A.Galoyan 19.05.2015

1

Strange particles production in Pbar-P and Pbar-A Interactions according to FTF model

Content 1. Cross sections of Pbar-P processes in FTF model 2. Comparison of calculations of Pbar-P channels by FTF model with exp. data3. Comparison of calculations of Pbar-P inclusive cross sections with exp. data4. Differential cross sections of Λ-Λbar and Λ-Σbar productions in Pbar-P interactions5. Consideration of Λ and Ks0 kinematical properties produced in Pbar-P reactions6. Cross sections of Λ and Ks0 production in Pbar-Nucleus interactions7. Conclusion

Geant4 9.5 realese (http://geant4.cern.ch/support/source_archive.shtml)Interactions of anti-baryons (including anti-hyperons) and light anti-nuclei with matter have been implemented in the Fritiof (FTF) model. This model is valid for incident anti-baryon energies from 0 to 1 TeV, and for incident anti-nucleus momenta from 150 MeV/c/nucleon up to 1 TeV/c/nucleon. Corresponding anti-baryon and anti-nuclear cross section classes have also been added. New processes were added to handle inelastic reactions of anti-deuterons, anti-tritons, anti-3He and anti-alphas. (from the release Note)

Cross sections of Pbar-P processes in FTF model of Geant4

2

Pbar-P channel cross sections with baryons in final states test22/PbarPchan

3E.Bracci et al.,CERN/HERA 73-1(1973)

Pbar-P annihilation channel cross sections test22/PbarPchan

4Exp. Data: E.Bracci et al.,CERN/HERA 73-1(1973)

Results for inclusive cross sections of Antiproton – Proton reactions Rapidity distributions of pi- mesons in Pbar-P interactions. test22/PbarPinclusive

G.D. Patel et al., Z. Phys. C - Particles and Fields 12,189, 1982 C.P. Ward et al., Nucl. Phys. B153 299 1979 E.E. Zabrodin et al., Phys. Rev.D, V52, N3, 1995 5

Results for inclusive cross sections of Antiproton – Proton reactions Rapidity distributions of pi+ mesons in Pbar-P interactions in a wide energy range

6

Results for inclusive cross sections of AntiProton–Proton reactions Rapidity distributions of protonstest22/PbarPinclusive

E.V. Vlasov, Z. Phys. C - Particles and Fields 13, 95, 1982G.D. Patel et al., Z. Phys. C - Particles and Fields 12,189, 1982J. Chyla, Czech. J. Phys. B 30 1980E .G. Boos et al., Nucl. Phys. B174 45, 1980

7

Differential Cross Sections of PbarP->ΛΛbar / ΛΣbar test22/PbarHyperon

P. D. Barnes et al., Phys. Rev. C 54 2831 (1996)P. D. Barnes et al., Phys Lett B 246 273 (1990) P. D. Barnes et al., Phys Lett B 189 249 (1987)

8

Differential Cross Sections of PbarP->ΛΛbar / ΛΣbar test22/PbarHyperon

P. D. Barnes et al., Phys. Rev. C 54 2831 (1996)P. D. Barnes et al., Phys Lett B 246 273 (1990) P. D. Barnes et al., Phys Lett B 189 249 (1987)

9

Differential Cross Sections of PbarP->ΛΛbar / ΛΣbar at 6 GeV/c test22/PbarHyperon

exp. data: H. Becker et al., Nucl. Phys. B141 48 (1978) 10

Differential Cross Sections of PbarP->ΛΛbar at different momenta test22/PbarHyperon

exp. data: B. Jayet et al., Nuov. Cim. A45, 371 (1978) 11

Inclusive Cross Sections of PbarP->Λ+X and PbarP->Ks0+X processes test22/PbarHyperon

exp.data: S. Banerjee et al., TIFR-BC-78-8

Xf and Pt2 distributions of Ks0 in PbarP->Ks0 +X at Plab=0,76 GeV/c

12

Kinematical distributions of Λ, Λbar, Ks0 produced in PbarP interactions at P=3.6 GeV/c exp data: S. Banerjee et al., TIFR-BC-78-8

13

Kinametical disributios of Λ, Λbar, Ks0 produced in PbarP interactions at P=3.6 GeV/c exp data: S. Banerjee et al., TIFR-BC-78-8

