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ATLAS and CMS activities

ATLAS and CMS activities. Albert De Roeck CERN. ECFA/DESY meeting St Malo 12-15 April 2002. LHC Prospects. New date for first beams/collisions: 1/4/2007 Initial physics run starts in 2007  ~10 fb -1 (2.10 33 cm -2 s -1 )

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ATLAS and CMS activities

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  1. ATLAS and CMS activities Albert De Roeck CERN ECFA/DESY meeting St Malo 12-15 April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)

  2. LHC Prospects • New date for first beams/collisions:1/4/2007 • Initial physics run starts in 2007 ~10 fb-1 (2.1033cm-2 s-1) • Depending on the evolution: 200-300 fb-1 in 5-6 years (3.4-10.1033cm-2 s-1) • Studies ongoing for 1.1035cm-2 s-1 (SLHC) • Needs changes in machine and detectors •  ~3000 fb-1in 3-4 years, i.e. by the end of 2010 or so • CMS & ATLAS preparing for first beam in 2007 • Concentrate on hard & software • Main questions are on trigger/DAQ, using gold plated physics channels • Exploring of new physics studies not main activity now Discovery potential has been demonstrated for key processes • Planned/existing physics review studies • ATLAS physics TDR exist since 2000, may be redone in 2005 • CMS physics TDR planned for 2005, starting to prepare during 2002 ATLAS & CMS prospects Albert De Roeck (CERN)

  3. ATLAS and CMS Plans • Common LC/LHC studies • There is interest but not yet much activity (5-10 people/exp for now) • We need to start with a fewspecific questions/studies • (Agree on luminosities etc.) • ATLAS:Global fits using masses of measured particles, to scan and constrain the susy spaceExpect gain due to sleptons on M0 Add branching ratio & cross section measurements Will be initially based on the ‘old’ LHC benchmark points CMS: interest to start such activity/using new benchmark points • ATLAS & CMS: check on gain of precise measurements of 01 (and other gaugino’s) for reconstructing squark masses (mass splitting) • CMS: Combining heavy higgs (LHC) with light higgs (LC) measurement ATLAS & CMS prospects Albert De Roeck (CERN)

  4. ATLAS and CMS Plans • Benchmark points • ATLAS: so far study of point E(*) (SPS 2(**)), maybe B (SPS 1a) next • CMS: point B, C (SPS 3) , E and G for trigger studies and reconstruction points I,L (SPS 4) for heavy Higgs to Tau ( point I could be replaced by SPS1b ) • SLHC study: points M, K, H used (no SPS equivalent) • Non-mSUGRA models: take SPS selected points • CMS: Combined studies of extra dimensions ? Plan for first results end of June In the following: • A reminder of LHC reach, relevant for this group • New studies in CMS, e.g. on susy mass reconstruction (*) BDEGMOPW points (**) Snowmass points & slopes ATLAS & CMS prospects Albert De Roeck (CERN)

  5. Example: LSP from LC Impact of the precise knowledge of the LSP from the LC on the neutralino two and slepton masses LSP mass LSP mass ATLAS & CMS prospects Albert De Roeck (CERN)

  6. CMS Visiting IP5… CMS getting into shape ATLAS & CMS prospects Albert De Roeck (CERN)

  7. Example: The CMS experiment • Tracking • Silicon pixels • Silicon strips • Calorimeters • PbW04 crystals • for Electro-magn. • Scintillator/copper • for hadronic part • 4T solenoid • Instrumented iron • for muon detection • Jet Energy scale • to 1.0% • EM energy scale • to 0.1% • Luminosity • to better than 5% ATLAS & CMS prospects Albert De Roeck (CERN)

