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Type: Journal article
Title: Valence quark and meson cloud contributions for the γ*Λ→Λ* and γ*Σ⁰→Λ* reactions
Other Titles: Valence quark and meson cloud contributions for the gamma*lambda ->lambda* and gamma*sigma(0)->lambda* reactions
Author: Ramalho, G.
Jido, D.
Tsushima, K.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2012; 85(9):1-17
Publisher: American Physical Soc
Issue Date: 2012
ISSN: 1550-7998
Statement of
G. Ramalho, D. Jido, and K. Tsushima
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.
Rights: © 2012 American Physical Society
RMID: 0020119445
DOI: 10.1103/PhysRevD.85.093014
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Appears in Collections:Physics publications

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