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CLAS Hadron Spectroscopy

CLAS Hadron Spectroscopy. Working Group Meeting Report, CLAS12 2nd European Workshop/ CLAS Collaboration Meeting, March 2011. Analyses Under Working-group Review - 1

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CLAS Hadron Spectroscopy

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  1. CLAS Hadron Spectroscopy Working Group Meeting Report, CLAS12 2nd European Workshop/ CLAS Collaboration Meeting, March 2011

  2. Analyses Under Working-group Review - 1 Measurement of the Lineshape, Differential Photoproduction Cross Section, Spin and Parity of the Lambda(1405) Using CLAS at Jefferson Lab Contact persons: Reinhard Schumacher, Kei MoriyaAnalysis Review Committee: Paul Eugenio (chair), Raffaella De Vita, Mac Mestayer Committee formed November 8, 2010 First round comments; awaiting author response Photoproduction of the phi(1020) with linearly polarized photons from the proton Contact persons: Julian Salamanca and Phil ColeAnalysis Review Committee: Bryan McKinnon (chair), PawelNadel-Turonski, Mike Wood Committee formed June 10, 2010 Second round comments; awaiting author response Differential cross sections and SDME for phi(1020) photoproduction from g11 Contact persons (CMU): BiplabDey and Curtis MeyerContact persons (ODU): HeghineSeradaryan and MoskovAmarianAnalysis Review Committee: Lei Guo (chair), RaffaelllaDeVita, Michael Dugger, Valery Kubarovsky Committee formed July 20, 2010 Awaiting confirmation of consistent results

  3. Analyses Under Working-group Review – 2 Review #4709539: "Photo-production of Σ∗+(1385) with CLAS" (1st round ended on March 4, 2011) Initiated by:David IrelandReview type: AnalysisStatus: Contact author:GagikGavalianExperiment/Working group: g11/HSCommittee: Kenneth Hicks (Chair), Ralf Gothe , Eugene PasyukReview deadline: March 4, 2011 Pending Analyses Reviews Photoproductionof Lambda1520 Hyperon off Protons and Neutrons in Deuterium" with eg3 data. Contact author: ZhiwenZhao Awaiting formation of committee

  4. Ad-Hoc Reviews Review #8061056: "Upper limits for photoproduction cross section for the Φ--(1860) pentaquark state" (1st round ended on January 31, 2011) Initiated by:HovanesEgiyanReview type: Ad-hocStatus:1st round endedContact author:HovanesEgiyanExperiment/Working group: eg3/HSCommittee:Reinhard Schumacher (Chair), Angela Biselli , Gerard GilfoyleReview deadline: January 31, 2011

  5. PAC Proposals Meson Spectroscopy with low Q2 electron scattering in CLAS12 Contact persons: Marco Battaglieri and Raffaella De VitaAnalysis Review Committee: Volker Crede (chair), ChadenDjalili, HovanesEgiyan PAC result: A-

  6. Collaboration-wide review Review #5573944: "Electromagnetic decay of the Sigma*0 to Lambda gamma" (Ended on March 1, 2011) Initiated by:Marco RipaniReview type: Collaboration-wideStatus:EndedContact author:Kenneth HicksExperiment/Working group: g11/HSReview deadline: March 1, 2011

  7. Agenda 14:15 Opening comments - Dave Ireland 14:20Measuring the G polarisation observable for KΛ photoproduction from g9a - Stuart Fegan 14:45Search for Missing Resonances in γp -> K Λ using Circularly Polarized Photons on a Polarized Target - Liam Casey 15:10Electroproduction of hybrid 1-+ mesons - Samuel Wallon 15:35OZI and G-parity violating decays of η' and φ mesons - MoskovAmaryan

  8. Double Polarization Observables in gp→K+L using Circularly Polarized Photons incident on FROST (g9a) Liam Casey Catholic University of America CLAS 12 European Meeting Hadron Spectroscopy Group

  9. Missing Mass M(X) (gp→K+X) Kaon vertex distribution determines the target of event origin. The missing mass off the Kaon can be used to find Λ and Σ signals in both targets.

  10. Consistency – Recoil Polarization 1.4 GeV 1.5 GeV The recoil polarization P shows good agreement with g11 data across most of the energy range. These are typical bins. Here I calculate P in an integrated manner taking the asymmetry in protons falling above and below the reaction plane. Technically, recoil asymmetry from carbon should be subtracted.

  11. G1C to G1C Comparison 1.4 GeV Values of g1c analysis are rotated to primed coordinate system according to the rubric of Sandorfi. 1.5 GeV A. M. Sandorfi et al., arXiv:1010.455v1 [nucl-th] 21 Oct 2010

  12. Helicity Asymmetry E E plotted for the missing D13 relevant 1.5 GeV photon energy bin Solid blue line shows kaon-MAID Model of T. Mart. Dashed orange line is the model of B. Saghai, which includes hyperonic resonances in place of D13 and the dot-dash magenta line is the SAID based PWA of GWU. Dilution calculated by angular bin, PT and Pγ for each kinematic bin.

  13. Polarization Transfer Lx' and Lz' 1.5 GeV 1.5 GeV Lx‘ and Lz’ are calculated in the same manner as the beam-recoil polarization transfer with the target polarization magnitude and direction replacing the beam circular polarization and helicity.

  14. Rare Decays of Light Mesons in CLAS. Preliminary Results. M.Amaryan, G.Gavalian, C.Nepali Old Dominion University Norfolk, VA CLAS Collaboration Meeting Paris, March 10, 2011

  15. Missing Mass π0 η K0 ω We use g11 Data: 3 charged track events identified as a proton and two oppositely charged pions

  16. First Observation of G-Parity Violating Decay of φ Meson η‘ PDG Exp. limit Br<1.8x10-5 f1(1285) Φ M=1.021 GeV σ = 0.005 GeV Theory prediction: Br( ) ~3x10-7 (I.J.M.Phys. A, Vol.7, No. 20(1992), 4825)

  17. OZI Rule Violating Decay of ϕ meson in photoproduction ω ϕ η‘ η‘ ϕ η Very Different from e+e- annihilation!

  18. First Observation of rare EM decay of η meson η’ ω (PDG) η (Not seen before, an upper limit is quoted in PDG.)

  19. Summary Table

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