Univ. of Tsukuba & JSPS T. Horaguchi Jan for the ALICE Analysis Workshop. ALICE Analysis Hirosima Univ.

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1 Univ. of Tsukuba & JSPS T. Horaguchi Jan for the ALICE Analysis Workshop 1

2 Tsukuba Group Analysis Tsukuba Tsukuba Tsukuba Cluster Analysis Status & Plan Single & Di-Jet Photon (pi0 & Direct photon via internal conv.) Soft Physics (Mean p T & Accumulative Corr.) Summary & Future Plan 2

3 Contribution to ALICE ALICE Detector Di-Jet Calorimeter Construction Simulation Calibration Physics Analysis TRD DCS Work EMCAL HLT, Calibration ALICE Analysis Direct Photon via Internal Conversion Measurement Single & Di-Jet Measurement Mean p T, Accumulative Correlation Event Display with AliEVE So, we needed more machine power locally, but we succeeded to establish our computing facility! (See next slides) 3

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5 Tsukuba Cluster Established Local Cluster in early April in last year Established private network, gave private IP address instead of global IP Hep-net (See Next Slide) One GateWay in global has the private PCs and Worker Nodes in private IP space for security reason Plan for Data Transfer Several hundreds GByte will be transferred with starting LHC-ALICE How many times we have a meeting with abroad in months? About 5 or 6 times Security for our Network All private PCs and Worker Nodes are in private, except GateWay Restricted password access to Gateway, adopted public key access for security reason Only the access from major Institutes and member s home are permitted access to GataWay using ssh VPN will be adopted our network near the future 5

6 Local Disk Local Disk Private Network PC PC PC Hep-net GateWay Local Cluster WN Condor Server Disk Server Private Network Local Cluster(16 nodes) Private PC(~15nodes) Local Cluster PHENIX / ALICE CPU (144core) Xeon E GHz 7node x 2cpu x 4core Memory / core ~ 1GByte Xeon E GHz 7node x 2cpu x 4core Memory / core ~ 1GByte Xeon E GHz 2node x 2cpu x 8core Memory / core ~ 1.5GByte Storage Server RAID :12TByte Local : ~8TByte Total : ~ 20TByte OS Scientific Linux 4.5 & 5.3 All WN will be updated to SLC5 Batch Job System Condor 6

7 ALICE Data Analysis AliRoot Installation V4-16-Rev-03 V V4-17-Rev-20 (for pass1) V4-17-Rev-22 (for pass1) V4-17-Rev-23 (for pass2 only Calorimeter) V4-17-Rev-24 (for pass2) ALICE Data First Year pass1 data (all root_archive) First Year pass2 data (Calorimeter only) First Year pass2 data (ESD only) Physics Simulation & Analysis Simulation for Di-Jet Calorimeter in event generator level PYTHIA PQUEAN QPYTIHA (1sec / event) HIJING Simulation for Di-Jet Calorimeter in GEANT level Waiting for Wuhan s contribution Data Transfer with AliEn 0.2 MByte / sec with gridftp 7

8 1 Staff & 5 Students are working Staff T. Horaguchi Student K. Watanabe D. Sakata M. Sano H. Yokoyama Y. Watanabe 5 students are expert & super heavy user of our cluster! 8

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10 Member Y. Miake S. Esumi T. Chujo M. Inaba M. Shimomura T. Horaguchi M. Sano D. Sakata H. Yokoyama S. Kubota Y. Kondo Y. Watanabe 10

11 γ in PHOS/J-cal Recoil Di-jet E T jet1 >70GeV π0 in PHOS/J-cal EM-cal EM-cal Recoil γ-jet E T γ >30GeV Recoil π 0 -jet E T π0 >30GeV jet (R<0.3) in J-cal EM-cal ALICE Analysis Hirosima Univ. M. Sano, H. Yokoyama, Grad. Student of Tsukuba 2010/1/21 11

