Photoproduction of neutral Mesons at ELSA
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1 SFB-TR 16 Photoproduction of neutral Mesons at ELSA Hartmut Schmieden Physikalisches Institut der Universität Bonn Crystal Barrel TAPS Collaboration GWU/CS seminar March 4, 2008 Photo: Klopp University of Bonn, Main Building
2 Photoproduktion von Mesonen an ELSA Outline Motivation ELSA accelerator Experimental setup - polarised photon beams - CB-TAPS detector selected recent results - ηp/n photoproduction - K0S Σ+ photoproduction - ω photoproduction Summary & Outlook - double polarisation - Φp/n & Λ(1405)
3 Mass & Structure r tte a m 4% dark energy D. Clowe et al., APJ 648 (2006) L109 A direct empirical proof of the existence of dark matter dark matter Bullet Cluster (Chandra X-ray telescope) red: ordinary matter blue: dark matter
4 Mass & Structure
5 Mass & Size of the ucleon GaμνGaμν 0 energy Δp Δx > ħ Epot ~ r trace anomaly m = E/c2 mass without mass J. Wheeler F. Wilczek distance size excitation spectrum Ericson & Hüfner P B57 ('73) 604
6 Excitation of the ucleon Δ(1232) S11(1535) Ba Ca atom nucleon
7 Excitation of the ucleon 1952 Long & agle (Chicago Cyclotron) π+/π-+p (Eπkin ~ 180 MeV) σtot π++p π-+p π π * p p isospin 3/2 decay angular distribution * p π isospin 1/2 and 3/2 spin 3/2 Lπ P33(1232) Mpπ from Gottfried-Weisskopf, Vol II, Figs. III.5 & 6 Mpπ isospin 3/2 spin 3/2
8 Spectroscopy: Quark models ucleon spectroscopy Löhring, Metsch, Petry, EPJ A10, 395(2001) * resonances missing states? structure? + parity -
9 Spectroscopy: Open questions pattern of states γ + (non-π) + structure of specific states internal degrees of freedom? - 3q 3q-g hybrids q-2q quark-diquark correlations qqq-qqbar baryon-meson molecules chiral meson-baryon dynamics *,Δ,Y π,k π,k > = qqq> + qqq qq> + qqq g> +... mechanism of meson photoproduction? - role of t-channel processes? polarization ρ,ω,φ ℙ,π0,η
10 ELSA Bonn University S-beamline E-beamline 0 15 m
11 Photo: D.Elsner
12 Detector setup: Crystal-Barrel/TAPS beamline S 6.6m 3,3m TAPS Magnet e beam - MW PC 2 collimator 352 drift chamber scint. fiber M W PC radiator goniometer TOF CB BaF2 12 X0 Θ = scint. Bars tagger 18-92% E0 Eγ = E0 Ee' e- dump 1290 CsI(Tl) 16 X0 Θ = π0 2γ η 2γ, 3π0 KS0 2π0 ω π0 γ
13 ELSA: Polarised beams longit. polarized electrons circular polarization reciprocal lattice diamond pancake e--pol. e- beam Møller 56% coherent bremsstrahlung linear polarization Pγmax S. Kammer 3.2 GeV runtime/days 50 % Pγ,circ 2.6 GeV Pe D. Elsner, H. Eberhardt 1.3 GeV Eγ = Eγ 1 + ⅓(1-Eγ/E0) E0 1 ⅔(1-Eγ/E0) + (1-Eγ/E0)2 H. Olsen & L.C. Maximon, PR 114 (1959) 887
14 selected results p (γ, η) p neutral meson ID V. Crede, A. Süle, D. Elsner,... counts η γγ η 3π0 η 3π0 10 MeV Eγ = θcm = MeV 22 MeV Mγγ M6γ
15 selected results p (γ, η) p unpol. data set O. Bartholomy, V. Crede,... complete experiment S11(1535) MAMI GRAAL CLAS CB-ELSA D15(2070) PWA 8 independent observables dσ/dω P, T Σ 4 'well chosen' double spin asymmetries more observables for 2ps & vectormesons Chiang & Tabakin, PRC55 (97) 2054 V. Crede, O. Bartolomy et al., PRL 94 (2005) , EPJ A33 (2007) 133
16 selected results p (γ, η) p linear polarisation η Θcm e' e ω,q Φ p counts D. Elsner et al., EPJ A33 (2007) 147 z Φ (deg) dσ = dσ0 [ 1+ Pγ Σ cos 2Φ ]
17 selected results p (γ, η) p linear polarisation D. Elsner et al., EPJ A33 (2007) 147 Σ η-maid D15(1675) Σ Eγ= 1250 MeV D13(1520) D13(1520) P13(1720) Θcm BoGa PWA θηcm GRAAL: J. Ajaka et al., PRL 81 new: O. Bartalini et al., arxiv:
18 γ p p η - missing state? double polarisation: long. pol. target & lin. pol. beam?d (2070) 15? G 1/2+ 1/2- } instead with D15(2070) -1 0 cos Θ +1 A. Sarantsev, priv. comm.
