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PAC Meeting Proposal A2-7/05 Mainz, 29th September 2005 Andreas Thomas

Helicity Dependence of Meson Photoproduction on the Proton. 650h approved with A. PAC Meeting Proposal A2-7/05 Mainz, 29th September 2005 Andreas Thomas. The new Frozen Spin Target for Crystal Ball. Tagged CW photon beam. 4 p - detector. Frozen spin target (30mKelvin, 0.4Tesla).

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PAC Meeting Proposal A2-7/05 Mainz, 29th September 2005 Andreas Thomas

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  1. Helicity Dependence of Meson Photoproduction on the Proton 650h approved with A PAC Meeting Proposal A2-7/05 Mainz, 29th September 2005 Andreas Thomas

  2. The new Frozen Spin Target for Crystal Ball Tagged CW photon beam 4p- detector Frozen spin target (30mKelvin, 0.4Tesla) Similar to Bonn Target [C.Bradtke et al., NIM A436, 430 (1999)] Technical concept: Horizontal Dilution refrigerator Beam along cryostat axis j symmetric, q>1600 Thin internal holding coil on shield (longitudinal,transverse) Loading along cryostat axis

  3. GDH-physics on the proton Circularly polarized photons on longitudinally polarized protons 1) Test of the GDH sum rule 2) More detailed information on resonance properties and multipole amplitudes by investigating the helicity structure of partial reaction channels

  4. GDH sum rule verified for the proton GDH sum rule on the proton D.Drechsel et al. Phys. Rev. D 63, 114010 (2001) Gerasimov-Drell-Hearn sum rule and related integrals

  5. LEGS, A.Sandorfi, PWA BadHonnef: Good aggreement in measured range, But Problem: p0 extrapolation in Forward direction ?? Egmax=430MeV

  6. Helicity Dependence of Meson Photoproduction 2) More detailed information on resonance properties and multipole amplitudes by investigating the helicity structure of partial reaction channels status of present results and future goals: singlep0 - production (D13 (1520), F15 (1680)) h- production (F15 (1680), P11 (1710)) double p0 - production (D13 (1520), P11 (1440), P11 (1710))

  7. Partial reaction channels Input for PWA to extract resonance parameters Measurements in 1998 and 2003 at MAMI with DAPHNE and Bonn PT

  8. Quark Model Classification of Baryons qqq; only uds Oktett Dekuplett Simple Constituent quark picture: Proton p(938): |uud> ~ |hhi> Spin 1/2 Delta D(1232): |uud> ~ |hhh> Spin 3/2 M1-Transition (Small 2.5% E2)

  9. p-prod. -> D(1232) ->E2/M1 Ratio [Phys. Rev. Lett. 84, 5950 (2000)] Connection between and and Multipoles and Resonances gp np+ Ds[mb] MAID2000 gp pp0 N N Eg[MeV] s s Eg[MeV]

  10. Resonanz D13(1520) Connection between and and Multipoles and Resonances N N s s

  11. MAID2003

  12. h-Photoproduction MAID2003 DSG E Dominated by S11(1535) at low photon energy  E=1  calibration PBPT

  13. h-Photoproduction MAID2003 DSG E

  14. K+L-Photoproduction KAON-MAID DSG E e.g. Missing resonance D13(1900)

  15. 2 p0 Photoproduction

  16. Physics Letters B 624 (2005) 173-180 Hirata et al., Phys. Rev. C 67, 034601 (2003) Nacher et al., Nucl. Phys. A 697, 372 (2002) Improve, extend to higher energies, angular distributions and invariant masses for s1/2and s3/2 !

  17. Egmin=700MeV

  18. Bonn [R.Beck] E0=1200MeV Egmin~400MeV

  19. Experimental equipment Standard CB-TAPS (mini-TAPS) Cerenkov-detector under preparation (P.Pedroni, P. Bartolomez) Upgraded Tagger with Moeller Polarimeter Polarized frozen-spin target

  20. Beam time estimate Reactions: Target: in 2 cm butanol (includ. dilution and filling factors) Helicity asymmetry: dilution factor h= dilution, Background, P= Pg PT background from butanol and walls, He Goal: Required beam time: Beam: Data acquisition capability: 1000 events/s (800 to 1400 MeV) Polarization: in DEg= 600 MeV Efficiency (detection and reconstruction)

  21. Beam time estimate Dt = 250 h (800 -1400 MeV) 250 h (500 - 800 MeV) 150 h (200 – 500 MeV) 100 h target polarization, flux, Moeller, etc. 800 h total (polarized) In addition about 200 h with liq. Hydrogen (in combination with other measurements) For h and p0p0 reduced binning and stat. accuracy

