1. Assoiated production

2. Hyperon photoproduction

3. Lambda polarization normal to production plane (parity!!) weak decay:

4. Sigma polarization

5. Hyperon polarization in photoproduction

8. Michael Ostrick, Universität Bonn pseudoscalar mesons γ p p π 0, γ p p η strangeness γ p K Λ, γ p K Σ Selected results: Photoexcitation of N*/*-resonances

9. Extraction of resonance parameters Michael Ostrick, Universität Bonn amplitude analyses resonance parameters single-channel isobar models (e.g. MAID) multi-channel approaches SAID, Giessen-coupled-channel-model dynamical models relation of N* parameters to quark-models, lattice QCD Bonn-Gatchina (A. Sarantsev et al. hep- ph/0407211) isobar analysis (Breit-Wigner/K-matrix) u- and t-channel relativistically invariant analyticity/(unitarity)

10. Michael Ostrick, Universität Bonn N*/* resonances in PWA N* *

11. selected results: π 0 and η photoproduction Michael Ostrick, Universität Bonn ELSA

12. Michael Ostrick, Universität Bonn PRL 94(2005)012004 γ p p π 0 Δ(1232)

13. Michael Ostrick, Universität Bonn PRL 94(2005)012004 γ p p π 0 Data in PWA: Crystal-Barrel π 0 & η TAPS/MAMI π 0 & η (low energy) GRAAL π 0 & η lin. polarization Bonn γp nπ + (isospin !) Δ(1232)

14. Michael Ostrick, Universität Bonn PRL 94(2005)012004 S 11 (1535) D 13 (1520) 2-3% P 11 (1440) D 33 (1700) F 15 (1680) S 11 (1650) F 37 (1950) P 33 (1920) γ p p π 0 Δ(1232)

15. Michael Ostrick, Universität Bonn PRL 94(2005)012004 Δ(1232) S 11 (1535) D 13 (1520) 2-3% P 11 (1440) D 33 (1700) F 15 (1680) S 11 (1650) F 37 (1950) P 33 (1920) γ p p π 0

16. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η MAMI GRAAL CLAS CB-ELSA PWA S 11 (1535)

17. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η MAMI GRAAL CLAS CB-ELSA PWA S 11 (1535)

18. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η: PWA P 13 (1720) S 11 (1535)

19. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η: PWA P 13 (1720) S 11 (1535) No 3 rd S 11 needed

20. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η: PWA P 13 (1720) proposed "new" D 15 (2070) m = 2068 ± 22 MeV Γ = 295 ± 40 MeV S 11 (1535)

21. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η: PWA P 13 (1720) proposed "new" D 15 (2070) m = 2068 ± 22 MeV Γ = 295 ± 40 MeV 5/2 - 1/2 - 1/2 + S 11 (1535)

22. Michael Ostrick, Universität Bonn PRL 94(2005)012003 γ p p η: PWA P 13 (1720) proposed "new" D 15 (2070) m = 2068 ± 22 MeV Γ = 295 ± 40 MeV 5/2 - 1/2 - 1/2 + S 11 (1535) (double) polarization observables !

23. Michael Ostrick, Universität Bonn γ p p η: double polarization long. pol. target, circ. pol γ : helicity 1/2 - 3/2 long. pol. target, lin. pol γ : 5/2 - 1/2 - 1/2 +

24. Michael Ostrick, Universität Bonn strangeness production SAPHIR: EPJ A 19, 251 (2004) EPJ A 24, 275 (2005) γ p K + Λ γ p K + Σ 0 γ p K 0 Σ +

25. Michael Ostrick, Universität Bonn strangeness production γ p K + Λ energy dependent discrepancy up to 20% between SAPHIR and CLAS

26. Michael Ostrick, Universität Bonn strangeness production γ p K + Λ energy dependent discrepancy up to 20% between SAPHIR and CLAS PWA fit with the same N*/* states as in π 0 and η production is possible (hep-ex/0506011)

27. Michael Ostrick, Universität Bonn strangeness production: γ p K + Λ Linear rise -> s,p wave interference!

28. Michael Ostrick, Universität Bonn strangeness production: γ p K + Λ S 11 (1650) P 13 (1720) P 11 (1710)? new P 11 (1840)? Linear rise -> s,p wave interference!

29. Michael Ostrick, Universität Bonn strangeness production: γ p K + Λ D 13 (1895) ? (P 11 (1900) ? 3 rd S 11 (1900) ?) S 11 (1650) P 13 (1720) P 11 (1710)? new P 11 (1840)?

30. Michael Ostrick, Universität Bonn strangeness production: γ p K + Λ D 13 (1895) ? (P 11 (1900) ? 3 rd S 11 (1900) ?) S 11 (1650) P 13 (1720) P 11 (1710)? new P 11 (1840)?

31. Michael Ostrick, Universität Bonn strangeness production: γ p K Σ (1700)D 33 (1940)D 33 N(1840)P 11 γ p K + Σ 0 γ p K 0 Σ + Main resonance contributions:

32. Michael Ostrick, Universität Bonn strangeness production: γ p K Σ (1700)D 33 (1940)D 33 N(1840)P 11 γ p K + Σ 0 γ p K 0 Σ + Main resonance contributions: (double) polarization and electroproduction!

33. Michael Ostrick, Universität Bonn photoexcitation of N*/* resonances N* *