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Assoiated production. Hyperon photoproduction Lambda polarization normal to production plane (parity!!) weak decay:

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Presentation on theme: "Assoiated production. Hyperon photoproduction Lambda polarization normal to production plane (parity!!) weak decay:"— Presentation transcript:

1 Assoiated production

2 Hyperon photoproduction

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

4 Sigma polarization

5 Hyperon polarization in photoproduction

6

7

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/ ) 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) γ p p π 0 Δ(1232)

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

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

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

19 Michael Ostrick, Universität Bonn PRL 94(2005) 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) 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) 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) 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/ )

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* *


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