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Standard Model Physics at the LHC

Standard Model Physics at the LHC. Albert De Roeck CERN and University of Antwerp and the IPPP Durham. Contents. QCD at the LHC Particle production Jets Underlying events PDFs Electroweak measurements W,Z boson production Multi-boson production Drell Yan

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Standard Model Physics at the LHC

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  1. Standard Model Physics at the LHC Albert De Roeck CERN and University of Antwerp and the IPPP Durham

  2. Contents • QCD at the LHC • Particle production • Jets • Underlying events • PDFs • Electroweak measurements • W,Z boson production • Multi-boson production • Drell Yan • B physics (very briefely) • Forward physics (not in this talk) Info from M. Grunwald, FP Schilling, B. Epp, L. Di Ciaccio…

  3. +forward +forward

  4. Detectors are completed

  5. Beam Halo and Splashes in CMS

  6. Beam Halo and Splashes in ATLAS

  7. The beam goes through CMS

  8. LHC Kinematics/QCD evolution Is this a region of “safe –x”??? ? Evolution of PDFs to high Q2 & low x is important at the LHC Precision? Level of approximation? CCFM/BFKL?, non-linear effects? Test it at HERA!!

  9. Process Events/sEvents/yearOther machines W e 15108 104 LEP / 107 Tev Z ee 1.5107 107 LEP 0.8107 104 Tevatron 105 1012108 Belle/BaBar 0.001104 (m=1 TeV) H 0.001104 (m=0.8 TeV) Black Holes 0.0001 103 MD=3 TeV n=4 Event Rates for pp at s=14 TeV • In the first 3 minutes at 1033cm-2s-1 • LHC will produce per experiment: •  ~5000 W,e decays • ~ 500 Z,e decays • >2.107 bottom quark pairs  ~150 top quark pairs •  ~10 Higgs particles (MH=120 GeV) •  ~20 gluino pairs with mass 500 GeV • A quantum black hole (MD = 2TeV) • …. • Startup luminosity at 10/14 TeV will be much lower, perhaps like 1031-1032cm-2s-1 (less bunches/current) • Record ~ 20K events/30Gbyte

  10. 10  14 TeV

  11. QCD Studies @ LHC Huge cross sections: Eg for 1 fb-1 ~ 10000 events with ET> 1 TeV 100 events with ET> 2 TeV E.g. Jet Physics •  PDFs • Jet shape • Underlying event • s • Diffraction • BFKL studies • low-x • New physics? • … Understanding QCD at 14 TeV will be one of the first topics at LHC …and a whole b-physics and top-physics program

  12. Early Soft Minimum-Bias Measurements The pile-up for the future: ~4 events at low and ~20 events at high luminosity Charged particle density LHC? • Energy dependence of dN/d? • Vital for tuning UE model • Only requires a few thousand events. • PYTHIA models favour ln2(s); • PHOJET suggests a ln(s) dependence. At 14 TeV startup!!

  13. Single Particle Spectra

  14. Charged Particle Distributions

  15. …Not only ATLAS & CMS

  16. Underlying Event Studies

  17. Underlying Event Studies

  18. Jet Studies

  19. New Physics with Jets Eg Contact Interactions  Using dijet event ratios in  Test up to  ~ 10 TeV during ‘09 already

  20. Event Shape Studies

  21. Photon Production

  22. W and Z Boson Production Event signatures

  23. W and Z Selections

  24. W Boson Production

  25. W/Z Cross Section Measurements

  26. Parton Density Determinations @ LHC

  27. Parton Distributions % Precision on the PDFs Brian Foster (DIS08)

  28. Sin2eff Measurements Forward backward asymmetries in Z decays

  29. W Mass Determination Eg CMS PTDR with 1 (10) fb-1 determine MW to 20-40 (10-20) MeV

  30. W,Z+ jets Measurements Important background for searches for new physics, eg SUSY…

  31. Zbb measurements

  32. Di-boson production

  33. Triple Gauge Couplings

  34. b-physics

  35. b-physics

  36. b-physics

  37. Summary • Experiments at the LHC eagerly awaiting data. • Early on: no lack of statistics, sensitivity to rare processes • QCD • MC understanding with early data • Underlying event studies (multiple interactions) • New regime for jet data already with 10 fb-1. New physics at high PT? • Electroweak Measurements • Improve constraints on SM parameters (couplings, mass, production) • Ultimately MW ~ 10 MeV, sin2eff ~ 10-4 • Di-boson studies with starting with ~100 pb-1 • Systematics will very fast become an issue • B physics • Initial program: Testing QCD in new energy regime. Later BSM…

  38. Cross Sections

  39. Di-boson production

  40. Cross Sections

  41. Cross Sections In 2008 we have to rediscover the Standard Model at 10/14 TeV and compare to calculations and generators. …And tune generators

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