12 Improvement in jet energy resolution! M. Sano, H. Yokoyama, Grad. Student of Tsukuba ALICE Analysis Hirosima Univ. 2010/1/21 12

13 Member T. Horaguchi D. Sakata Joined Jet Working Group in PWG4 Presentation 2 PWG4 Using Tsukuba Cluster Focused to study Jet Finding Algorithm now, but we also has started the analysis of pp 900GeV data! 13

14 FastJet: sequential clustering algorithms d ij = min(k ti 2 p,k tj 2 p ) R2 R 2 Algorithm p =1 p = 0 p = 1 Calculate particle distance : d ij Calculate Beam distance : d ib =k ti 2p Find the smallest distance (d ij or d ib ) If d ij is the smallest combine particles If d ib is the smallest and the cluster momentum lager than threshold call the cluster a Jet. k T algorithm Cambridge/Aachen algorithm anti-k T algorithm K T jet Cone jet Parameters - R size - p T cut - Jet threshold arxiv: v2 [hep-pn] (2008) ALICE Analysis Hirosima Univ. 2010/1/21 14

15 We analyze for closest Jet to parton Δφ, Δη= parton axis jet axis This work has been done by D. Sakata & T. Horaguchi. Δϕ resolution Δη resolution p T hard 100GeV/c Jet threshold 20GeV/c measured energy Resolution : σ of sharp gaussian k T algorithm anti-k T algorithm Cambridge algorithm Performance of energy reconstruction of Jet with anti-k T algorithm is about 50% better than k T algorithm! ALICE Analysis Hirosima Univ. 2010/1/21 15

16 Member K. Watanabe T. Horaguchi Presentation PWG2(2010 Jan. 12) Physics Motivation Study of soft & hard physics in pp collisions Mean pt Accumulative Correlation Using Tsukuba Cluster, but just preparing to join the PWG2 Train now. PWG2 s suggested to us, we had better to join First Physics group for study of mean pt & Multiplicity 16

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20 Direct Photon via Internal Conversion T. Horaguchi K. Watanabe Using Hiroshima Cluster & GSI cluster & Tsukuba Cluster Several presentations in PWG4 Preparation to join PWG4 mini train is ongoing Pi0 Analysis with EMCAL T. Horaguchi M. Sano This analysis has just started now! Photon analysis is also important for Di-Jet Calorimeter analysis. Joined calorimeter analysis group. 20

21 Established Tsukuba Cluster For Di-Jet Calorimeter A lot of Simulation works done, and will continue We are very welcome to use Tsukuba Cluster by D-Cal collaborator. Please notify us if you want! For Local Data Analysis Started First Data Tsukuba Several analysis has just started in parallel! Almost analysis is Tsukuba Cluster Preparation to join the PWG s Train is ongoing In this time, we do not use CAF However, we will move to using GRID analysis to analyze high luminosity data in 7TeV pp and 10TeV pp run as soon as possible! 21

22 EMCal module Extension of ALICE-EMCal; same design, same material, same electronics. Lead-Scintillator sandwich type sampling EMCal (77 layers), APD readout with WLS. ( Φ, η) ~ (0.025,0.025) ALICE Analysis Hirosima Univ. 2010/1/

23 Jet (small R) trigger π 0 (hadron) trigger more and more surface bias given by energy loss γ,jet,π 0 - hadron correlation Comparisons are the most important! RHIC-AGS 09, Y. S. Lai STAR Preliminary Au+Au 0~10% QM09, M. Ploskon 2010/1/21 23 Closer and closer to the initial parton energy Gamma trigger Jet (large R) trigger ALICE Analysis Hirosima Univ.

24 ALICE EMCAL eta view of ALICE & J-CAL J-Cal In φ, on opposite side of EMCAL In η, next to the PHOS 6 SMs in total. ALICE Analysis Hirosima Univ. 2010/1/

25 JCal 6 super modules η~ PHOS 5 modules shown B6 Configuration was chosen to have a largest possible jet radii in J-Cal ALICE Analysis Hirosima Univ. 2010/1/21 25