Photoproduction of Λ and Σ0 hyperons using linearly polarized photons

CLAS Collaboration

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Background: Measurements of polarization observables for the reactions γ - p→K+Λ and γ - p→K+Σ0 have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and nuclear systems. Beam-recoil observables for the γ - p→K+Σ0 reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams incident on a liquid hydrogen target, and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71<W<2.19GeV, with an angular range -0.75<cosθK <+0.85. Results: The observables extracted for both reactions are beam asymmetry Σ, target asymmetry T, and the beam-recoil double polarization observables Ox and Oz. Conclusions: Comparison with theoretical fits indicates that, in the regions where no previous data existed, the new data contain significant new information, and strengthen the evidence for the set of resonances used in the latest Bonn-Gatchina fit.

Original languageEnglish (US)
Article number065201
JournalPhysical Review C - Nuclear Physics
Volume93
Issue number6
DOIs
StatePublished - Jun 8 2016

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hyperons
photoproduction
photons
polarization
asymmetry
baryon resonance
liquid hydrogen
strangeness
photon beams
accelerators
quantum chromodynamics
detectors
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Photoproduction of Λ and Σ0 hyperons using linearly polarized photons. / CLAS Collaboration.

In: Physical Review C - Nuclear Physics, Vol. 93, No. 6, 065201, 08.06.2016.

Research output: Contribution to journalArticle

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abstract = "Background: Measurements of polarization observables for the reactions γ - p→K+Λ and γ - p→K+Σ0 have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and nuclear systems. Beam-recoil observables for the γ - p→K+Σ0 reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams incident on a liquid hydrogen target, and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71<W<2.19GeV, with an angular range -0.75",
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AU - Paterson, C. A.

AU - Ireland, D. G.

AU - Livingston, K.

AU - McKinnon, B.

AU - Adhikari, K. P.

AU - Adikaram, D.

AU - Akbar, Z.

AU - Amaryan, M.

AU - Anefalos Pereira, S.

AU - Badui, R. A.

AU - Ball, J.

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AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Biselli, A.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clark, L.

AU - Colaneri, L.

AU - Cole, P. L.

AU - Compton, N.

AU - Contalbrigo, M.

AU - Cortes, O.

AU - Crede, V.

AU - D'Angelo, A.

AU - De Vita, R.

AU - Deur, A.

AU - Djalali, C.

AU - Dugger, Michael

AU - Dupre, R.

AU - Egiyan, H.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Fanchini, E.

AU - Fedotov, G.

AU - Filippi, A.

AU - Fleming, J. A.

AU - Gevorgyan, N.

AU - Ghandilyan, Y.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girod, F. X.

AU - Glazier, D. I.

AU - Gleason, C.

AU - Ritchie, Barry

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