  22. Summary • helicity observables carry valuable information on resonance properties • and reaction mechanisms Main goal: single p0 - production (D13 (1520), F15 (1680)) h- production (F15 (1680), P11 (1710)) double p0 - production (D13 (1520), P11 (1440), P11 (1710)) In addition: charged p - production

  23. g + p g K+ + L p + p- (~ 64%) n + p0(~ 36%) 2g g + p g K+ + S0 g + L Hyperon Photoproduction • Important for investigations of nucleon resonances • A crucial test of QCD based chiral perturbation theories in the strange quark sector Threshold Energy ~ 911 MeV Threshold Energy ~ 1046 MeV T C Jude, The University of Edinburgh, Strangeness Photoproduction A2 Collaboration meeting, Mainz, September 2008

  24. First cluster from K+ < 3ns Secondary cluster from K+gm++ nm decay > 10ns Identifying strange mesons • A new method of tagging a strange meson reaction channel • Identify the K+ decay within the crystals of the Crystal Ball K+ m++nm(~ 63%)Mean lifetime of K+ ~ 12 ns p++p0(~ 21%) T C Jude, The University of Edinburgh, Strangeness Photoproduction A2 Collaboration meeting, Mainz, September 2008

  25. The CB/TAPS@MAMI collaboration J.Brudvik, J.Goetz, B.M.K.Nefkens, S.N.Prakhov, A.Starostin, and I.Suarez,University of California, Los Angeles, CA, USA P.Aguar, J.Ahrens, H.J.Arends, D.Drechsel, E.Heid, O.Jahn,D.Krambrich, M.Martinez, M.Rost, S.Scherer, A.Thomas,L.Tiator, D. von Harrach and Th.Walcher, Institut fürKernphysik, University of Mainz, Germany R.Beck, M.Lang, A.Nikolaev, S.Schumann, and M.Unverzagt,Helmholtz--Institut für Strahlen- und Kernphysik, Universität Bonn, Germany S.Altieri, A.Braghieri, A.Panzeri, P.Pedroni, T.Pinelli, and T.Rostomyan, INFN Sezione di Pavia, Pavia, Italy J.R.M.Annand, R.Codling, E.Downie, D.Glazier, J.Kellie,K.Livingston, J.C.McGeorge, I.J.D.MacGregor, R.O.Owens,D.Protopopescu, G.Rosner, Department of Physics and Astronomy,University of Glasgow, Glasgow, UK C.Bennhold, W.Briscoe, H.Haberzettl, Y.Ilieve, A.Kudryavtsev, and I.Strakovsky,George Washington University, Washington, USA S.N.Cherepnya, L.V.Fil'kov, and V.L.Kashevarov , B.N.Lebedev Physical Institute, Moscow, Russia V.Bekrenev, S.Kruglov, A.Kulbardis, and N.Kozlenko, Petersburg Nuclear Physics Institute, Gatchina, Russia B.Boillat, C.Carasco, B.Krusche, F.Pheron, and F.Zehr, Institut für Physik University of Basel, Basel, Ch P.Drexler, F.Hjelm, M.Kotulla, K.Makonyi, V.Metag, R.Novotny,M.Thiel, and D.Trnka, II. Physikalisches Institut, University of Giessen, Germany D.Branford, K.Foehl, C.M.Tarbert and D.P.Watts, School of Physics, University ofEdinburgh, Edinburgh, UK G.M.Gurevich, V.Lisin, R.Kondratiev and A.Polonski, Institute for Nuclear Research,Moscow, Russia J.W.Price, California State University, Dominguez Hills, Carson, CA, USA D.Hornidge, Mount Allison University, Sackville, NB, Canada P.Grabmayr and T.Hehl, Physikalisches Institut, UniversitätTübingen, Tübingen, Germany N.S.Borisov, S.B.Gerasimov, and Yu.A.Usov,JINR, Dubna, Russia H.Staudenmaier, Universität Karlsruhe, Karlsruhe, Germany D.M.Manley, K.Bantawa,Kent State University, Kent, USA A.Knezevic, M.Korolija, M. Mekterovic and I.Supek, Rudjer Boskovic Institute, Zagreb, Croatia D.Sober, Catholic University, Washington DC M.Vanderhaeghen, College of Williams and Mary, Williamsburg, USA

