Polish Contribution to the Worldwide LHC Computing Grid WLCG M. Witek On behalf of the team of Polish distributed Tier-2 Outline Introduction History and status of Polish Tier-2 Federation Examples of physics results from LHC experiments CERN - European Organisation for Nuclear Reseach LHC – Large Hadron Collider CMS Alice LHCb Atlas

Polish WLCG Tier-2 team – A. Binczewski 3, M. Bluj 5, A. Cyz 2, M. Dwużnik 1, M. Filocha 4, L. Flis 1, R. Gokieli 4,5, J.Iwaszkiewicz 4, M. Kowalski 2, P. Lasoń 1, R. Lichwała 3, M. Łopuszyński 4, M. Magryś 1, P. Malecki 2, N. Meyer 3, K. Nawrocki 4,5, A. Olszewski 2, A. Oziębło 1, A. Padee 4,5, H. Pałka 2, M. Pospieszny 3, M.Radecki 1, R. Rowicki 4, D. Stojda 6,4, M. Stolarek 4, T. Szepieniec 1, T. Szymocha 1,2, M.Turała 1,2, K.Wawrzyniak 4,5, W.Wiślicki 4,5, M.Witek 2, P.Wolniewicz 3 Institutions – 1 AGH University of Science and technology, ACC Cyfronet AGH, Krakow – 2 Institute of Nuclear Physics PAN, IFJ PAN, Krakow – 3 Poznan Supercomputing and Networking Center, PSNC, Poznan – 4 Interdisciplinary Centre for Mathematical and Computational Modelling, ICM, Warsaw – 5 Soltan Institute for Nuclear Studies, IPJ, Warsaw – 6 Copernicus Science Centre, CSC, Warsaw, Poland More details will be available in the article of PL-Grid Book 2

Eksperiment requirements Example of on-line conditions – ~10 8 electronic channels to read at 40 MHz – 1 PB/sec of raw info from the detector – ~few TB/sec of zero suppressed data ( channels with signal only) Multi-level trigger system – Reduction factor – Output rate > 100 MB/sec 10 7 sec/year ~few PB of raw data per experiment Level 1 Level 2 40 MHz (1000 TB/sec) Level 3 75 KHz (75 GB/sec) 5 KHz (5 GB/sec) 100 Hz (100 MB/sec) Data Recording & Offline Analysis WLCG 3

(Pre)History MONARC (Models of Networked Analysis at Regional Centres for LHC Experiments) – Simulate data processing (a kind of Monte Carlo model): a complex set of networked computing systems (CERN, Tier-1 and Tier-2 regional centres) the analysis process, composed of a dynamic workload of reconstruction and analysis the behaviour of key elements of the system, such as distributed database servers and the networks Summary: CERN-LCB One of the 2000: data sharing difficult due to the prohibitively high cost of networking 4 Even more pronounced in Poland at that time !!!

From 2000 to : DataGrid 2000 – HEP oriented EU project 2000:CERN-Poland meeting (initiated by M. Turala & P. Malecki) 2002: CrossGrid first Polish EU project with HEP task. 2002: start of LCG (LHC Computing Grid) 2003:First LCG testbed of 14 sites (Cyfronet participation) : EGEE, EGEE II, EGEE III : Participation in Data Challenges : BalticGrid, BalticGrid II 2007: Poland signs MoU for WLCG 2009: start of PL-Grid project (WLCG infrastructure) : LHC start. Smooth running of Polish WLCG sites. 5

Polish participation in networking and grid projects Polish part of WLCG emerged out of many different projects. Some of them not directly related to HEP. Nevertheless they provided infrastructure and common tools. 6 PIONIER, CrossGrid, EGEE and PL-Grid were essential for the development of Polish WLCG infrastructure.

7 GTS 1,6 Gb/s GDAŃSK POZNAŃ ZIELONA GÓRA KATOWICE KRAKÓW LUBLIN WARSZAWA BYDGOSZCZ TORUŃ CZĘSTOCHOWA BIAŁYSTOK OLSZTYN RZESZÓW Bielsko-Biała GÉANT Gb/s KOSZALIN SZCZECIN WROCŁAW ŁÓDŹ KIELCE PUŁAWY OPOLE RADOM BASNET 34 Mb/s CESNET, SANET GÉANT / TELIA 2x2,5 Gb/s DFN 10 Gb/s Gorzów MAN 10 Gb/s (1 lambda) 2 x 10 Gb/s 1 Gb/s CBDF 10 Gb/s PIONIER’S FIBERS Polish infrastructure in WLCG Tier1 FZK Karlsruhe Tier2 PCSS Poznań Tier2 ICM Warszawa Tier2 ACK Cyfronet Kraków HEP VLAN 1 Gb/s HEP VLAN 1 Gb/s

