Physics at ELSA

Schmieden, H.; Crystal-Barrel,

doi:10.1007/978-3-540-85144-8_3

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…In closing, it is encouraging to note that experimental work at CLAS [8], Crystal Barrel/TAPS at Bonn [9], and GRAAL [16] is underway to measure additional spin observables in hyperon photoproduction and related reactions in pseudoscalar meson photoproduction. Therefore, progress in unraveling the amplitude-level structure of these reactions can be expected.…”

Section: Further Discussion and Conclusionmentioning

confidence: 99%

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Polarization in hyperon photo- and electro-production⋆

Schumacher

2008

Eur. Phys. J. A

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Multiple polarization observables must be measured to access the amplitude structure of pseudoscalar meson photoproduction off the proton. The hyperon-producing reactions are especially attractive to study, since the weak decays allow straightforward measurement of the induced and recoil polarization observables. In this paper we emphasize γ + p → K + + Λ, discussing recent measurements of Cx, Cz, and P for this reaction. An empirical constraint on the helicity amplitudes is obtained. A simplified model involving spin-flip and spin non-flip amplitudes is presented. Finally, a semi-classical model of how the polarization may arise is presented. PACS. 25.20.Lj Photoproduction reactions -13.40.-f Electromagnetic processes and properties -13.60.Le Meson production -13.60.-r Photon and charged lepton interactions with hadrons

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Section: Further Discussion and Conclusionmentioning

confidence: 99%

“…In this paper we will discuss some implications of these observations for other observables that have been measured already at GRAAL [6], and LEPS [7], or which are due to be measured at CLAS [8] or ELSA [9]. We begin with a brief review of the formalism that defined the observables in a helicity basis.…”

Section: Introductionmentioning

confidence: 99%