1. Generator of PP-elastic scattering events A. Galoyan 18/3/2015 1. Simulations of elastic P-P and Pbar-P interactions in frame of Unified systematics of elastic scattering data 2. Parameterization of hadronic part of pp elastic scattering at COSY energies 3. Structure of code for simulation of PP-elastic scatterings under ROOT 4. Results of PP elastic scatering simulations with hadronic and Coulomb parts. 5. Comparison of our simulations with new exp. data from Koala 6. Simulation of inelastic PP interactions in the frame of FtfEvtGen in PandaRoot 7. Conclusion 1

2. Diffferential cross section of elastic PbarP scatterings 2 R. Cahn, Z. Phys. C15, 253-260 (1982) Coulombie-Hadronic Interference in an Eikonal Model

3. adTa_Fig8 3 New parameterization of anti-P P elastic scattering differential cross section Black disk model approximation with diffuse boundary Imaginary part of elastic scattering amplitude Real part of elastic pbar-p amplitude. Derivative dispersion relations J.B. Bronzan, G.L. Kane, U.P. Sukhatme, Phys. Lett. 49B (1974) 227; M.M. Block, R.N. Cahn, Rev. Mod. Phys. 57 (1985) 563

4. adTa_Fig8 4 Fitting expression for elastic amplitude Fitting results Fitting results (low energy) 94 sets of exp data were used from Plab=181 MeV/c up to sqrt(S)=1800 GeV

5. Fiting results (intermediate and high energies ) 5 94 sets of exp data were used from Plab=181 MeV/c up to sqrt(S)=1800 GeV

6. Fitting results for elastic PP- interactions 68 sets of exp. data on PP-scattering were used 6

7. Interpolation of parameters R pp (R pbarp ) and d pp (d pbarp ) 7

8. Interpolation of Ratio of Real to Imaginary parts of the elastic Pbar-P scattering amplitude 8 “Structure of antiproton-proton elastic scattering amplitude” A. Galoyan, V. Uzhinsky, JETP Letters, v. 94, No 7 (2011)

9. “Improved Systematic of pp Elastic Scattering Data” V. Uzhinsky and A. Galoyan, hep-ph 1210.1338 (2012) 9 Expression for amplitude of elastic PP и PbarP scatterings At high energies :

10. 10 Сomparison of calculations with exp.data on elastic PP scatterings

11. Results of Totem experiment on pp-scatterings at 7 TeV EPL, 95 (2011) 41001, EPL 96 (2011) 21002 R=1.07 fm, d=0.375 fm 11 V. Uzhinsky, A. Galoyan, Nov 2011. e-Print: arXiv:1111.4984 "Description of the Totem experimental data on elastic pp-scattering at sqrt(s)=7 TeV in the framework of unified systematic of elastic scattering data.“

12. Parameterization of hadronic part of pp elastic scattering at COSY energies D. Albers et al., (EDDA Collaboration), Phys. Rev. Lett. 78, 1652 (1997) Proton-Proton Elastic Scattering Excitation Functions at Intermediate Energies 1.139,1.168, 1.197, 1.225, 1.254, 1.283, 1.312, 1.341, 1.369, 1.398, 1.427, 1.456, 1.485, 1.513, 1.542, 1.571, 1.6, 1.628, 1.657, 1.686, 1.715, 1.743, 1.772, 1.801, 1.83, 1.859, 1.887, 1.916, 1.945, 1.974, 2.003, 2.031, 2.06, 2.089, 2.118, 2.146, 2.175, 2.204, 2.233, 2.261, 2.29, 2.319, 2.348, 2.377, 2.405, 2.434, 2.463, 2.492, 2.521, 2.549, 2.578, 2.607, 2.636, 2.664, 2.693, 2.722, 2.751, 2.78, 2.808, 2.837, 2.866, 2.895, 2.924, 2.952, 2.981, 3.01, 3.039, 3.067, 3.096, 3.125, 3.154, 3.182, 3.211, 3.24, 3.269, 3.298, 3.326, 5.5 12

13. Parameterization of hadronic part of pp elastic scattering at COSY energies ! 13

14. Parameterization of hadronic part of pp elastic scattering at COSY energies It is not well! 14

15. Parameterization of hadronic part of pp elastic scattering at COSY energies It is not well! Chi^2/NoF=1.017 15

16. Parameterization of hadronic part of pp elastic scattering at COSY energies It is acceptable! Chi^2/NoF=2.97 16

17. Class for simulation of elastic P-P interactions void Run(Double_t Plab, Int_t nevents, Double_t tetmin=-1.) void Init(Double_t Plab=20., Double_t tetmin=-1.); Double_t SampleInvariantT (Double_t plab, Int_t Z ); PPElastic methods : Double_t SampleThetaLab( plab, Z); methods for sampling of emmision angles Main data of class fT, fTetaCMS, fThetaLab, rho, B, sigma_tot etc. 17 Double_t SampleThetaCMS( plab, Z); Function for PP-simulations and creating file with root Tree. runAndSaveTree(Nevent, Plab, Double_t Tetmin=-1,char *fname=«PPel.root») Code for simulation of PP elastic

18. Run MC program for simulation of elastic PP scatterings at COSY energies 18 root >.L ppelast.C++ There are 2 possibilities: root > runAndSaveTree(1000, 2.1); «PPelast.root» file with hadronic part of PP elastic 1000 events at 2.1 GeV/c projectile mometum is created root > runAndSaveTree(1000, 2.1, 0.1, «PP.root»); «PP.root» file with hadronic, coulomb, interf. parts of PP elastic 1000 Events at initial momentum 2.1 GeV/c and theta_min = 0.1 deg. is created

19. Run MC program for simulation of elastic PP scatterings at COSY energies 19

20. Results of MC program for simulation of elastic PP scatterings and Koala exp. data 20 Exp. data on proton-proton elastic scattering are described well

21. Simulation of inelastic PP scatterings as background events Q. Hu et al., Eur. Phys. J. A50(2014)10, 15 Using FTF generator from PandaRoot we can simulate inelastic PP scatterings /pgenertors/FtfEvtGen  make –f Ftfmake FTFGen exe file is produced To simulate inelastic PP scatterings in the input file PbarP.mac, put #particle proton # generator bertini #plab momentum of projecile in GeV/c #events required number of generated events >./FTFGen PbarP.mac FTF.root file will be created with all characteristics of produced particles 21

22. Simulation of inelastic PP scatterings as background events FTF.root file for PP inelastic events at initial momentum 2.8 GeV/c Number of produced protons and pi+ mesons is big. They can create background for elastic PP-interactions 22

23. Simulation of inelastic PP scatterings for background events 23 pi+ mesons can give main background for recoil protons in elastic PP interactions

24. Conclusion 1 New parameterization of PP elastic scattering is proposed at COSY energies. Good results are obtained at comparison with experimental data. 2. MC program is created with Hadronic part of PP elastic scattering based on the new parameterization. Coulomb and Interference parts of elastic scatterings are also implemented in the MC program. 3. Good description of Koala exp. data on PP elastic interactions are obtained. 4. For simulation of inelastic PP interactions for background events, FtfEvtGen from PandaRoot can be used. 24

26. Results of MC program for simulation of elastic PbarP events at COSY energies Hadronic part of PP (new parametrisation and USESD) 22

27. STT hits (A. Sokolov) Elastic scattering only Implementation of “hadronic” part of elastic PbarP scattering in DPM generator in PandaRoot