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PDC04 Data Analysis Prashant Shukla Highlights

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jarrod-morrow
20 diapositives · 299 Views · Nov 28, 2014

This presentation delves into the analysis of TRD signal events, background events, and event parameterizations in ALICE at CERN. The study aims to test simulations, reconstruction, and develop analysis programs for various quarkonia and open charm/bottom states using Aliroot with different versions. Results include track transport, event generation, and PID efficiency assessments.

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  1. First Experience with the PDC04 Data Analysis Prashant Shukla Institute of Physics University of Heidelberg Presentation at ALICE Offline Week 13th -17th Sept. 04 at CERN

  2. Studies at Heidelberg: Generating and testing few TRD signal and background events With the aim 1. To test the simulation and reconstruction 2. To develop the analysis programs for quarkonia and open charms and bottoms and their invariant mass spectra. Aliroot has seen many versions in last few months: V4-02-Rev-02 V4-02-04 V4-02-05 V4-02-06 ( Released Last week) All with Root v3-10-02 and Geant3 v0-6

  3. PDC04 : TRD Signal event: 10 ( J/y, y’) e- + e+ 10 ( Y, Y’, Y”)  e- + e+ 10 ( Ds and Dbars)  e- + e+ 10 ( Bs and Bbars)  e- + e+ 10 ( Bs and Bbars)  J/y  e- + e+ These are the parameterizations of Ramona Vogt results Given in AliGenMUONlib Underlying Events: Hijingcent1  b (0, 5) Hijingper1  b (5, 8.6) Hijingper2  b (8.6, 11.2) Hijingper3  b (11.2, 13.2) Hijingper4  b (13.2, 15) Hijingper5  b (15 and above)

  4. GTREVE_ROOT : Transporting primary track No 38980 GTREVE_ROOT : Transporting primary track No 38970 *** GTRACK *** More than 30000 steps, tracking abandoned! =====> TRACK 1 STACK NR 0 NTMULT= 54289427 DEUTERON TOFG = 39.206 NS X Y Z R NAME NUMBER SLENG STEP DESTEP GEKIN MECHANISMS -188.7399 -55.2230 -24.6591 196.6528 TPUS 28 209.2515 0.0045 285.7 eV 21.228 MeV FIEL LOSS MULS SMAX STOP IEVENT 1 IDEVT 1 Random Seeds 0 0 Time of flight 39.206 ns GTREVE_ROOT : Transporting primary track No 38940 Error in <Loc2Sec>: Position 117.16, -1.04 is out of chamber in Y **** GTCKOV: unable to reflect at NTMULT = 54320430 step No. 4 photon abandoned! **** GTCKOV: unable to reflect at *** Break *** floating point exception Generating stack trace... /usr/bin/addr2line: aliroot: No such file or directory /usr/bin/addr2line: aliroot: No such file or directory 0x4f873779 in TBranchElement::FillLeaves(TBuffer&) + 0x2ff from /home09/aliroot/root/v3-10-02/lib/libTree.so Simulation Backgr cent1 events With Aliroot v4-02-05

  5. Input J/y Distribution:

  6. Input Y Distribution: Blue in TDR of TRD Red in PDC04

  7. Physics Data Challenge The Version of Aliroot v4-02-05 20 events with per5 and signals embedded in them Total number of events analyzed: 20 Gen QK: 400 Gen AccQK: 143Rec QK: 133 Rec TpcQK: 48 Rec TpcTrdQK: 13 Gen CCbar (Uncorr.) : 441 Gen AccCCbar (Uncorr.): 112 Rec Ccbar: 73 Gen bbbar (Uncorr.) :425 Gen Accbbbar (Uncorr.): 147Rec bbbar: 81 Total Gen El: 6021Recon. Ele: 663 Gen tracks: 6021Recon. tracks: 663

