Polarization Observables from Strangeness Photoproduction on a Frozen Spin Target at Jefferson Lab
ORAL
Abstract
The FROST experiment at Jefferson Lab used the CLAS detector in Hall B with the intention of performing a complete and over-determined measurement of the polarization observables associated with strangeness photoproduction, in combination with data from previous JLab experiments as part of the N* program. This was achieved by utilizing the FROST polarized target in conjunction with polarized photon beams, allowing direct measurement of beam-target double polarization observables. Sufficient observables have now been measured to enable the associated reaction amplitudes to be determined, facilitating a near model-independent PWA, remaining ambiguities will only be resolved by measuring observables spanning combinations of beam, target, and recoil polarization. With current data on the baryon spectrum dominated by studies of $\pi $N reactions, investigations on strangeness photoproduction reactions, such as $\gamma $p$\to $K$+\Lambda $, may observe previously unseen resonances, due to the different coupling strengths of these states to different reaction channels.The G asymmetry is one of the beam-target double polarization observables, associated with a longitudinally polarized target and a linearly polarized photon beam, and its measurement for the strangeness reaction $\gamma $p$\to $K$+\Lambda $ in the energy range E$\gamma \quad =$ 1.1 -- 2.1 GeV is the focus of the work presented.
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Authors
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Igor Strakovsky
GWU
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Stuart Fegan
George Washington Univ, George Washington University