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Physics in (US) CMS James G. Branson UC San Diego

Physics in (US) CMS James G. Branson UC San Diego. US CMS Collaboration Meeting Riverside CA. LHC Commissioning Schedule. Luminosity for a 5 s Higgs Signal. 5 sigma signal possible in one year of running from 100 GeV to 600 GeV. From 150 to 450, 5 sigma effect could come in a few months.

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Physics in (US) CMS James G. Branson UC San Diego

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  1. Physics in (US) CMS James G. Branson UC San Diego US CMS Collaboration Meeting Riverside CA US CMS Physics J.G. Branson

  2. LHC Commissioning Schedule US CMS Physics J.G. Branson

  3. Luminosity for a 5s Higgs Signal • 5 sigma signal possible in one year of running from 100 GeV to 600 GeV. • From 150 to 450, 5 sigma effect could come in a few months. • WW and ZZ(*) using leptons • One area in which CMS claims to be be significantly better than Atlas is in the 100-150 GeV Higgs mass region. • This might also be the region accessible to the Tevatron. • Hardware trigger and software must be ready at the beginning of running. US CMS Physics J.G. Branson

  4. SUSY in one week • High energy can pay off immediately. • Squark gluino search starts the first day of running. • Missing energy plus jets. • Not the CMS strong suit. • Need tracker to measure jets and missing energy well. US CMS Physics J.G. Branson

  5. Joint Technical Board TRIDAS (Online farm) Core Computing & Software Physics Reconstruction & Selection Martti Pimia David Stickland Paris Sphicas Sergio Cittolin ReconstructionGroup. RPROM(Stephan Wynhoff) Simulation Group. SPROM (Albert De Roeck) Architecture Task Force. CAFE(Jim Branson) … Developments Last Year • Physics Reconstruction and Selection (PRS): new project in CMS; along with CCS and TriDAS (online): CPT US CMS Physics J.G. Branson

  6. Physics Reconstruction & Selection • Consists of four groups • (ECAL) Electron/Photon C. Seez • Muons U. Gasparini/D. Acosta • (HCAL) Jet/Missing ET S. Eno/S. Kunori • (Tracker) b/t (vertex) M. Manelli/L.Silvestris • Charge: evaluate full chain (from Lvl-1 to offline) of physics selection for CMS. • First priority (till end 2002): the HLT: study, design & implement algorithms and code to provide the rejection/efficiency needed for CMS physics plan • Then turn to Physics TDR (two volumes) for ~ 2004 • Responsibility for detector reconstruction, calibration and simulation software. US CMS Physics J.G. Branson

  7. Developments Last Year • New LHC schedule  new date for DAQ TDR • First beams in early 06, first physics in Aug 06 • Submission date was always set to T0(LHC)-3.5 yrs. • With new schedule, submission goes to end (Nov 30) 2002 • Schedule & Milestones: • Unchanged, especially for the HLT/PRS part(s) • What gets delayed is decisions on technologies to use, etc., but not the results of the studies. • However, with another year’s technology with us, we can expect that most of the data transfer issues are no longer with us, so we just concentrate on (a) the algorithm itself and (b) the CPU needed Computing TDR also end 2002 Physics TDR ~2004 US CMS Physics J.G. Branson

  8. High Level Trigger • High Level Trigger: included in “PRS” • Defining “Level-2” as anything doable without tracking information, Level-2 is ~ complete • Level 2.5 might include pixels • Level 3 uses the tracker • Level 4 includes physics analysis • High Level Trigger: (from Paris) • “Level-2” equivalent algorithms in place • Now working on “Level-3” US CMS Physics J.G. Branson

  9. US CMS S&C Project • Management staff selected. • Lothar Bauerdick L1 • Lucas Taylor deputy • Vivian O’Dell L2 UF • Ian Fisk L2 CS • US Project is a model for CMS and CERN plan. • This is your user facility. • Core software engineers job is 25% service. US CMS Physics J.G. Branson

  10. CMS “Physics” Meetings • Meetings made available to us • All PRS meetings at 4:30 Geneva time on either Tuesday or Wednesday (biweekly). • RPROM, SPROM on Mondays. • CAFÉ (Architecture) and DAQ Thursday. • Please attend and participate. • Minutes and slides available. US CMS Physics J.G. Branson

  11. New US Meeting Format • Agreed at ASCB meeting to combine physics and Users meetings into monthly (slightly longer) sessions. • Brief reports from • User facility • Core Software • S&C Project Management and ASCB • US component of PRS groups • JetMet (HCAL) • Muon (Muon) • e Gamma (ECAL) • B-Tau (Tracker) • Talks • Discussion Forum… US CMS Physics J.G. Branson

  12. US Effort • US has a strong and growing involvement in the muon PRS group. • JetMET proceeding but needs more US effort. • Detector group is responsible according to spokesman. • This is mainly a US responsibility. • We need new effort from HCAL groups to add to current Maryland work. • Some e/g work, but, would like to play a bigger role in the US. • Time to move into photons? • Tracker group growing in US. • Should we go into b/t or use tracker in other PRS groups? US CMS Physics J.G. Branson

  13. Tracker Needed for Everything • Use in muon measurement long part of the CMS plan. • Material in tracker very important in e/g analysis. • Special tracking for electrons. • Large fraction of energy radiated. • Conversion of radiated photons is hurting. • Photon conversion important. • p0 rejection. • Many charged particles in jets spiral into endcap. • Limits jet energy resolution • Limits ET resolution. • Tracker (b/t) group large and powerful. • The definition of Level 3. US CMS Physics J.G. Branson

  14. Analysis Center(s) in the US • As a large part of the US program, we must do significant physics analysis in the US. • One or more centers will help us do this. • Centers even help people at institutes. • A center which fails to reach critical mass is detrimental. • Wasted resources, unfairly distributed. • We must plan carefully. • We must require sufficient local resources to seed critical mass. • Alternative is linked US community not located at a center. US CMS Physics J.G. Branson

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