  8. Physics Data Challenge The Version of Aliroot v4-02-06 10 events with per5 and signals embedded in them Total number of events analyzed: 10 Gen QK: 300 Gen AccQK: 110Rec QK: 110 Rec TpcQK: 110 Rec TpcTrdQK: 70 Gen CCbar (Uncorr.) : 240 Gen AccCCbar (Uncorr.): 90 Rec Ccbar: 10 Gen bbbar (Uncorr.) :240 Gen Accbbbar (Uncorr.): 120Rec bbbar: 60 Total Gen El: 4210Recon. Ele: 430 Gen tracks: 4210Recon. tracks: 430

  9. HIJING cent1 event generated at CERN with Aliroot v4-02-04. The ESD from one event checked with CheckESD.C macro. 5070 out of 7116 tracks reconstructed including 583 fake tracks eff = (71.2 +- 0.5) % fake = (8.2 +- 0.3) % Relative inverse pt resolution = (0.8 +- 0.0) % Phi resolution = (0.7 +- 0.0) mrad Theta resolution = (1.6 +- 0.0) mrad PID eff = (96.5 +- 0.3) % gen\rec: electron muon pion kaon proton electron: 14 0 15 3 0 muon: 0 0 0 0 0 pion: 6 0 4388 45 7 kaon: 2 0 72 280 2 proton: 1 0 19 3 213 other: 0 0 0 0 0 TOF resolution = (94.2 +- 2.4) ps V0 eff = (2.7 +- 0.8) % Cascade eff = (0.0 +- 0.8) %

  10. TRD PID eff = (87.7 +- 0.5) % gen\rec: electron muon pion kaon proton electron: 0 0 32 0 0 muon: 0 0 0 0 0 pion: 0 0 4446 0 0 kaon: 0 0 356 0 0 proton: 0 0 236 0 0 other: 0 0 0 0 0ITS PID eff = (93.6 +- 0.3) % gen\rec: electron muon pion kaon proton electron: 0 0 31 1 0 muon: 0 0 0 0 0 pion: 11 0 4331 91 13 kaon: 0 0 127 221 8 proton: 1 0 37 3 195 other: 0 0 0 0 0

  11. TPC PID eff = (94.3 +- 0.3) % gen\rec: electron muon pion kaon proton electron: 13 0 12 5 2 muon: 0 0 0 0 0 pion: 1 0 4441 4 0 kaon: 0 0 195 161 0 proton: 1 0 65 5 165 other: 0 0 0 0 0TOF PID eff = (89.7 +- 0.4) % gen\rec: electron muon pion kaon proton electron: 0 0 32 0 0 muon: 0 0 0 0 0 pion: 21 0 4407 10 8 kaon: 1 0 283 71 1 proton: 0 0 164 1 71 other: 0 0 0 0 0

  12. HIJING cent1 event generated with Aliroot v4-02-06. The ESD from one event checked with CheckESD.C macro. 6751 out of 9606 tracks reconstructed including 629 fake tracks eff = (70.3 +- 0.5) % fake = (6.5 +- 0.3) % relative inverse pt resolution = (0.7 +- 0.0) % phi resolution = (0.7 +- 0.0) mrad theta resolution = (1.6 +- 0.0) mrad PID eff = (92.4 +- 0.3) % gen\rec: electron muon pion kaon proton electron: 24 0 5 1 0 muon: 0 0 0 0 0 Pion: 33 0 5616 184 47 kaon: 7 0 162 316 16 proton: 7 0 47 3 283 other: 0 0 0 0 0 V0 eff = (4.0 +- 0.9) % Cascade eff = (0.0 +- 0.9) % check of ESD was successfull

  13. ONLY TRD PID gen\rec: electron muon pion kaon proton electron: 0 0 27 3 0 muon: 0 0 0 0 0 pion: 21 0 5350 268 241 kaon: 8 0 368 59 66 proton: 15 0 196 8 121 other: 0 0 0 0 0

  14. Summary: 1. Simulation and reconstruction of both central and peri. Events with Aliroot v4-02-06 looks smooth now. 2. With earlier versions, TPC signal was zero for many reconstructed electrons. In v4-02-06 this bug is not there. 3. Parameterized distributions have been used for open charm and Bottom productions. Studies with correlated charms and bottom not possible. 4. There is no straight method for getting vertex associated with each ESD tracks. 5. Particle identification for TRD is to be implemented.