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A. Dbeyssi, le 17/05/2011
o Radiative correction : emission of photon (soft hard and virtual) in initial and final state .
o PandaRoot : Generators and transport models.
o Effect of the PHOTOS package of PANDAROOT : Simulation with radiative correction.
o Monte Carlo Simulations of in PANDAROOT: Study of energy
and angular distribution of electrons and positrons .
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RADIATIVE CORRECTIONS
Virtual and soft photon emission (Born approximation) :
Hard photon emission :
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• Framework of simulation and analysis for the PANDA experiment.
• Extension of FairRoot framework developped at GSI.• Based on Root and Virtual Monte-Carlo (transport
model : Geant3, Geant 4 and Fluka) .
RADIATIVE CORRECTIONS IN PANDAROOT
• EvtGen generator: handle complex decay channels.• DPM (Dual Parton Model) generator : generation and
studies of background events.• UrQMD (Ultra-relativistic Quantum Molecular Dynamic
Model) : used to study collision.
PandaRoot
Event generators of PandaRoot
A. Dbeyssi, le 17/05/2011
Ap
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• The radiative correction are implemented in Pandaratoot with the package PHOTOS :
Emisson of photons as initial and final state radiation (soft and virtual photons) .
• Simulation with\without Photos , analysis and comparison of the obtained spectra for energy and angular distribution of the emitted particles.
• generation of 10 000 events.• Using the Macro : run_sim-tpccombi.C • EvtGen generator : EvtElectronPositron.hh. (M.
GUMBERIDZE)• Geant3 transport model.
RADIATIVE CORRECTIONS IN PANDAROOT
PHOTOS
A. Dbeyssi, le 17/05/2011
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noPhotos
Decay pbarpSystem 1.0 e+ e- ElectronPositron 1;
Enddecay End
RADIATIVE CORRECTIONS IN PANDAROOT
Decay file (.DEC):
A. Dbeyssi, le 17/05/2011
•Proton form factor : R=1 (GE=GM).
•2 values of antiproton momentum : p=1.7 and 10 GeV/c.•analysis of Monte-Carlo in 4π = no detector acceptance.
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RADIATIVE CORRECTIONS IN PANDAROOTA. Dbeyssi, le 17/05/2011
noPhotos Photos
GeVpp 7.1
GeVs
16.12
GeVEe
16.1
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RADIATIVE CORRECTIONS IN PANDAROOT
Electron-positron energy in the laboratory frame at 1.7 GeV:
A. Dbeyssi, le 17/05/2011
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ANGULAR DISTRIBUTION OF THE ELECTRON
Angular distribution of the electron at 1.7 GeV :
A. Dbeyssi, le 17/05/2011
Small difference -> necessary to decrease the widh of the bin.
PhotosnoPhotos
00987.0
0362.0
A
A
00984.0
01435.0
A
A
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PROBABILITY OF PHOTON EMMISION A. Dbeyssi, le 17/05/2011
Probability of photon emmision in PHOTOS
• no γ : 75 %• 1 γ : 21 %• 2 γ : 4 %
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RADIATIVE CORRECTIONS IN PANDAROOTA. Dbeyssi, le 17/05/2011
Energy of emitted photons in the laboratory frame
P = 1.7 GeV/cP =10 GeV/c
Mostly soft photon emission
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RADIATIVE CORRECTIONS IN PANDAROOTA. Dbeyssi, le 17/05/2011
Angular distribution of emitted photons in the laboratory frame
Forward emission of photons
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• Simulation for the channel .
started
• First tests of the Photos have been done
• This work can be extended to : Tracking and reconstruction of the generated
particles inside the detectors. Radiative corrections for the other reactions like
the muon productions. Generator for the hard photon emission :
Thank you
SUMMARY A. Dbeyssi, le 17/05/2011
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RADIATIVE CORRECTIONS IN PANDAROOT
Positron and electron energy distribution in the centre of masse at 1.7 GeV.
A. Dbeyssi, le 17/05/2011