  8. Process Events/sEvents/yearOther machines W e 15 108 104 LEP / 107 Tev Z ee 1.5107107 LEP 0.8107104 Tevatron 1051012108 Belle/BaBar 0.001104 (m=1 TeV) H 0.001104 (m=0.8 TeV) QCD jets 102 109107 pT > 200 GeV Expected Event rates Huge event rates: The LHC will be a W-factory, a Z-factory, a top factory, a Higgs factory etc.. ATLAS & CMS prospects Albert De Roeck (CERN)

  9. SM Higgs search Production and decay modes: ATLAS & CMS prospects Albert De Roeck (CERN)

  10. Expected Results for the Higgs - Will discover the Higgs in the range 100 GeV  1 TeV (if exists) - Precision on the measurement of the mass between 0.1-1% ATLAS & CMS prospects Albert De Roeck (CERN)

  11. H  ZZ(*)  4 leptons • clean signal, mass resolution 1% • precision on muon momentum comes from combining muon chamber with tracker info ATLAS & CMS prospects Albert De Roeck (CERN)

  12. Light Higgs search If mh < 140 GeV : gg  h   most promising channel, although BR only 10-3 … motivation for high resolution ECAL (PbWO4 crystals: 1% at 100 GeV) ATLAS & CMS prospects Albert De Roeck (CERN)

  13. Light Higgs search _ Recent: h  bb in tth production Also results on H  ATLAS & CMS prospects Albert De Roeck (CERN)

  14. Exclusive Higgs A recent development: search for exclusive Higgs production pp p H p -jet gap gap H h p p beam -jet Needs roman pots Cross section ~ 1 fb Khoze et al. p’ dipole roman pots dipole roman pots p’ ATLAS & CMS prospects Albert De Roeck (CERN)

  15. Invisible Higgs ATLAS & CMS prospects Albert De Roeck (CERN)

  16. Heavy Higgs • at large tan , bb A/H and tb H production strongly enhanced!! • assume Msusy = 1 TeV • important channels: COVERED • A/H   • A/H   • H   • H  tb Working hard to cover low tan - high mA region … ATLAS & CMS prospects Albert De Roeck (CERN)

  17. Heavy MSSM Higgs search (3) NEW: at low tan , we may exploit the sparticle decay modes: A, H  20 20  4l+ ETmiss F. Moortgat ATLAS & CMS prospects Albert De Roeck (CERN)

  18. Susy measurements Atlas physics TDR ATLAS & CMS prospects Albert De Roeck (CERN)

  19. Susy Mostly  complicated decay chains ATLAS & CMS prospects Albert De Roeck (CERN)

  20. Susy Decay chain example ATLAS & CMS prospects Albert De Roeck (CERN)

  21. Susy discovery Limits S. Abdoulin ATLAS & CMS prospects Albert De Roeck (CERN)

  22. Susy measurements Atlas physics TDR: LHC Point 5 m0=100 GeV m1/2=300 GeV tan = 2.1 sgn()=+ A=300 GeV ATLAS & CMS prospects Albert De Roeck (CERN)

  23. Susy measurements Atlas physics TDR ATLAS & CMS prospects Albert De Roeck (CERN)

  24. Benchmark points ATLAS & CMS prospects Albert De Roeck (CERN)

  25. Benchmark Points ATLAS & CMS prospects Albert De Roeck (CERN)

  26. g 643.3 tL 412.5 bL 522.5 tR 600.5 bR 549.7 c40 379.1 qL 570 c30 358.8 qR 549 c20 186.8 lL 211.4 c2± 379.7 lR 145.8 c1± 186.0 c10 = LSP 99.6 Study of point B (SPS1) M. Chiorboli ATLAS & CMS prospects Albert De Roeck (CERN)

  27. (15% bL, 10% bR) p b (35 % bL, 22% bR) (0.2 %) b (60 %) p Decay chain • Event final state: •  2 high pt isolated leptons OS •  2 high pt b jets • missing Et ATLAS & CMS prospects Albert De Roeck (CERN)

  28. p b b p First step: c20 l+l- c10 10 fb-1 Fit result: Etmiss > 50 GeV ATLAS & CMS prospects Albert De Roeck (CERN)