14

Kinametical distributions of Λ and Ks0 produced in PbarP interactions at Plab=12 GeV/c

exp data: D. Bertrand et al., Nucl. Phys. B 128 365 (1977) 15

Kinametical distributions of Λ and Ks0 produced in PbarP interactions at Plab=22.4 GeV/c

exp data: B.V. Batyunya et al., Z. Phys.C 25 213 (1984)

16

Kinametical distributions of Λ and Ks0 produced in PbarP interactions at Plab=100 GeV/c

exp data: D.R. Ward et al., Phys. Lett. 62B 237 (1976) 17

Production cross sections of Ks0 and Λ and produced in PbarA interactions

exp data: F. Balestra et al., Nucl. Phys. A526 415 (1991) 18

Plab = 600 MeV/c H2 He4 Ne20Sigma_Lam 0.65+-0.14 3.67+-0.56 12.3+-2.8 0.0 0.0794696 0.202973 Sigma_Ks0 3.74+-0.56 3.90+-0.53 5.4+-1.1 3.44954 5.88075 12.3137

Plab= 3000 MeV/c H1 H2 TaSigma_Lam 0.35+-0.11 0.81+-0.07 145+-0.6 0.356418 0.59467 6.68568Sigma_Ks0 1.2+-0.05 2.78+-0.15 43.4+-1.2 1.72809 3.85392 62.9568

Plab=4000 MeV/c H1 TaSigma_Lam 0.53+-0.05 193+-12 0.730055 11.553 Sigma_Ks 1.90+-0.07 82+-6 2.00127 68.9514

Kinametical properties of Λ and Ks0 produced in PbarXe interactions at Plab=200 GeV/c

I. Derado et al., Z. Phys. C Particles and Fields 50, 31 36 (1991) 19

Conclusion

1. Differential cross sections of ΛΛbar and ΛΣbar produced in Pbar-P interactions are calculated in FTF model. Anisotropic decay of strings in process b ( diquark- anti-diquark creation ) is included for agreement with corresponding exp. data

2. Kinematical properties of Λ hyperons and Ks0 mesons produced in PbarP processes are calculated in FTF model without and with anizotropic decay and compared with exp. data at different initial momenta.

3. Comparison of Λ hyperon production cross sections in Pbar-Nucleus interactions at low and intermediate energies shows that results of FTF+Bic are essentially lower than exp. data. However, calculated Ks0 meson production cross sections are in reasonable agreement with exp. data. 4. Good results are obtained at comparison of exp data with FTF calculations for Λ hyperons and Ks0 mesons produced in Pbar-P interactions at 100 GeV/c and Pbar-Xe interactions at 200 GeV/c.

20

Pbar-A annihilation at rest.Cu U

Energy spectra of pi+ mesons produced in Pbar–D/Ne at rest

J. Rielberger, Nuclear Physics B (Proc Suppl ) 8 (1989) 288-293 22

Results of FTF validation for Antiproton–Nucleus reactions inflight Momentum distributions of π+ Momentum distributions of Protons

P.L.McGaughey et al., Phys. Rev. Lett. V56, N20, 1986 23

24

Results of FTF validation for AntiProton–Nucleus reactions inflight Angle and energy distributions of pions and protons in Pbar-C /Nbar-C interactions at projectile momentum 750 MeV.c

P.L.McGaughey et al., Phys. Rev. Lett. V56, N20, 1986

Results of FTF validation for AntiProton–Nucleus reactions inflight Kinetic energy spectra of neutrons produced in Pbar-Al, Pbar-Cu at projectile momenta 1.22 GeV/c

25T. von Egidy et al., Eur. Phys. J. A 8, 197 (2000) LEAR collab. data

Results of FTF validation for Antiproton–Nucleus reactions inflight Kinetic energy spectra of neutrons produced in Pbar-Ta, Pbar-U at projectile momenta 1.22 GeV/c

26T. von Egidy et al., Eur. Phys. J. A 8, 197 (2000) LEAR collab. data

Results of FTF validation for Pbar-Nucleus interactions at p= 200 GeV/c Rapidity Ch+, Rapidity Ch- mesons

28Multi-particle production on hydrogen, argon and xenon targets in a streamer chamber by 200 GeV/c proton and antiproton beams. De Marzo et al. Phys. Rev. D26 (1982) 1019

Results for inclusive cross sections of Antiproton–Proton reactions PT

2 of Pi+ mesons PT2 of Protons

14

J. Chyla, Czech. J. Phys. B 30 1980 E .G. Boos et al., Nucl. Phys. B174 45, 1980E.V. Vlasov, Z. Phys. C - Particles and Fields 13, 95, 1982