AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS David Šálek December 8, 2005 Diffractive Meeting, Antwerpen.

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Presentation transcript:

AZIMUTHAL DISTRIBUTION OF DIJETS IN DIFFRACTIVE DIS David Šálek 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 Kinematical cuts:8 < Q 2 < < z vertex < < y Bjorken < < E - p z < 70 Scattered electron cuts:E spacal > 8 R spacal > 9.1 Jet cuts:p T > < eta gamma-p < 0 Diffractive cuts:eta max < 3.2 PRT 0, 1, 2, 3, 4 < 1 FMD 0+1, 2 < 2 x Pomeron < 0.04

DATA data sub-trigger 61 prescale < events

MONTE CARLO RAPGAP inclusive diffraction for F 2 D(3) at medium Q 2 generator: RAPGAP 2.08/18 files from Tinne Anthonis for pomeron udsN = L = pb -1 pomeron cN = L = pb -1 mesonN = L = pb -1 Boson Gluon Fusion 4344 events QCD Compton

MONTE CARLO

QUARK & GENERATED JET CORELATION LEADING JET

QUARK & GENERATED JET CORELATION SECOND JET

GENERATED & RECONSTRUCTED JET CORELATION LEADING JET

GENERATED & RECONSTRUCTED JET CORELATION SECOND JET

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

PROBLEM AT GENERATOR LEVEL azimuthal distribution is not smooth

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

GENERATED & RECONSTRUCTED ELECTRON

CORELATION BETWEEN GENERATOR & RECONSTRUCTED LEVEL SCATTERED ELECTRON ENERGY

x Pomeron & eta max CORELATION BETWEEN GENERATOR & RECONSTRUCTED LEVEL

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 eta Lab > -1

z vertex & BASIC KINEMATICAL VARIABLES

SCATTERED ELECTRON

x gamma & E - p z

DIFFRACTIVE VARIABLES

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

JET CHARACTERISTICS

LEADING JET

SECOND JET

HFS CALIBRATION ???

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