  26. The GDH collaboration J.Ahrens9,S.Altieri15,16,J.R.M.Annand6,G.Anton3,H.-J.Arends9,K.Aulenbacher9,R.Beck9,C.Bradtke1,A.Braghieri15,N.Degrande4,N.d'Hose5,H.Dutz2, S.Goertz1,P.Grabmayr17,K.Hansen8,J.Harmsen1, S.Hasegawa13,T.Hasegawa11,E.Heid9, K.Helbing3,H.Holvoet4, L.VanHoorebeke4,N.Horikawa14,T.Iwata13,P.Jennewein9, T.Kageya14,B.Kiel2,F.Klein2,R.Kondratiev12,K.Kossert7,J.Krimmer17,M.Lang9,B.Lannoy4,R.Leukel9,V.Lisin12,T.Matsuda11,J.C.McGeorge6,A.Meier1,D.Menze2,W.Meyer1,T.Michel3,J.Naumann3,A.Panzeri15,16,P.Pedroni15,T.Pinelli15,16,I.Preobrajenski9,12,E.Radtke1,E.Reichert10,G.Reicherz1,Ch.Rohlof2, G.Rosner6, D.Ryckbosch4,F.Sadiq6,M.Sauer17,B.Schoch2, M.Schumacher7,B.Seitz7, T.Speckner3,M.Steigerwald9,N.Takabayashi13,G.Tamas9, A.Thomas9, R.van de Vyver4, A.Wakai14,W.Weihofen7,F.Wissmann7,F.Zapadtka7,G.Zeitler3 1Institute of Experimental Physics, Ruhr-University,Bochum, Germany 2Physics Institute, University of Bonn, Germany3Physics Institute, University of Erlangen-Nuernberg,Erlangen, Germany 4Nuclear Physics Laboratory, Gent, Belgium 5CEA Saclay, DSM/DAPNIA/SPhN, Gif-sur-Yvette, France 6Department of Physics & Astronomy, University of Glasgow, U.K.7II.Physics Institute, University of Goettingen, Germany8Department of Physics, University of Lund, Sweden9,10Institute of Nucl. Physics and Inst. of Physics, University of Mainz, Germany 11Faculty of Engineering, Miyazaki University, Miyazaki, Japan 12INR, Academy of Science, Moscow, Russia 13,14 Department of Physics and CIRSE, Nagoya University, Nagoya, Japan 15,16 INFN Sezione di Pavia and Dept. of Nucl. Physics of the University , Pavia, Italy 17 Physics Institute, University of Tuebingen, Germany

  27. A. Fix and H. Arenhövel, MKPH-T-05-1

  28. h-Photoproduction MAID2003 E DSG

  29. Assafiri et al., PRL 90 (2003) 222001

  30. A2 Time-Schedule for parallel running in the years 2006-2007 -12/2005 Tagger upgrade, Magnet installation 01/2006 Calibration and commissioning Tagger, test goniometer 04/2006 Detector tests with H2-Target and Crystal Ball 04/2006Experiments with unpolarized Targets: total: 3805h MAMI B A2-7/03 3He 885MeV h mesic nuclei 300h MAMI C A2-2/05 H2 1500MeVrare h-decay950h MAMI C A2-4/05 H2 1500MeVMagnetic moment S11 (550h)* MAMI C A2-1/05 H2 1500MeV in medium w(100h)* MAMI B A2-5/05 H2 885MeVRecoil (400h)* MAMI C A2-5/05 H2 1500MeVRecoil (500h)* MAMI C A2-3/05 H2 1500MeVrare h´-decay700h MAMI C A2-4/05 D2 1500MeV Magnetic moment S11 550h MAMI C A2-10/05 D2 1500MeV h-Prod. (200h)* MAMI C A2-1/05 D2 1500MeV in medium w(100h)* MAMI C A2-11/05 D2 1500MeV ds/dW,S(350h)* MAMI C A2-6/05 16O, C 1500MeVAsym. 2 proton205h MAMI C A2-1/05 12C 1500MeV in medium w 100h MAMI C A2-1/05 natCa 1500MeV in medium w 100h MAMI C A2-1/05 93Nb 1500MeV in medium w 400h MAMI CA2-1/05natPb 1500MeV in medium w 500h 05/2007 2 month for installation frozen spin target, CB on rails 07/2007Experiments with polarized Targets:total: 885h in 2007 MAMI B A2-7/05 H-But. 885MeV GDH proton 250h MAMI C A2-7/05 H-But. 1500MeV GDH proton (250h)* MAMI C A2-8/05 H-But. 1500MeV G-Asymmetry 635h 2008 MAMI B A2-9/05 D-But. 885MeV GDH neutron 350h MAMI C A2-9/05 D-But. 1500MeV GDH neutron (450h)* MAMI C A2-10/05 D-But. 1500MeV E-Observ. h-Prod. 700h MAMI C A2-11/05 D-But. 1500MeV S,G,E-Observ., KL600h MAMI C A2-12/05 D-But. 1500MeV Transvers. PT Coherent p01200h ( )* Experiments in frames can be done parallel

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