Eugene Pasyuk Jefferson Lab for the CLAS Collaboration Moscow, September 20-23, 2012 XIII International Seminar on Electromagnetic Interactions of Nuclei.

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Presentation transcript:

Eugene Pasyuk Jefferson Lab for the CLAS Collaboration Moscow, September 20-23, 2012 XIII International Seminar on Electromagnetic Interactions of Nuclei

` E. Pasyuk, EMIN-2012, Moscow, September * Introduction * Experimental tools * Single pion photporoduction * K +  photoproduction * Summary

` 3 E. Pasyuk, EMIN-2012, Moscow, September

` * Masses, widths, and coupling constants not well known for many resonances * Most models predict more resonance states than observed N* Constituent quark model Lattice QCD 4 E. Pasyuk, EMIN-2012, Moscow, September

` 4 Complex amplitudes: 16 real polarization observables. Complete measurement from 8 carefully chosen observables. πN has large cross section but in KY recoil is self-analysing 4 Complex amplitudes: 16 real polarization observables. Complete measurement from 8 carefully chosen observables. πN has large cross section but in KY recoil is self-analysing I. S. Barker, A. Donnachie, J. K. Storrow, Nucl. Phys. B (1975). 5 E. Pasyuk, EMIN-2012, Moscow, September

` 6 Experiment cross section, spin observables Experiment cross section, spin observables TheoryLQCD, quark models, QCD sum rules QCD sum rules, …TheoryLQCD, quark models, QCD sum rules QCD sum rules, … Reaction Theory dynamical frameworks Reaction Theory dynamical frameworks Amplitude analysis → multipole amplitudes → phase shifts Amplitude analysis → multipole amplitudes → phase shifts σ,dσ/dΩ,Σ,P,T (beam-target) E,F,G,H, (beam-recoil) C x,C z,O x,O z, (target-recoil) L x,L z, T x,T z, Coupled channels: resonance parameter resonance parameterExtraction This session Hiroyuki Kamano E. Pasyuk, EMIN-2012, Moscow, September

` 7

` A B C Injector LINAC Experimental Halls * E: 0.75 –6 GeV * I max : 200μA * Duty Cycle: 100% * δE/E: 2.5x10 -5 * Polarization: ≥85% * Simultaneous distribution to 3 experimental Halls 8 E. Pasyuk, EMIN-2012, Moscow, September

` Torus magnet 6 superconducting coils Gas Cherenkov counters e/  separation, 256 PMTs Time-of-flight counters plastic scintillators, 684 photomultipliers Drift chambers 35,000 cells target + start counter target + start counter Electromagnetic calorimeters Lead/scintillator, 1296 photomultipliers 9 E. Pasyuk, EMIN-2012, Moscow, September

` Linearly polarized photons: coherent bremsstrahlung on oriented diamond crystal Circularly polarized beam produced by longitudinally polarized electrons 10 E. Pasyuk, EMIN-2012, Moscow, September

` 11 E. Pasyuk, EMIN-2012, Moscow, September

` HDIce Solid Deuterium-Hydride (HD) – a new class of polarized target * Polarized at very high magnetic field and very low temperature * Transferred to in-beam cryostat * Spin can be moved between H and D with RF transitions * All material can be polarized with almost no background 12 E. Pasyuk, EMIN-2012, Moscow, September

` * γp → π 0 p, π + n * γp → ηp * γp → KY (K + Λ, K + Σ 0, K 0 Σ + ) * γp → π + π - p, ωp, ρp, ϕ p * γn → π - p * γn → π + π - n * γn → Σ - K +, ΛK 0 ….. Reactions γp → ηp, ηp, K + Λ provide isospin filter, directly coupled only to N* 13 E. Pasyuk, EMIN-2012, Moscow, September

` 14

` CLAS SP07 MAID07 SP08 SN08CLAS SP07 MAID07 SP08 SN08 M. Dugger et al. PRC 79, (2009) Constrained SAID fit at higher energies. Constrained SAID fit at higher energies. Does not need any new resonances Does not need any new resonances 15 E. Pasyuk, EMIN-2012, Moscow, September

` Forum for MAX-IV Ring, Lund, Nov 2011  E=10 MeV 16 preliminary preliminary Michael Dugger, ASU E. Pasyuk, EMIN-2012, Moscow, September

` Forum for MAX-IV Ring, Lund, Nov 2011  E=10 MeV 17 Michael Dugger, ASU preliminary preliminary E. Pasyuk, EMIN-2012, Moscow, September

` Forum for MAX-IV Ring, Lund, Nov 2011  E=10 MeV 18 Michael Dugger, ASU preliminary preliminary E. Pasyuk, EMIN-2012, Moscow, September

` preliminary preliminary S. Strauch, USC 19 E. Pasyuk, EMIN-2012, Moscow, September

