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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Working Group Meeting Report,
CLAS12 2nd European Workshop/
CLAS Collaboration Meeting,
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
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
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
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-
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
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
Catholic University of America
CLAS 12 European Meeting
Hadron Spectroscopy Group
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.
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.
Values of g1c analysis are rotated to primed coordinate system according to the rubric of Sandorfi.
A. M. Sandorfi et al., arXiv:1010.455v1 [nucl-th] 21 Oct 2010
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.
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.
M.Amaryan, G.Gavalian, C.Nepali
Old Dominion University
CLAS Collaboration Meeting
Paris, March 10, 2011
We use g11 Data:
3 charged track events identified as a proton and two oppositely charged pions
Violating Decay of φ Meson
PDG Exp. limit Br<1.8x10-5
σ = 0.005 GeV
Br( ) ~3x10-7
(I.J.M.Phys. A, Vol.7, No. 20(1992), 4825)
of ϕ meson in photoproduction
Very Different from e+e-
(Not seen before,
an upper limit is quoted