Friday the 18th of May, 2001US CMS Physics J.G. Branson1 Physics in (US) CMS James G. Branson UC San Diego US CMS Collaboration Meeting Riverside CA.

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Presentation transcript:

Friday the 18th of May, 2001US CMS Physics J.G. Branson1 Physics in (US) CMS James G. Branson UC San Diego US CMS Collaboration Meeting Riverside CA

Friday the 18th of May, 2001US CMS Physics J.G. Branson2 LHC Commissioning Schedule

Friday the 18th of May, 2001US CMS Physics J.G. Branson3 Luminosity for a 5  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 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.

Friday the 18th of May, 2001US CMS Physics J.G. Branson4 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.

Friday the 18th of May, 2001US CMS Physics J.G. Branson5 Developments Last Year Physics Reconstruction and Selection (PRS): new project in CMS; along with CCS and TriDAS (online): CPT Joint Technical Board Core Computing & Software Physics Reconstruction & Selection TRIDAS (Online farm) Reconstruction Group. RPROM (Stephan Wynhoff) Simulation Group. SPROM (Albert De Roeck) Architecture Task Force. CAFE (Jim Branson) Paris SphicasSergio Cittolin Martti Pimia David Stickland … …

Friday the 18th of May, 2001US CMS Physics J.G. Branson6 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/  (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.

Friday the 18th of May, 2001US CMS Physics J.G. Branson7 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 T 0 (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

Friday the 18th of May, 2001US CMS Physics J.G. Branson8 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”

Friday the 18th of May, 2001US CMS Physics J.G. Branson9 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.

Friday the 18th of May, 2001US CMS Physics J.G. Branson10 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.

Friday the 18th of May, 2001US CMS Physics J.G. Branson11 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…

Friday the 18th of May, 2001US CMS Physics J.G. Branson12 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/  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/  or use tracker in other PRS groups?

Friday the 18th of May, 2001US CMS Physics J.G. Branson13 Tracker Needed for Everything Use in muon measurement long part of the CMS plan. Material in tracker very important in e/  analysis.  Special tracking for electrons.  Large fraction of energy radiated.  Conversion of radiated photons is hurting.  Photon conversion important.   0 rejection. Many charged particles in jets spiral into endcap.  Limits jet energy resolution  Limits ET resolution. Tracker (b/  ) group large and powerful. The definition of Level 3.

Friday the 18th of May, 2001US CMS Physics J.G. Branson14 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.