Belle Data Analysis using GRID Youngjoon Kwon Yonsei

Belle Data Analysis using GRID Youngjoon Kwon (Yonsei Univ. ) & Hyoungwoo Park (KISTI) I give thanks to Jung-hyun Kim & Sun-min Kim for the actual hard work.

KEK Belle 실험 소개 CP Violation & electroweak interaction of elementary particles n Testing CKM mechanism of CP violation n n KEK Accelerator n n n Circumfirence ~ 3 km Asymmetric e+e- collision Clean environment of B meson production 전자-양전자 충돌

BELLE detector SVD : vertex point n CDC momentum and d. E/dx of n BELLE detector charged particle n ACC : Kaon and pion separation n TOF : Kaon and pion separation ECL : energy measurement n KLM : measurement the n direction of K(long) and to identify muon

Why Belle needs GRID? n 2004년 6/1 현재 260/fb n n (1/fb = 약 100만 이벤트 = 100 GB) 분석시간 (P 4 2 GHz) n n 1만 이벤트당 2분 소요시 260/fb = 36. 5일 소요

Kor. BELLE PC cluster V 2. 0 QQ (Evt. Gen) GEANT (Det. Sim) Skim QQConfig RUNConfig QQProcess RUNProcess Belle-lib server (BASF) Node 01 Analysis Batch Job System Node 02 Node 03 KNU Data Storage (Real/MC data) Node 04

SE structure plan 1) SE : dividing virtual users and Central Data SE 2) virtual users SE always is not mounted NFS or AFS UI RB 3) Central Data SE is always CE mounted NFS or AFS virtual users SE 4) Grid-ftp transfers the data between SE and UI Node 01 Central Data SE Node 02 Node 03 Node 04 Node. N

SC 2003 글로버스 툴킷 2. 4 사용 n Belle-lib(BASF) 설치. n Gsim 이벤트 디스플레이 성공. n CA (Certification Authority) n n 인증서 방식의 접속. users job Job Distribution System Belle-lib(BASF) server Batch Job System NODES Globus Toolkit

UI (User Interface)

KISTI 장비 소개 Rpeak 435. 2 Gflops Memory 1 GB/node Node 128(P 4 -1. 7) Disk 20 GB/node, share 1 TB Connection Myrinet 2000

J/ψ reconstruction n 전자, 양전자 n n n eid e. prob(3, -1, 3) > 0. 01 : electron identification E over P(E/p) > 0. 5 : 에너지/운동량 d. E/dx > 0. 5 : 단위길이당 에너지 광자보정 : bremsstrahlung 광자(photon) 보정 Muon+, Muonn n Muid > 0. 1 : Muon identification 0. 1 < Ecl < 0. 3 : Cs. I Calorimeter 에서의 하전입자의 위치에너 지

J/ψ <BELLE> <KISTI>

Korean Belle Grid Performance * Belle-Cluster 1. 0 Result Test: MC( 101000 # of events) Belle Lib: b 20020424_1007 B->J/Psi + Ks decay J/Psi mass distribution 1. The cluster’s run time speed is N times faster than single Linux Machine. 2. We trust the System for Belle analysis