  29. p b b p Sbottom reconstruction Assuming M(c10) known! ATLAS & CMS prospects Albert De Roeck (CERN)

  30. Sbottom mass 10 fb-1 Result of fit: Generated masses: ATLAS & CMS prospects Albert De Roeck (CERN)

  31. p b b p Gluino reconstruction Etmiss > 150 GeV ATLAS & CMS prospects Albert De Roeck (CERN)

  32. Result of fit: Generated mass: Gluino mass 10 fb-1 ATLAS & CMS prospects Albert De Roeck (CERN)

  33. Generated values: with 60 fb-1 60 fb-1 Result of fit: ATLAS & CMS prospects Albert De Roeck (CERN)

  34. g 919.8 tL 589.4 bL 723.0 tR 800.8 bR 771.3 c40 545.3 qL 814 c30 532.4 qR 780 c20 294.8 lL 299.6 c2± 546.1 lR 193.4 c1± 294.5 c10 = LSP 152.5 Point G ATLAS & CMS prospects Albert De Roeck (CERN)

  35. Sbottom peak Result of fit: Generated masses: ATLAS & CMS prospects Albert De Roeck (CERN)

  36. Guino peak Result of fit: Generated mass: ATLAS & CMS prospects Albert De Roeck (CERN)

  37. Result of fit: estimation Generated values: This needs better understanding of the SM bkg behaviour! ATLAS & CMS prospects Albert De Roeck (CERN)

  38. Point B, with 10 fb-1 • estimation of M(l+l-)max • sbottom reconstruction with Resol. ~ 10 %, but 2 sbottoms not resolved • gluino reconstruction with Resol. < 10 % • M(g) - M(b) estimation, independent of M(c10), with Err ~ 4 % Point B, with 60 fb-1 • Maybe we can separate the 2 sbottoms Conclusions Point G, with 60 fb-1 • Sbottom and gluino seem to be visible ATLAS & CMS prospects Albert De Roeck (CERN)

  39. Stop Searches Missing ET and transverse l mass Stop mass and cross section Channels S/B for SM and SM+SUSY ATLAS & CMS prospects Albert De Roeck (CERN)

  40. Rare Top Decays S. Slabospitsky ATLAS & CMS prospects Albert De Roeck (CERN)

  41. Graviton Searches Traczyk, Wrochna MG=1000 GeV C=0.01 KK excitations in the RS model Search Reach MG=2000 GeV C=0.01 ATLAS & CMS prospects Albert De Roeck (CERN)

  42. p p  physics • observation: provided efficient measurement of forward scattered protons, one can study high-energy  collisions at the LHC • Highlights: • gg CM energy W up to/beyond 1 TeV (and under control) • Large photon flux F therefore significant gg luminosity • Complementary (and clean) physics to pp interactions, eg studies of exclusive production of the Higgs boson, W pairs might be possible opens new field of studying very high energy gg physics ATLAS & CMS prospects Albert De Roeck (CERN)

  43. p p Two-photon interactions at the LHC + total  cross section …. ATLAS & CMS prospects Albert De Roeck (CERN)

  44.  physics SUSY: Higgs: H0 s ~ 10 pb (at W=MH=200 GeV) clean signatures: both transversal and longitudinal missing energy ! it cannot be missed!! ATLAS & CMS prospects Albert De Roeck (CERN)

  45. And more… -Precision measurements MW to 15 MeV, Mtop to 1.5 GeV anomalous gauge couplings, sin2W, rare top decays, B-physics, CP violation studies -MSSM Higgs bosons -Extra dimensions -New heavy gauge bosons -Strong interactions in the W sector -Technicolor -Compositeness up to scales of 40 TeV MSSM Higgs New W boson W mass Top quark mass LHC detectors must be prepared for the unknown ATLAS & CMS prospects Albert De Roeck (CERN)

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