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Hyperon production and polarization with CLAS at JLab

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1 Hyperon production and polarization with CLAS at JLab
Sergio Anefalos Pereira Laboratori Nazionali di Frascati (for the CLAS Collaboration) S. Anefalos Pereira July 21, 2010 Spin - Praha

2 Outline Introduction + motivation
Physics observables in photoproduction JLAB/CLAS Results Summary S. Anefalos Pereira July 21, 2010 Spin - Praha

3 Introduction A major goal of hadron physics is to probe the structure of the nucleon and its excited states. The N* spectrum is a direct reflection of the underlying degrees of freedom of the nucleon. Symmetric Constituent Quark Models predict a higher number of excited states Quark and flux-Tube Models predict increased number of states Quark-Diquark models predict fewer states S. Anefalos Pereira July 21, 2010 Spin - Praha

4 Missing Resonances Quark models predict many more baryons that have been observed, “missing” resonances; Many baryon resonances are predicted studying the channels with π, but very few were established; Löhring, Metsch, Petry, EPJ A10, 395(2001) The CLAS program is designed to obtain accurate electromagnetic production cross section and spin observables over a broad kinematic range. Strangeness production is an important part of this program. S. Anefalos Pereira July 21, 2010 Spin - Praha

5 Why studying KY ? To resolve the question of “missing” resonances
have information about the structure of the nucleon Couplings of nucleon resonances to KY final states will differ from the πN, ηN and ππN final states. Self-analyzing weak decay of hyperons allows recoil polarization measurements with high statistics: polarization observables are crucial to extract elementary amplitudes high discriminating power against various models one can have access to all observables (not possible with  channels) S. Anefalos Pereira July 21, 2010 Spin - Praha

6 Polarization observables in pseudoscalar meson production
4 Complex amplitudes: 16 real polarization observables. Complete measurement from 8 carefully chosen observables. Only hyperon can provide recoil polarization N KY recoil targ γ γ targ recoil B T R I. S. Barker, A. Donnachie, J. K. Storrow, Nucl. Phys. B (1975). complete and over-determined linearly polarized photons longitudinally polarized target circ polarized photons transversely polarized target S. Anefalos Pereira July 21, 2010 Spin - Praha 6

7 16 Pseudoscalar Meson Photoproduction Observables
For g + p K+ L: { R. Bradford et al. Phys. Rev. C 73 (2006), M.E.McCracken et.al., PRC 81, (2010) J. McNabb et al. Phys Rev C (2004) R. Bradford et al. Phys. Rev. C 75 (2007), M.E.McCracken et.al., PRC 81, (2010) Single Polarization C. Paterson et al. (Glasgow), to be published C. Paterson et al. (Glasgow), to be published FROST (g9b) data taking ongoing { FROST (g9a) under analysis Beam & Target { Beam & Recoil { Target & Recoil S. Anefalos Pereira July 21, 2010 Spin - Praha 7

8 Define the Spin Observables (unpolarized target)
proton K+ S. Anefalos Pereira July 21, 2010 Spin - Praha

9 Define the Spin Observables (unpolarized target)
proton K+ S. Anefalos Pereira July 21, 2010 Spin - Praha

10 Define the Spin Observables (unpolarized target)
proton K+ S. Anefalos Pereira July 21, 2010 Spin - Praha

11 JLab Accelerator CEBAF
Continuous Electron Beam Energy GeV 200A, polarization 85% Simultaneous delivery to 3Halls CLAS S. Anefalos Pereira July 21, 2010 Spin - Praha

12 to measure exclusive reactions with multi-particle final states
Hall B: Cebaf Large Acceptance Spectrometer Torus magnet 6 superconducting coils beam Electromagnetic calorimeters Lead/scintillator, 1296 photomultipliers Liquid D2 (H2)target +  start counter; e minitorus Broad angular coverage (8°  140° in LAB frame) Charged particle momentum resolution ~0.5% forward dir Drift chambers argon/CO2 gas, 35,000 cells CLAS is designed to measure exclusive reactions with multi-particle final states Time-of-flight counters plastic scintillators, 684 photomultipliers Gas Cherenkov counters e/ separation, 216 PMTs S. Anefalos Pereira July 21, 2010 Spin - Praha

13 Hall B Photon Tagger Jefferson Lab Hall B photon tagger:
Eg = 20-95% of E0 Eg up to ~5.8 GeV dE/E ~10-3 of E0 Flux ~ 108 /s 61 backing counters S. Anefalos Pereira July 21, 2010 Spin - Praha

