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We estimate the valence quark contributions for the gamma* Y -> Lambda*(Y=Lambda, Sigma0) electromagnetic transition form factors. We focusparticularly on the case Lambda*=Lambda(1670) as an analog reaction with gamma*N -> N(1535). The results are compared with those obtained from chiral unitarymodel, where the Lambda* resonance is dynamically generated and thus theelectromagnetic structure comes directly from the meson cloud excitation of thebaryon ground states. The form factors for the case Y=Sigma0 in particular,depend crucially on the two real phase (sign) combination, a phase between theLambda and Lambda* states, and the other, the phase between the Lambda andSigma0 radial wave functions. Depending on the combination of these two phases,the form factors for the gamma* Sigma0 -> Lambda* reaction can be enhanced orsuppressed. Therefore, there is a possibility to determine the phasecombination by experiments.

Valence quark and meson cloud contributions for the gamma* Lambda -> Lambda* and gamma* Sigma0 -> Lambda* reactions