1. Improvement and tuning of DPM model
A. Galoyan and V. Uzhinsky, 7 Jun. 2017
1. Irregularities of invariant mass distributions in DPM generator found by Albrecht Gillitzer
2. Source of these irregularities in DPM
Preliminary results of the DPM improvement
All calculations with DPM were performed using
PandaRoot installed in HybriLIT cluster in LIT JINR
4. Conclusion 1

2. 2 April 27, 2017 | Albrecht Gillitzer IKP-1 PANDA Group Meeting
Composite States in DPM & FTF (Test of DPM and FTF)
10^6 DPM events at momentum 4.6 GeV/c
10^6 FTF events events at momentum 4.6 GeV/c 2

3. Questions/problems
In contrast to DPM, FTF creates zero-width composed states like Δ, ρ or K* -> Request to Geant4
DPM
FTF
Structures in pπ-, pπ+ and p pbar spectra seen in DPM are not present in FTF -> redesign of DPM
DPM
FTF 3

4. We have analyzed P-Pi mass distributions in DPM processes4

5. Questions/problems
Structures in pπ-, pπ+ and p pbar spectra seen in DPM are not present in FTF -> redesign of DPM
Mpi-p > Ecms/2
Dominant process in DPM - fragmentation of di-quark
and anti-diquark string
Dominant process in FTF 5

6. We were trying to implement FTF algorithm in DPM
Results 6

7. Cross sections of Pbar-P processes in DPM and FTF models
Dynamics of the Pbar-P and Pbar-A reactions in the FTF model.
A. Galoyan, A.Ribon, V. Uzhinsky //Contributions of the conference - IWNT35: 2016
arXiv:
DPM cross sections
FTF cross sections 7

8. 8 Using FTF process cross sections we have preliminary results in DPM

9. Using FTF process cross sections we have preliminary results in DPM9

10. Pair mass distributions in new version of DPM10

11. Conclusion Sources of irregularities found by Albrecht are studied.
The improvement of DPM generator has just started.
Improved fragmentation functions are implemented
in DPM generator
4. FTF cross sections of Pbar-P processes are installed
5. After tuning and complete testing, new improved DPM will be installed and commited in PandaRoot. 11