Photoproduction of Λ* Resonances Using the CLAS Detector

Much is known about the photoproduction of the hyperon resonances Λ(1405)1/2^- and Λ(1520)3/2^-, but little is known about photoproduction of the higher-mass resonances Λ(1670)1/2^- and Λ(1690)3/2^-.  Both pairs of resonances are spin-orbit partners and are rated as 4-star (well-known) by the Particle Data Group. In the quark model, the Λ(1405)

and Λ(1520) resonances are assigned to the SU(3) singlet, whereas the Λ(1670) and Λ(1690) are assigned to the octet. Using photoproduction data from the CLAS detector at Jefferson Lab, the Λ(1520) has been studied using two exclusive channels, Σ⁺π^- and Σ^-π⁺, from the detected K⁺, π⁺, and π^- particles. The cross-sections for the higher mass resonances, Λ(1670) and Λ(1690), are studied for the first time using photoproduction.