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AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS

AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS. David Šá lek December 8, 2005 Diffractive Meeting, Antwerpen. BOSON GLUON FUSION & TWO GLUON EXCHANGE MODEL. AZIMUTHAL ANGLE. definition of the azimuthal angle in gamma-p CMS. CUTS. DATA. 99-00 data sub-trigger 61 prescale < 15.

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AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS

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  1. AZIMUTHAL DISTRIBUTIONOFDIJETSINDIFFRACTIVE DIS David Šálek December 8, 2005 Diffractive Meeting, Antwerpen

  2. BOSON GLUON FUSION & TWO GLUON EXCHANGE MODEL

  3. AZIMUTHAL ANGLE definition of the azimuthal angle in gamma-p CMS

  4. CUTS

  5. DATA 99-00 data sub-trigger 61 prescale < 15 1223 events

  6. MONTE CARLO RAPGAP inclusive diffraction for F2D(3) at medium Q2 generator: RAPGAP 2.08/18 files from Tinne Anthonis for 99-00 Boson Gluon Fusion 4344 events QCD Compton

  7. MONTE CARLO

  8. QUARK & GENERATED JET CORELATION LEADING JET

  9. QUARK & GENERATED JET CORELATION SECOND JET

  10. GENERATED & RECONSTRUCTED JET CORELATION LEADING JET

  11. GENERATED & RECONSTRUCTED JET CORELATION SECOND JET

  12. AZIMUTHAL ANGLE Problem at generator level: no W-shape Problem at reconstructed level: Lorentz transformation

  13. PROBLEM AT GENERATOR LEVEL azimuthal distribution is not smooth

  14. LORENTZ TRANSFORMATION gamma-p CMS: 4-vector of incoming proton 4-vector of exchanged gamma q = k – k’ k’ not correctly reconstructed it results in deviation of azimuthal distribution at reconstructed level

  15. GENERATED & RECONSTRUCTED ELECTRON

  16. CORELATION BETWEEN GENERATOR & RECONSTRUCTED LEVEL SCATTERED ELECTRON ENERGY

  17. xPomeron & etamax CORELATION BETWEEN GENERATOR & RECONSTRUCTED LEVEL

  18. COMPARISON OF DATA & MONTE CARLO dead spacal region problem with final state radiation: electron properties basic kinematic variables Lorentz transformation temporary solution: take only those events where there is only the scattered electron in spacal etaLab > -1

  19. zvertex & BASIC KINEMATICAL VARIABLES

  20. SCATTERED ELECTRON

  21. xgamma & E - pz

  22. DIFFRACTIVE VARIABLES

  23. FORWARD MUON DETECTORS PROTON REMNANT TAGGER way to improve agreement between data and MC: FMD noise good agreement needed only to calculate luminosity correctly adding FMD noise decreases MC statistics

  24. JET CHARACTERISTICS

  25. LEADING JET

  26. SECOND JET

  27. HFS CALIBRATION ???

  28. SUMMARY & OUTLOOK retrieve W-shaped azimuthal distribution for BGF at parton level reconstruct electron properties better in order to reveal generated azimuthal distribution at reconstructed level increase statistics by including events with final state radiation with proper corrections to radiated gammas generate Monte Carlo files with two gluon exchange unfolding

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