Pionier – Polish Optical Internet Nationwide broadband optical network represents a base for research and development – Europe's first national academic network that uses its own dark fiber optics and DWDM 10GE transmission – Connects 21 Academic Network Centers of Metropolitan Area Networks (MAN) and 5 of the HPC (High Performance Computing) centers. Cross-border links with: Germany (DFN), Czech Republic (CESNET), Slovakia (SANET), Ukraine (UARNET), Byelorus, Lithuania Started in 2000, 5917,5 km of fibres 2010 Data sharing problem due to networking limits indicated by MONARC solved ! 8

Towards physics results - that is what WLCG was built for Every experiment (ALICE, ATLAS, CMS, LHCb) has its own computing model. All based on multi-tier structure Successful LHC restart in 2009 Excellent performance of the LHC and the experiments 3.5*10 14 collisions delivered in 2011 Polish distributed Tier-2 Kraków-Poznań-Warszawa The RAW data reside in Tier-0 and Tier-1. The final physics result is an effect of many processing steps. Some steps have to be repeated when better detector calibration and alignment appear. The role of Tier-2 sites: Monte Carlo production Analysis centre (larger sites) Limited reprocessing activity 9

LHCb computing model – DIRAC role 10

Polish WLCG resources ACK Cyfronet AGH – Tier2 Polish sites provide about 2% of the total computing power in proportion to the engagement of Polish scientists in the LHC experiments. Most of the resources comes from PL-Grid infrastructure Polish Tier-2 Federation CPU (HS06) Disk (TB) Tier-3 at IFJ PAN WLCG pledges 11 Relia bility Availa bility Atlas LHCb Warsaw ICM – Tier2 CMS LHCb Poznan PSNC – Tier2 Alice Atlas July 2011

Poland in LCG accounting A week with 9 % contribution of Cyfronet to the LHCb reprocessing of 2011 data. Congratulations for the site performance from the LHCb computing team. LHCb 3.9% delivered by Poland CMS 2% delivered by Poland Month 2011 MayJuneJulyAugSept Usage as % of pledge 165%266%299%173%229% Performance of Polish Tier-2 (From WLCG Accounting) Increase over 100% mainly due to Cyfronet additional resources Highlight from LHCb 12 Atlas 1.6 % Delivered by Poland Tier-1/2 At present 69 Tier-2 federations in 33 countries. The size of Polish Tier-2 is in top 20.

The Standard Model – Particles and Forces 13 Bulding blocks of our Universe

ATLAS and CMS – direct discovery potential Find the last undiscovered element of the Standard Model – The Higgs bozon Direct discovery of New Physics – Supersymmetric particles or any object/phenomena beyond Standard Model we even did not think about yet ATLAS CMS The Higgs boson search 14

LHCb – LHC beauty experiment Hunting the signs of new physics by precision measurements Bs0→μ+μ-Bs0→μ+μ- B s 0 (bs) meson contains two quarks which are not present in the world around us: b beauty and s strange Extremely rare decay 3 out of 10 9 decays Standard ModelSupersymmery New Physics 2 decays observed – 1.4 expected No sign of New Physics yet 2 events selected out of recorded WLCG 2 events selected out of 3.5*10 14 initial collisions New phenomena can significantly increase the decay rate 15

Summary Polish physicists and computer scientists created distributed WLCG Tier2, which availability and efficiency is high; the delivered resources are in the range 2-3 % of the total. The performance of the WLCG matches high requirements of the data processing of LHC experiments. Lots of highest quality physics results are being shown recently. Much more are on the way, hopefully showing New Physics. 16 Acknowledgments We would like to thank all people for their contribution to the successful creation and operation of Polish Tier-2 Federation. In particular the management and staff of the three computing centres, ACC Cyfronet AGH in Krakow, ICM UW in Warsaw and PSNC in Poznan for their constructive cooperation. A supportive approach of the directorates of IFJ PAN Krakow and IPJ Warsaw is also appreciated. We are also grateful to many people from CERN, the FZK Karlsruhe and other WLCG collaborating institutions for their friendly advice and support.