CMS Goal of the experiment To explore the physics of p-p collisions at 14 TeV center-of-mass-energy of LHC. The main goal of CMS will be the search and study of the Higgs boson and of the super-symmetric partners of the known particles. The scientific program includes also detailed studies of the top quark and precision measurements of CP violation parameters in the b-system. The physics of heavy ion collisions to identify the signature and study the properties of quark-gluon plasma will also be addressed. Physics achievements in 2001 The experiment is still in construction, therefore no physics result has been achieved in 2001. Important results have been obtained from the R&D activity carried on for all the sub-systems of the experiment, including computing. INFN contribution to the experiment in terms of manpower and financial support INFN researchers are involved in the following sub-detectors: Solenoidal Magnet, Tracker, Electromagnetic Calorimeter, Muon System and Computing. The total number of physicists and engineers working in CMS in 2001 is 221. They come from 12 INFN Laboratories and account for about 15% of the total number of CMS collaborators. Technicians are not included in these figures. The INFN financial support for CMS deliverables amounts to about 55 MCHF over an estimated total cost of the experiment around 466 MCHF. Funding foreseen in the 2002 Budget: 8141 kEuro

Number of publications in refereed journals ~ 30 Number of talks to conferences (from INFN) ~ 20 Number of undergraduate and doctoral thesis on the experiment 17 undergraduate students and 6 doctoral thesis Leadership role in the experiment - Lorenzo Foa‘ : Chairman of the Collaboration Board - Fabrizio Gasparini: Project Leader (Muon) - Rino Castaldi: Deputy Project Leader (Tracker) - Cristiana Peroni: Finance Board - Guido Tonelli: Management Board and Finance Board Innovative instruments 4T magnet; large area RPC’s; radiation-hard silicon detectors and read-out electronics; analog optical links; new crystals and APDs; new approach on trigger, data handling and computing. Competing experiments ATLAS for the entire physics program. CDF and LHC-B for part of the program; Alice for Heavy Ions physics. International committees which have reviewed the experiment The most important one is the LHC Committe at CERN.

Milestones 2001 MAGNET Winding of the prototype July Completion of CB-2 module December RPC Production of front-end chips July Production of front-end boards September Production of 70% of stations of the 1st wheel December ECAL Construction of the 1st module in INFN/ENEA RC December Production and test of module 0 December MUONS DT Completion of production lines in LNL March 5 DT chambers produced June Completion of the tender for trigger ASICs (BTI, BTIM) October 15 DT chambers produced December TRACKER Construction and test of a pre-series of 200 modules June Start of series production of detectors and mechanical structures December

Milestones 2002 MUONS 8 MB3 May Further 8 MB3 October Production lines in Torino ready September Assembly test of the first mini-crate October RPC Decision on mass production January Production and test of the front end chips February Production stations 2 and 3 CW June HV system prototype ready July Production and test of all FE boards September Production station 1 CW October ECAL Quality check on 2000 crystals June* • Quality check on 6000 crystals (20% of the total) December* Assembly and test of 5 modules June* Assembly and test of 12 modules (15% of the total) December* • Test of 12 HV boards June • Test of 36 HV boards (25% of the total) December Production of 26 grids June • Production of 52 grids (36% of the total) *These items are subject to the delivery in time of parts (like crystals or photo-detectors) supposed to be delivered by other Institutions.

Milestones 2002 TRACKER 40 modules M200 produced January System test (6 modules in a string) March Final specifications optical hybrid May Start-up of module production June Final specifications Power Supply October 400 modules produced December Layer 1 mechanical structure December MAGNET Impregnated prototype ready January Module CB-2 impregnated April Module CB-1 impregnated July Module CB0 impregnated October COMPUTING All sites operational March One half of the sites working in integrated mode April Test of Data Base distribution within sites June 4 Tier2 initial prototypes ready October MC production of 20% of the events needed by CMS December