CMS Status Report 8 th CERN-Korea Committee Meeting CERN October Guido Tonelli University of Pisa/INFN/CERN Our physics goals. The CMS Experiment Where we are today

Korea and CERN / May Entering a New Era in Fundamental Science The Large Hadron Collider (LHC), one of the largest and truly global scientific projects ever, is the most exciting turning point in particle physics. Exploration of a new energy frontier proton-proton collisions at E CM = 7-14 TeV Exploration of a new energy frontier proton-proton collisions at E CM = 7-14 TeV LHC ring: 27 km circumference CMS ALICE LHCb ATLAS

Why everything is so complex? We are trying to solve some of the main puzzles of nature What is the origin of mass What is the dark matter that keeps together the clusters of galaxies Why the main interactions are so different in strenght Why gravity is not included so far in our picture How many are really the dimensions of our world The answer to some of these questions is probably hidden in the so far unexplored TeV region 3

Korea and CERN / May Hubble ALMA VLT WMAP Atom Proton Big Bang Radius of Earth Radius of Galaxies Earth to Sun Universe cm Study physics laws of first moments after Big Bang Particle Physics connection to Astrophysics and Cosmology Super-Microscope LHC

MUON BARREL CALORIMETERS Silicon Microstrips Pixels ECAL Scintillating PbWO 4 Crystals Cathode Strip Chambers (CSC) Resistive Plate Chambers (RPC) Drift Tube Chambers (DT) Resistive Plate Chambers (RPC) SUPERCONDUCTING COIL IRON YOKE TRACKERs MUON ENDCAPS Total weight : 14,000 t Overall diameter : 15 m Overall length : 28.7 m Magnetic field : 3.8 Tesla HCAL Plastic scintillator copper sandwich The Compact Muon Solenoid (CMS) 5

The CMS Collaboration >2500 scientists 182 universities and research centers. 39 countries and regions of all continents. 6 KOREA in CMS 6 Institutes: Chonnam University, Kangwon University, Korea University, Kyungbuk University, Sungkyunkwan University, University of Seoul Total : 50 Participants 22 PhDs (including 12 Prof.) 28 Graduate Students. Important contribution to the CMS construction, operation and physics CERN France Italy UK Switzerland USA Austria Finland Greece Hungary Belgium Poland Portugal Spain Pakistan Georgia Armenia Ukraine Uzbekistan Cyprus Croatia China, PR Turkey Belarus Estonia India Germany Russia Bulgaria China (Taiwan) Iran Serbia New-Zealand Brazil Ireland Mexico Colombia Lithuania Korea

Korea in CMS Korea involvement in CMS dates back to Important contribution to the Construction of the Detector Now important contribution to the Operation and Data Taking activities, GRID Computing (Tier2) and Physics Analysis. 7 The swiveling platform: 220 ton object rotated in 15 mn Hundreds of sophisticated Muon RPCs, constructed, installed, commissioned Produced in Dong Yang

A concentrate of the most modern technologies. 8

December 2009: high energy collisions in LHC 9

10 Where we are now. About 15pb -1 delivered by LHC and ~13.8pb -1 of data collected by CMS. Overall data taking efficiency ~92%. ICHEP L ≈ 8.5x10 31 cm -2 s -1 L ≈ cm -2 s -1 Average fraction of good channels per CMS sub-system >99%.

11 First physics results. e/  +jets L=0.84pb -1 W Z top L=2.9pb -1 Q* and new resonancesCompositness New phenomena

12 Upgrade project. Financial plan for the CMS upgrade will be presented at the next RRB. We expect commitments in the April RRB. I expect Korea will play an important role in the upgrade of CMS. First LHC Shutdown HF/HO phototubes replacement. YE4 shielding wall. Forward Muons Upscope: 4-th muon endcap station: CSC + RPC Second LHC Shutdown New 4 layer Pixel Detector HB/HE new photo-transducers

Conclusion We have just started the systematic exploration of the TeV region with an excellent scientific instrument. My hope is that there will be many un-expected results and our current understanding of nature will change in depth thereafter. I am fully confident that korean physicists will continue to provide CMS outstanding contributions to the operation of the detector and to the physics analysis of the data. In this respect new groups and additional investments in local computing infrastructures (Tier2) would be welcome. I hope Korea will be able to contribute significantly to the Upgrade project of CMS. 13