Valence quark and meson cloud contributions for the γ*Λ→Λ* and γ*Σ⁰→Λ* reactions
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2012
Authors
Ramalho, G.
Jido, D.
Tsushima, K.
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Physical Review D: Particles, Fields, Gravitation and Cosmology, 2012; 85(9):1-17
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G. Ramalho, D. Jido, and K. Tsushima
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Abstract
We estimate the valence quark contributions for the γ*Y→Λ* (Y=Λ, Σ0) electromagnetic transition form factors. We focus particularly on the case of Λ*=Λ(1670) as an analogue reaction with γ*N→N(1535). The results are compared with those obtained from chiral unitary model, where the Λ* resonance is dynamically generated and thus the electromagnetic structure comes directly from the meson cloud excitation of the baryon ground states. The form factors for the case Y=Σ0 in particular, depend crucially on the two real phase (sign) combination, a phase between the Λ and Λ* states, and the other, the phase between the Λ and Σ0 radial wave functions. Depending on the combination of these two phases, the form factors for the γ*Σ0→Λ* reaction can be enhanced or suppressed. Therefore, there is a possibility to determine the phase combination by experiments.
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© 2012 American Physical Society