14 Polarized photon beams
circularly pol. beam (long. pol. Electrons trough carbon)‏ CEBAF electron beam polarization >85% linearly polarized beam (coherent bremsstrahlung on a diamond crystal)‏ Circular polarization Circular polarization from 100% polarized electron beam tagged flux ~ MHz (for k>0.5 E0) ~10 -15MHz (coherent peak)‏ S. Anefalos Pereira July 21, 2010 Spin - Praha

15 Excellent reliability!
FROST FRozen Spin Target (C4H9OH – polarized butanol) with longitudinal and transverse polarization Result Design Polarization % (80%) -85% 1/e relaxation time 2800h (+) (500h) 1600h (-) Entire repolarization procedure takes under 6 hours Take data for 5-6 days Excellent reliability! S. Anefalos Pereira July 21, 2010 Spin - Praha

16 HD-Ice target for polarised neutrons with both photon and
Designed to run with both photon and electron beams New polarized target (H D )   Under construction! 03 – 04/2011 commissioning 04/2011 production running 04 – 05/2011 electron beam test run S. Anefalos Pereira July 21, 2010 Spin - Praha

17 Photoproduction on protons
Unpolarized cross sections Single beam polarization Recoil polarization Double polarization (Beam and Recoil) Circular polarized beam Linear polarized beam Used real photon beam on a LH2 target. Polarized photons produced by Bresstrahlung of polarized Jlab electron beam on gold radiator. Photon energy measured by Hall B photon tagger. Polarization of photon beam a function of incident electron polarization and energy of resulting photon. Electron beam polarization measured with Moller polarimeter and known to be ~65%. Polarization of photon beam calculated by Maximon and Olson relation. S. Anefalos Pereira July 21, 2010 Spin - Praha

18 pK+ Total Cross Sections
 CLAS 06  SAPHIR 04  SAPHIR 98  ABBHM Two bump structure seen CLAS/SAPHIR disagreement Missing resonance? R. Bradford et al. Phys. Rev. C (2006) S. Anefalos Pereira July 21, 2010 Spin - Praha

19 Differential cross section of pK+
full line: full model with additional S11, P13 and D13 resonances dotted line: no S11 resonance dot-dashed line: no P13 resonance dashed line: no D13 resonance Alternative approaches propose other contributions for the resonance-like structure at 1.9 GeV: D13 (Bennhold & Mart) P13 (Nikanov et al.) P11 (Ghent model) KKN bound state (Martinez Torres et al.) A large number of cross section data on k-Lambda and K-Sigma have been published and are being used by various groups for phenomenological analyses. This shows the integrated cross section from CLAS used in a fit by the Bonn-Gatchina group. This group finds significant contributions from a P13(1900) 2* state in the PDG. The strongest constraints however come from the polarization data using a circularly polarized photon beam, as is shown in the graph I have taken from their preprint …. Coupled-channel approach by Julia-Diaz et al. (PRC73,055204) new predicted bound state with a mix of a0(980)N and f0(980)N S. Anefalos Pereira July 21, 2010 Spin - Praha

20 Differential cross section of pK+
 CLAS McCracken 2010  CLAS Bradford 2006  SAPHIR 2004 K d/dcosc.m. (b)  S (GeV) M.E.McCracken et.al., PRC 81, (2010) broader energy range, better statistics, good agreement between CLAS (Bradford et al.) and new CLAS 2010 data set. Different data set, different trigger, different analysis chain S. Anefalos Pereira July 21, 2010 Spin - Praha

21 Differential cross section of pK+
1.62 GeV A large number of cross section data on k-Lambda and K-Sigma have been published and are being used by various groups for phenomenological analyses. This shows the integrated cross section from CLAS used in a fit by the Bonn-Gatchina group. This group finds significant contributions from a P13(1900) 2* state in the PDG. The strongest constraints however come from the polarization data using a circularly polarized photon beam, as is shown in the graph I have taken from their preprint …. 2.84 GeV S. Anefalos Pereira July 21, 2010 Spin - Praha

22 Total cross section of pK+ 0
Single-bump: resonance-like structure near 1.9 GeV N* & D resonances Better agreement with SAPHIR than   CLAS 06  SAPHIR 04  SAPHIR 98  ABBHM R. Bradford et al. Phys. Rev. C (2006) S. Anefalos Pereira July 21, 2010 Spin - Praha

