Evaluation of ALICE electromagnetic calorimeter jet event trigger performance for LHC-Run2 by simulation
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1 Evaluation of ALICE electromagnetic calorimeter jet event trigger performance for LHC-Run2 by simulation Pure and Applied Sciences University of Tsukuba Ritsuya Hosokawa,Tatsuya Chujo,Hiroki Yokoyama for the ALICE collaboration 1
2 Outline Detector and L1 Jet algorithm over view - LHC Run2 and ALICE - ALICE electromagnetic calorimeter - Trigger inputs - L1 Jet trigger patch(emcalside and DCAL/PHOS side) - L1 Jet processing flow p-p trigger performance estimation and Event by event background estimation for Pb-Pb run - Data set - L1 Jet rejection for p-p event - L1 Jet efficiency for p-p event - Background estimation for Pb-Pb event Summary 2
3 year LHC Run2 and ALICE LHC The most largest collider in the world that is operated by CERN Run Long Shutdown 1(LS1) For upgrade and tuning of accelerator and detectors Run s NN = 13~14 TeV (p-p), 5.5TeV (Pb-Pb) ALICE detector ~2018 LHC-ALICE The experiment for heavy ion collision Reveals the property of QuarkGluon Plasma(QGP) Expansion of detectors(ls1) (DCAL/PHOS, EMCAL, TRD, TPC-RCU2 upgrade...) 3
4 ALICE electromagnetic calorimeter(s) EMCAL (acceptance) Δφ 107 A-side Δη 1.4 DCAL + PHOS acceptance Δφ 67 Δη 1.4 PHOS acceptance Δφ 100 C-side EMCAL (ElectroMagnetic CALorimeter) Sampling type calorimeter which consists of Pb and scintillators Δη 0.24 PHOS (PHOton Spectrometer) Jet Homogeneous calorimeter which consists of PbWO4 New!(Run2~) DCAL (Di-Jet CALorimeter) Electromagnetic calorimeter which has same structure as EMCAL Mainly, measures Di-Jet event and γ-jet event as a probe of QGP property + ~7 deg 4
5 Trigger inputs Minimum component of L0/L1 Trigger processing (FastOR) - from 1 Module signal (EMCAL/DCAL) - from 2x2 Crystals signal (PHOS) 5
6 L1 Jet trigger patch (EMCAL side) 4x4 FastOR (8x8 Towers) Subregion n x n Subregions (n = 2,3,4) (n=4 was used at Run1) Jet patch When the Jet patch amplitude exceeds threshold, L1 is fired 6
7 L1 Jet trigger patch (DCAL/PHOS side) In DCAL region, Subregion is defined as same as EMCAL In PHOS region, 4 different Subregion size is used Because of cell size difference between DCAL and PHOS There are about 34 cm spacial gaps on eta direction between DCAL and PHOS This may make trigger performance worse 7
8 L1 Jet processing flow From Run2 heavy ion Run, new online background subtraction method will be used Run1: event by event threshold calculation by using V0 multiplicity Run2: event by event background subtraction by using background energy that is estimated by opposite side calorimeter 8
9 Data set LHC 15b1 (Pythia 13 TeV Min bias with Run2 geometry) For estimate rejection Pythia 13TeV p-p event with Jet event For estimate trigger efficiency generated myself Hijing 5.5TeV Pb-Pb event For estimate background 9
10 L1 Jet rejection for p-p event Jet patch size 4x4 Subregions (32x32 Towers) ~1/1000 Threshold = 10GeV 10
11 L1 Jet efficiency for p-p event efficiency = Number of Triggered Jets Number of reconstructed particle level (MC ) Jets inside EMCAL / DCAL acceptance( anti kt, R=0.2) Jet patch size 4x4 Subregion (32x32 Tower) > > 50 GeV/c (EMCAL) >70 GeV/c (EMCAL) >90 GeV/c (DCAL) Threshold 10 GeV 11
12 Background estimation for Pb-Pb event These were estimated by using only particle level(mc) track (no detector effect) jet ρ jet =median( p T / Area jet ) Emedian background energy in BKG patch BKG estimated by calorimeter Both of V0 multiplicity and background energy which is estimated by calorimeter have good relation to Jet rho Quantitative assessment In progress 12
13 Summary I estimated... - L1 Jet rejection for p-p For example,about 1/1000 threshold 10GeV - L1 Jet efficiency for p-p Threshold 10GeV... > > 50 GeV/c (EMCAL) >70 GeV/c (EMCAL) >90 GeV/c (DCAL) - Jet background for Pb-Pb In future - Quantitative assessment of background estimate accuracy of each method (V0 using method or Calorimeters using method) - estimate rejection and efficiency for Pb-Pb including detector effect - estimate purity 13
14 Backup 14
15 EMCAL L1 trigger status, Hiroki Yokoyama (Trigger meeting Tuesday, 17 February 2015) 15
16 Pythia data pthardbin_loweredges=( ) pthardbin_higheredges=( ) events generated per each pthardbin Hijing data 0-10% Central 10-50% Central % Central 3000 events generated per each centrality class I took configuration from LHC15b1 16
17 Inclusive Jet Yields Dijet production in 2015 Flat scenario MB/RARE = 4 w/ 7 w = 10nb-1 (0.6G) / 5pb-1 POWHEG-V2 + CTEQ6M NLO + PS (AliRoot) Total dijet xsec 7.45mb Anti-kT R=0.3 estimated by Rachid Guernane RARE (bullets) full space calo EMCal DCal+PH OS (No gap) MB (full lines) 17
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