman Chakraborty Supriya Jain Vishnu Zutshi EM ID using Neural network NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  31. NN vs H-matrix NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  32. Generation of EM fake samples • Principle is to select at the generator level jets which have a high probability to give a e/ fake at the RECO level without biasing the fake samples • Nirmalya Parua(ISNG) : electron fakes ISAJET QCD events with em fraction > 0.65 high PT track > 1 GeV/c within 0.1 in (,) and PTjet / PTtrack < 5 Production at CCIN2P3(Lyon) has started • Alex Menilchouk(Brown) : electron/photon fakes Pythia QCD events with a leading 0 or (or 2 ) and (Etotal(0.4)-EEM(0.2))/EEM(0.2) < 2 ETEM(0.2) > 6. GeV Alex Melnitchouk (Brown) photon fakes NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

  33. Efficiencies : mb1.1av F.Fleuret CC+CC events :PYTHIA 1. < |Detect. h| WITHOUT EDGES 100% 0) MC events 99% (.992) 1) after EM selection 2) after EM sel. & PS matching 97% (.982) 3) after EM sel. & PS match. & TRK match. 84% (.922)

  34. Efficiencies : mb1.1av F.Fleuret EC+EC events : PYTHIA 1.9 < |Detect. h| < 2.5 100% 0) MC events 91%(.952) 1) after EM selection 2) after EM sel. & PS matching 75%(.872) 3) after EM sel. & PS match. & TRK match. 27%(.522)

  35. Conclusions • D0 can trigger on electrons at high PT as well as on di-electrons of low PT • Using calorimeter, PS and tracker electrons will be identified, and measured with high efficiency • Vertical Review Committee recognized that : “The EM ID group has done a lot of very good work so far” • BUT still a lot of work to do ….. !!!!!!!! physics groups should not weaken the effort in the object ID groups NIU D0 Workshop 2000, June 19-23 M.Jaffré Electrons/Photons ……

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