23 Differential cross section of pK+ 0
 CLAS 10  CLAS 06  SAPHIR 04 B. Dey et.al. arXiv: v2 [nucl-ex] submitted to Phys. Rev. C broader energy range, better statistics, good agreement between CLAS (Bradford et al.) and new CLAS data set. Different data set, different trigger, different analysis chain S. Anefalos Pereira July 21, 2010 Spin - Praha

24 Photoproduction on protons
Unpolarized cross sections Single beam polarization Recoil polarization Double polarization (Beam and Recoil) Circular polarized beam Linear polarized beam Used real photon beam on a LH2 target. Polarized photons produced by Bresstrahlung of polarized Jlab electron beam on gold radiator. Photon energy measured by Hall B photon tagger. Polarization of photon beam a function of incident electron polarization and energy of resulting photon. Electron beam polarization measured with Moller polarimeter and known to be ~65%. Polarization of photon beam calculated by Maximon and Olson relation. S. Anefalos Pereira July 21, 2010 Spin - Praha 24

25 PRELIMINARY CLAS g8b improved results - K+
linearly polarized photon asymmetry PRELIMINARY Increase the angular coverage to backward angles Wider range Improved precision Good agreement among CLAS, GRAAL and LEPS Results for gpK+S0 coming as well S. Anefalos Pereira July 21, 2010 Spin - Praha

26 CLAS g8b improved results - K+
linearly polarized photon asymmetry PRELIMINARY Wider range Improved precision Good agreement among CLAS, GRAAL and LEPS Results for gpK+S0 coming as well S. Anefalos Pereira July 21, 2010 Spin - Praha

27 PRELIMINARY CLAS g8b improved results - K+
linearly polarized photon asymmetry PRELIMINARY Increase the angular coverage to backward angles Wider range Improved precision Good agreement among CLAS, GRAAL and LEPS Results for gpK+S0 coming as well S. Anefalos Pereira July 21, 2010 Spin - Praha

28 CLAS g8b improved results - K+
linearly polarized photon asymmetry Increase the angular coverage to backward angles PRELIMINARY Wider range Improved precision Good agreement among CLAS, GRAAL and LEPS Results for gpK+S0 coming as well S. Anefalos Pereira July 21, 2010 Spin - Praha

29 CLAS g8b improved results - K+
linearly polarized photon asymmetry Increase the angular coverage to backward angles PRELIMINARY Wider range Improved precision Good agreement among CLAS, GRAAL and LEPS Results for gpK+S0 coming as well S. Anefalos Pereira July 21, 2010 Spin - Praha

30 Photoproduction on protons
Unpolarized cross sections Single beam polarization Recoil polarization Double polarization (Beam and Recoil) Circular polarized beam Linear polarized beam Used real photon beam on a LH2 target. Polarized photons produced by Bresstrahlung of polarized Jlab electron beam on gold radiator. Photon energy measured by Hall B photon tagger. Polarization of photon beam a function of incident electron polarization and energy of resulting photon. Electron beam polarization measured with Moller polarimeter and known to be ~65%. Polarization of photon beam calculated by Maximon and Olson relation. S. Anefalos Pereira July 21, 2010 Spin - Praha 30

31 pK+ Hyperon Recoil Polarization
GENT Kaon-MAID Regge model GLV R. Bradford et al., Phys. Rev. C 75, (2007). S. Anefalos Pereira July 21, 2010 Spin - Praha

32 pK+ Hyperon Recoil Polarization
 CLAS McCracken  CLAS McNabb 2004  SAPHIR  GRAAL 2007 Wider range Improved precision More detailed structure now visible! CLAS PWA in progress Good agreement among CLAS, SAPHIR and GRAAL S. Anefalos Pereira July 21, 2010 Spin - Praha

33 pK+ Hyperon Recoil Polarization
 CLAS McCracken  CLAS McNabb 2004  SAPHIR  GRAAL 2007 Wider range Improved precision More detailed structure now visible! CLAS PWA in progress Good agreement among CLAS, SAPHIR and GRAAL S. Anefalos Pereira July 21, 2010 Spin - Praha

34 pK+0 Hyperon Recoil Polarization
Wider range Improved precision More detailed structure now visible! CLAS PWA in progress Good agreement among CLAS, SAPHIR and GRAAL S. Anefalos Pereira July 21, 2010 Spin - Praha

35 pK+0 Hyperon Recoil Polarization
Wider range Improved precision More detailed structure now visible! CLAS PWA in progress in three angular bins (0.3, 0.5 and 0.7) there are few isolated discrepancies between CLAS data that is not clear yet. Studies underway. S. Anefalos Pereira July 21, 2010 Spin - Praha