19 selected results d (γ, η) neutron target pr el im in ar y B. Krusche, I. Jägle (Basel) Fermi smearing unfolded bump in nη channel also GRAAL data peak in M(ηn) narrow interference S11(1535)/S11(1650) interference S11(1535)/D13(1520) role of D15(1675)? exotic state? P11(1670)?? Σ in pη (GRAAL) STAR07 proceedings need n (γ,η) double pol.
20 selected results p (γ, K0) Σ+ ass. strangeness 1100 kinematic fit p p 3 0 M(pπ0) Σ+ K 0 S dσ/dω (μbarn/sr) R. Castelijns (Groningen), R. Ewald (Bonn) 1200 w/o 1840 M(π0π0) 2100 cos Θηcm BoGa PWA P11(1840) Usov-Scholten P13 P33??? [solid] [broken] R. Castelijns et al., accepted EPJ A (2008)
21 selected results p (γ, K0) Σ+ ass. strangeness R. Ewald (Bonn) Σ R 0 pr el im in ar y 1550 ± 100 MeV K-MAID Eγ <1550 MeV 0 Θcm Eγ >1550 MeV cos Θ CBELSA-TAPS Castelijns et al (nucl-ex/ ) Lawall et al (Eur. Phys. J. A24, 275(2005)) cm
22 selected results p (γ, 2π0/π0η) p 2 ps mesons M. Fuchs, E. Gutz, I. Horn, V. Sokhoyan, U. Thoma, E. Klempt (Bonn) ρ suppressed t-channel suppressed π0 π0 / π0 η clean channels
23 selected results p (γ, ω) p ω mesons Frank Klein (thesis, Bonn) Penner et al., PR C66 (2002) ω ω ℙ,π0 photon - plane Jres 3/2 P11(1710) * Shklyar et al. (Giessen group) PR C71 (2005) PR C72 (2005) reaction -plane Jres 5/2 P11(1710) decay -plane dσ = dσ0 [ 1+ Pγ Σ(π) cos 2Φ ]
24 selected results p (γ, ω) p ω mesons Frank Klein (thesis, Bonn) ω ω ℙ,π0 photon - plane Σ Penner et al., PR C66 (2002) * p reaction -plane Σπ decay -plane t y r a in im l re Θcm ℙ-exchange 0 π0- exchange dσ = dσ0 [ 1+ Pγ Σ(π) cos 2Φ ] Θcm
25 vector mesons ω and Φ!! ω Φ reaction dynamics? pomeron exch. role of π/η exch. exotics p/n/d targets B-T asymm's Φ ω ℙ,π0 Φ K+K- * requires K+K- detection in forward direction
26 summary & outlook SFB-TR 16 nucleon resonances neutral meson ELSA Crystal Barrel / TAPS detector ηp - new D15(2070)? - Σ resonance decomposition - need beam-target polarisation ηn - sharp structure in exct.-function - conventional exotic?? - need beam-target polarisation K0SΣ+ - x-sec P11/P13/P33(1840) - Σ & P to include into PWA - need beam-target polarisation ωp - x-sec resonance decomposition - Σ & Σπ favour resonances - need beam-target polarisation Φp/n - need beam-target polarisation
27 summary & outlook TAPS Crystal Barrel pol. target double polarisation setup at beamline E longitudinally polarised butanol target circularly polarised photon beam (polarised electrons) linearly polarised photon beam (coherent bremsstrahlung) tagger
28 summary & outlook SFB-TR 16 γ+p η+p pol. target Ch. Schmidt Crystal Barrel TAPS
29 outlook forward spectrometer SFB-TR 16 K+ id Φ K+ Kω π+ π- π0 K+ Λ(1405) K π K Λγ 36% nπ 0 Σ L=1 uds singlet state?? Λ(1520) splitting? Λ(1405) π0 Σ0 100% Λ(1405) Zeichnung: Dieter Walther K molecule?? where is singlet? scattering length?
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