Strangeness exchange in the photoproduction ofK + Λ(1520) between 2.8 and 4.8 GeV

Differential photoproduction cross sections of theΣ0(1385),Λ(1405), andMoriya1, Schumacher2, Adhikari3 et al. 2013Phys. Rev. C

“…However, the K * exchange models are more consistent with the results at higher photon energies (Ref. [12]). The beam asymmetry for the Λ(1520) was found to be small, much smaller than for the ground state Λ, supporting the contact-term model that found K * exchange is not important in the threshold region.…”

“…11, where the red solid curve comes closest to the Ref. [12] data set but is significantly higher than the new CLAS results. This model overestimates the cross section and lacks sufficient strength at large angles.…”

“…Note that this model was developed to match the scant higher energy data from Ref. [12]. This is seen in Fig.…”

“…For photoproduction of the Λ(1520) there are previous experimental data from Boyarski et al (SLAC) [11] at E γ = 11 GeV and Barber et al (LAMP2, Daresbury) [12] at E γ = 2.8 − 4.8 GeV. In more recent times, the LEPS Collaboration has looked at photoproduction of this hyperon in the energy region 1.9 < E γ < 2.8 GeV using a forward-angle spectrometer [13,14].…”

“…In an effective Lagrangian approach, using Born terms and a Rarita-Schwinger formalism for inclusion of the spin-3/2 Λ(1520), they tested various model assumptions against scant previous data [12] for the total cross section and the t-dependence at E γ = 3.8 GeV. They found that the total cross section near threshold was mainly determined by the contact interaction included in order to preserve gauge invariance in the presence of hadronic form factors.…”