36 Photoproduction on protons
Unpolarized cross sections Single beam polarization Recoil polarization Double polarization (Beam and Recoil) Circular polarized beam Linear polarized beam Used real photon beam on a LH2 target. Polarized photons produced by Bresstrahlung of polarized Jlab electron beam on gold radiator. Photon energy measured by Hall B photon tagger. Polarization of photon beam a function of incident electron polarization and energy of resulting photon. Electron beam polarization measured with Moller polarimeter and known to be ~65%. Polarization of photon beam calculated by Maximon and Olson relation. S. Anefalos Pereira July 21, 2010 Spin - Praha 36

37 Results: Cz for K+ Very large transfer along z
R. Bradford et al., Phys. Rev. C 75, (2007). Results: Cz for K+ Very large transfer along z Poor performance by pre-2007 models Guidal, Laget, Vanderhaeghen Shklyar, Lenske, and Mosel Kaon-MAID Julia-Diaz, Lee, Saghai,Tabakin Corthals, Ryckebusch, and Van Cauteren Sarantsev and Nikonov Janssen, Ryckebusch S. Anefalos Pereira July 21, 2010 Spin - Praha

38 Results: Cx for K+ Poor performance by pre-2007 models
R. Bradford et al., Phys. Rev. C 75, (2007). Results: Cx for K+ Poor performance by pre-2007 models Guidal, Laget, Vanderhaeghen Shklyar, Lenske, and Mosel Kaon-MAID Julia-Diaz, Lee, Saghai,Tabakin Corthals, Ryckebusch, and Van Cauteren Sarantsev and Nikonov Janssen, Ryckebusch S. Anefalos Pereira July 21, 2010 Spin - Praha

39 Effect of including CLAS data in models
gpK+L gpK+L cz cx Nikanov et al’.’s refit of Bonn-Gachina multi- coupled- channel isobar model mix includes: S11-wave, P13(1720), P13(1900), P11(1840) P13(1900) is not found in quark-diquark models. multipole model Kaon-MAID the CLAS data is very important to constraint theoretic models CxCz without N*(1900)P13 CxCz with N*(1900)P13 V. A. Nikanov et al., Phys Lett. B 662, 246 (2008). see also: A.V. Anisovich et al., Eur. Phys J. A (2005). E. Santopinto Phys Rev. C 72, (R), (2005) S. Anefalos Pereira July 21, 2010 Spin - Praha

40 Total polarization for the 
“Fully Polarized L” Confirmed by GRAAL: A. Lleres et al. Eur. Phys. J. A 39, 149 (2009) - No model predicted this CLAS result. - For 0 channel no full polarization has been observed – RΣ0 = 0.82  0.03 S. Anefalos Pereira July 21, 2010 Spin - Praha

41 Photoproduction on protons
Unpolarized cross sections Single beam polarization Recoil polarization Double polarization (Beam and Recoil) Circular polarized beam Linear polarized beam Used real photon beam on a LH2 target. Polarized photons produced by Bresstrahlung of polarized Jlab electron beam on gold radiator. Photon energy measured by Hall B photon tagger. Polarization of photon beam a function of incident electron polarization and energy of resulting photon. Electron beam polarization measured with Moller polarimeter and known to be ~65%. Polarization of photon beam calculated by Maximon and Olson relation. S. Anefalos Pereira July 21, 2010 Spin - Praha 41

42 gpK+L (g8b) Beam-Recoil Ox and Oz
1 -1 KaonMAID; RPR2-Regge only; RPR2-core; RPR2-w/D13 Strong differences to the model predictions. These data will improve model capability. S. Anefalos Pereira July 21, 2010 Spin - Praha

43 gpK+L (g8b) Beam-Recoil Ox and Oz
1 -1 KaonMAID; RPR2-Regge only; RPR2-core; RPR2-w/D13 Strong differences to the model predictions. These data will improve model capability. S. Anefalos Pereira July 21, 2010 Spin - Praha

44 gpK+L (g8b) Beam-Recoil Ox and Oz
1 -1 KaonMAID; RPR2-Regge only; RPR2-core; RPR2-w/D13 Strong differences to the model predictions. These data will improve model capability. S. Anefalos Pereira July 21, 2010 Spin - Praha

45 Photoproduction on neutrons (deuteron target)
neutron channels are almost unexplored add constraints in the resonance extractions. study Final State Interaction: Compare bound proton and free proton results Study YN interactions S. Anefalos Pereira July 21, 2010 Spin - Praha

