A new resonance in K+Lambda electroproduction: the D_{13}(1895) and its electromagnetic form factors

Details A new resonance in K+Lambda electroproduction: the D_{13}(1895) and its electromagnetic form factors A new resonance in K+Lambda electroproduction: the D_{13}(1895) and its electromagnetic form factors

1999-09-10

arxiv.org/abs/nucl-th/9909022v1

Physics

Nuclear Physics

Nuclear Theory

10 pages, 7 eps-figures, invited talk at the 2nd ICTP International Conference on Perspectives in Hadronic Physics, Trieste, I

Scientific paper

New SAPHIR p(gamma,K+)Lambda total cross section data show a resonance structure at a total c.m. energy around 1900 MeV. We investigate this feature with an isobar model and find that the structure can be well explained by including a new D_{13} resonance at 1895 MeV. Such a state has been predicted by a relativistic quark model at 1960 MeV with significant gamma-N and K-Lambda branching ratios. We demonstrate how the measurement of single and double polarization observables can be used to obtain additional information on this resonance. Using recent (e,e'K+) JLab data from Hall C we extract the electromagnetic form factors of this state.

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