AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS

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AZIMUTHAL DISTRIBUTIONOFDIJETSINDIFFRACTIVE
DIS

• David álek
• December 8, 2005
• Diffractive Meeting, Antwerpen

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BOSON GLUON FUSION TWO GLUON EXCHANGE MODEL
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AZIMUTHAL ANGLE
definition of the azimuthal angle in gamma-p CMS
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CUTS
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DATA
99-00 data sub-trigger 61 prescale lt 15
1223 events
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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
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MONTE CARLO
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QUARK GENERATED JET CORELATION
LEADING JET
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(No Transcript)
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QUARK GENERATED JET CORELATION
SECOND JET
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(No Transcript)
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GENERATED RECONSTRUCTED JET CORELATION
LEADING JET
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(No Transcript)
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GENERATED RECONSTRUCTED JET CORELATION
SECOND JET
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(No Transcript)
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AZIMUTHAL ANGLE
Problem at generator level no W-shape
Problem at reconstructed level Lorentz
transformation
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PROBLEM AT GENERATOR LEVEL
azimuthal distribution is not smooth
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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
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GENERATED RECONSTRUCTED ELECTRON
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CORELATION BETWEEN GENERATOR RECONSTRUCTED LEVEL
SCATTERED ELECTRON ENERGY
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xPomeron etamax CORELATION BETWEEN GENERATOR
RECONSTRUCTED LEVEL
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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
gt -1
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zvertex BASIC KINEMATICAL VARIABLES
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SCATTERED ELECTRON
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xgamma E - pz
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DIFFRACTIVE VARIABLES
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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
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JET CHARACTERISTICS
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LEADING JET
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SECOND JET
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HFS CALIBRATION ???
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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