Speaker
Description
As part of the N* program, the CLAS detector in Hall B was used in a series of photoproduction experiments with the intention of performing a complete and over-determined measurement of the polarisation observables associated with strangeness photoproduction. Although sufficient observables have now been measured to enable the associated reaction amplitudes to be determined, facilitating a near model-independent partial wave analysis, global data in strangeness channels is a couple of orders of magnitude smaller than pion photoproduction, so some ambiguities remain.
These ambiguities can be resolved by measuring observables spanning combinations of beam, target and recoil polarisation, all of which is possible with the CLAS data due to the self-analysing property of the hyperon and experiments involving polarised beams and targets. Studies on strangeness photoproduction reactions may provide evidence of previously undetermined resonances, due to the different coupling strengths of these states to other reaction channels.
This talk will focus on recent measurements of beam-target double polarisation observables on strangeness photoproduction channels being led by the York group on data from the FROST polarised target experiment, outline prospects for measuring target-recoil observables on this data, and highlight the “unfinished business” in strangeness photoproduction that awaits completion.
