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Comparison of QGS with Different String Framentations

Comparison of QGS with Different String Framentations. J. Yarba Fermilab Geant4 Hadronic Meeting 3/20/2013. General Remarks. Done within test19 QGS is paired with G4QGSMStringFragmentation (older code) G4LundStringFragmentation (newer version) Compared vs FTF – always paired with

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Comparison of QGS with Different String Framentations

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  1. Comparison of QGS with Different String Framentations J. Yarba Fermilab Geant4 Hadronic Meeting 3/20/2013

  2. General Remarks • Done within test19 • QGS is paired with • G4QGSMStringFragmentation (older code) • G4LundStringFragmentation (newer version) • Compared vs FTF – always paired with • G4LundStringFragmentation • Compared vs NA49, NA61 data Julia Yarba, FNAL – 3/20/2013

  3. Test19:158GeV p on C -> p, pbar, n, pi+, pi- dN/dxF QGS+G4LundStringFragm shows good results at high energy for secondary pbar, pions Julia Yarba, FNAL – 3/20/2013

  4. Test19:158GeV p on C -> p, pbar, pi+, pi-, d<pT>/dxF Julia Yarba, FNAL – 3/20/2013

  5. Test19:31GeV p on C -> pi- +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  6. Test19:31GeV p on C -> pi- +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  7. Test19:31GeV p on C -> pi+ +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  8. Test19:31GeV p on C -> pi+ +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  9. Test19:31GeV p on C -> p +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  10. Test19:31GeV p on C -> p +X (different theta bins) Julia Yarba, FNAL – 3/20/2013

  11. Test19:31GeV p on – K+/pi+ 20<theta<140mrad Julia Yarba, FNAL – 3/20/2013

  12. Test19:31GeV p on – K+/pi+ 140<theta<240mrad Julia Yarba, FNAL – 3/20/2013

  13. Summary • Is there a particular reason why not use G4LundStringFragmentation with QGS ??? • In my opinion, QGS+G4LundStringFragmentation gives good results at high energy (158GeV) • In the range of several tens GeV (e.g. 31GeV) the “old” approach seems better (FTF+G4Lund or QGS+G4QGSM) • I think potentials of QGS should be revisited Julia Yarba, FNAL – 3/20/2013

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