` For W< 1.75 GeV all of the models represent the data fairly well. For W> 1.75 GeV none of the models represents the data well. 20 preliminary preliminary E. Pasyuk, EMIN-2012, Moscow, September

` 21 Michael Dugger, ASU E. Pasyuk, EMIN-2012, Moscow, September

` PRELIMINARY cos(   )=-1 to -0.6 cos(   )=-0.6 to -0.2cos(   )=-0.2 to 0.2 cos(   )=0.2 to 0.6 cos(   )=0.6 to 1.0 Jo McAndrew 22 E. Pasyuk, EMIN-2012, Moscow, September

` 23 Michael Dugger, ASU E. Pasyuk, EMIN-2012, Moscow, September

` 24 Michael Dugger, ASU E. Pasyuk, EMIN-2012, Moscow, September

` 25

` 26 E. Pasyuk, EMIN-2012, Moscow, September

` recoil polarization P excitation function g11: W=1.7 – 2.8 GeV (unpolarized beam & target) M.E. McCracken et al., PRC 81, (2010) 27 E. Pasyuk, EMIN-2012, Moscow, September

` Nikonov et al’.’s refit of Bonn-Gachina multi-coupled- channel isobar model mix includes: S11 wave, P13(1720),P13(1900),P11(1840) Bradford et al Bradford et al. PRC 75, (2007), 28 E. Pasyuk, EMIN-2012, Moscow, September

` preliminary preliminary C. Patterson 29 E. Pasyuk, EMIN-2012, Moscow, September

` C. Patterson preliminary preliminary 30 E. Pasyuk, EMIN-2012, Moscow, September

` C. Patterson preliminary preliminary 31 E. Pasyuk, EMIN-2012, Moscow, September

` C. Patterson preliminary preliminary 32 E. Pasyuk, EMIN-2012, Moscow, September

` (PhD L. Casey, CUA) preliminary preliminary 33 E. Pasyuk, EMIN-2012, Moscow, September

` (PhD L. Casey, CUA) preliminary preliminary 34 E. Pasyuk, EMIN-2012, Moscow, September

` 35

` ✔ - published ✔ - acquired 36 E. Pasyuk, EMIN-2012, Moscow, September

` * γp → ηp * γp → η’p * γp → π + π - p ωp, ρp, ϕ p * γn → π - p * γn → π + π - n * γn → Σ - K +, ΛK 0 ….. We have measured cross sections an polarization observables 37 E. Pasyuk, EMIN-2012, Moscow, September

` * “compete measurement” in pseudoscalar meson photoproduction is reality * Data collection with proton and deuteron targets is complete * Data are being analyzed 38 E. Pasyuk, EMIN-2012, Moscow, September

` 39

` * 1968: 11 events from the ABBHHM bubble chamber experiment * 1976: 7 events from the AHHM streamer chamber experiment * 1998: 250 events from the SAPHIR collaboration (first differential cross sections) * 2006: over 2×10 5 events from the CLAS collaboration * 2009: another few orders of magnitude from CLAS g11 data set 40 E. Pasyuk, EMIN-2012, Moscow, September

` * SAID * MAID * NH (K. Nakayama and H. Haberzettl) 41 M. Dagger et al. PRL 96, (2006) E. Pasyuk, EMIN-2012, Moscow, September

` K. Nakayama and H. Haberzettl, Phys. Rev. C 73, (2006). Different versions of the model yield similar results for cross section, but quite different predictions for beam asymmetry Predictions for beam asymmetry are quite different 42 M. Dugger et al. PRL 96, (2006) E. Pasyuk, EMIN-2012, Moscow, September

` 43 S 11 (1535) S 11 (1650) S 11 (2090) P 11 (1710) P 11 (2100) P 13 (1720) P 13 (1900) D 13 (1520) D 13 (1700) D 13 (2080) g η ŃN = 1.91 S 11 (2090) P 11 (2100) P 13 (1900) D 13 (1700) g η ŃN = 0.43 S 11 (2090) P 11 (2100) P 13 (1900) D 13 (1700) D 13 (2080) g η ŃN = 0.25 S 11 (1535) S 11 (1650) S 11 (2090) P 11 (1710) P 11 (2100) P 11 (2400) P 13 (1900) D 13 (1700) D 13 (2080) g η ŃN = 1.33 S 11 (1535) S 11 (2090) P 11 (1710) P 11 (2100) D 13 (1700) D 13 (2080) g η ŃN = IIIIIIIVV E. Pasyuk, EMIN-2012, Moscow, September

` M. Williams et al. PRC 80, (2009) 44 E. Pasyuk, EMIN-2012, Moscow, September

` The  appears 100% polarized when created with a fully polarized beam. 45 E. Pasyuk, EMIN-2012, Moscow, September

` * Energy and angle averages are consistent with unity. * No model predicted this CLAS result. 46 E. Pasyuk, EMIN-2012, Moscow, September

` 47 E. Pasyuk, EMIN-2012, Moscow, September