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https://hdl.handle.net/2440/74167
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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 1550-2368 |
Statement of Responsibility: | 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 |
DOI: | 10.1103/PhysRevD.85.093014 |
Grant ID: | http://purl.org/au-research/grants/arc/FL0992247 22740161 22105507 |
Published version: | http://dx.doi.org/10.1103/physrevd.85.093014 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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hdl_74167.pdf | Published version | 1.38 MB | Adobe PDF | View/Open |
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