46 Cross section γ n → K Y data on (LEPS) Eγ = 1.5 – 2.4 GeV
Cos ΘCM = 0.6 – 1.0 γn→K+Σ- (blue points) γp→K+Σ0 (green squares) there is no Total Cross section data for γn reactions S. Anefalos Pereira July 21, 2010 Spin - Praha

47 Neutron experiments @ CLAS
Unpolarized (g10) Final data set with several published papers Target: 24cm liquid deuterium Data taking: March 13 - May 16, 2004 E(g): GeV Integrated luminosity: ~ 50 pb−1 γn (p) → K+ Σ – (p) neutron cross sections Polarized (g13) data process ongoing Target: 40cm liquid deuterium Data taking: October 2006 – June 2007 Circular polarized beam E = 0.4 – 2.5 GeV Linear polarized beam E  = GeV Integrated luminosity: ~ 90 pb−1 n (p)K0 L (p) n (p)K0 S0 (p) neutron cross sections and spin observables n (p) K+* S- (p) n (p) K+* S-* (p) neutron cross sections and beam asymmetry S. Anefalos Pereira July 21, 2010 Spin - Praha

48 γ n(p) → K+ Σ (p) cross sections
 CLAS 2010 LEPS 2006  Regge-3 model first “complete” look at hyperon production off neutron deuteron target (spectator proton) FSI ~ 10% Ghent model with K+ and K*(892) with no resonances S. Anefalos Pereira et. al., Phys.Lett.B 688 (2010) S. Anefalos Pereira July 21, 2010 Spin - Praha

49 γ n(p) → K+ Σ (p) cross sections
 CLAS 2010 LEPS 2006  Regge-3 model first “complete” look at hyperon production off neutron deuteron target (spectator proton) FSI ~ 10% Ghent model with K+ and K*(892) with no resonances Hint of u- channel contribution for higher energies (back angle rise) S. Anefalos Pereira et. al., Phys.Lett.B 688 (2010) S. Anefalos Pereira July 21, 2010 Spin - Praha

50 γ n(p) → K+ Σ (p) cross sections
 CLAS 2010  LEPS 2006 S. Anefalos Pereira et. al., Phys.Lett.B 688 (2010) S. Anefalos Pereira July 21, 2010 Spin - Praha

51 Rescattering study with G13
gp (n) -> K+L0 (n) Russell Johnstone, Glasgow (comparing H2 (g8) and D2 (g13) data) Indicates that quasi-free neutron is a good approximation to a free neutron 1.3 – 1.5 GeV 1.5 – 1.7 GeV 1.1 – 1.3 GeV PRELIMINARY photon asymmetry S ratio (free / quasi-free p) 1.7 – 1.9 GeV 1.9 – 2.1 GeV L0 S0 Cosqcm (-1.0 to +1.0) Free and quasi-free proton Quasi free neutron good approx. to free S. Anefalos Pereira July 21, 2010 Spin - Praha 51

52 PRELIMINARY G13 preliminary beam asymmetry results  n  K0
(Neil Hassal, Glasgow) 1.3 GeV 1.5 GeV 1.7 GeV PRELIMINARY 2.3 GeV 1.9 GeV 2.1 GeV KL KL corrected MAID - P11, P13, S11, D13 MAID - no D13 S. Anefalos Pereira July 21, 2010 Spin - Praha

53 G13 preliminary beam asymmetry results  n  K0 (Neil Hassal, Glasgow)
KS MAID – P11, P13, S11, S31 MAID - P11, P13, P31, S11, S31 MAID – S11, P11, P13 MAID - P11, P13, P31, S11 S. Anefalos Pereira July 21, 2010 Spin - Praha

54 Summary KY photoproduction offer kinematic and analysis advantages in N* physics; CLAS detector provides very precise measurements in a broad kinematic range; Published CLAS KY results on proton (, P, Cx, Cz) have favored a P13(1900) (not P11(1900) or D13(1900)) ; More observables to be published soon (more P; , Ox, Oz); others (G, E, Lx, Lz) are in the analysis pipeline (FROST), and Cross sections results on the neutron in a wide photon energy and angular range has been obtained with CLAS with g10 experiment (more coming in 1-2 years with g13 and HD-Ice). S. Anefalos Pereira July 21, 2010 Spin - Praha

55 THANK YOU !!! S. Anefalos Pereira July 21, 2010 Spin - Praha

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