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| Home > Workflow collections > Public records > The Radiative decay of the Lambda(1405) and its two-pole structure |
| Journal Article | PreJuSER-60498 |
; ;
2007
Springer
Berlin
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Please use a persistent id in citations: http://hdl.handle.net/2128/10526 doi:10.1140/epja/i2007-10371-0
Abstract: We evaluate theoretically the radiative decay widths into gamma Lambda and gamma Sigma(0) of the two poles' of the A(1405) found in chiral unitary theories and we find quite different results for each of the two poles. We show that, depending on which reaction is used to measure the A(1405) radiative decays, one gives more weight to one or the other pole, resulting in quite different shapes in the gamma Lambda(Sigma(0)) invariant-mass distributions. Our results for the high-energy pole agree with those of the empirical determination of the gamma Lambda and gamma Sigma(0) radiative widths (based on an isobar model fitting of the K-p atom data), which are sometimes referred to as "experimental data". We have made a detailed study of the K(-)p -> pi(0)gamma Lambda(Sigma(0)) and pi(-)rho -> K-0 gamma Lambda(Sigma(0)) reactions and have shown that they, indeed, lead to different shapes for the -yA(ZO) invariant-mass distributions.
Keyword(s): K- p: inelastic scattering ; pi- p: inelastic scattering ; hyperon: hadroproduction ; Lambda(1405): hadroproduction ; Lambda(1405): radiative decay ; Sigma0 ; mass spectrum: (Lambda photon) ; mass spectrum: (Sigma0 photon) ; Lambda(1405): width ; approximation: pole ; perturbation theory: chiral ; numerical calculations ; Lambda(1405) --> Lambda photon ; Lambda(1405) --> Sigma0 photon ; K- p --> Lambda pi0 photon ; K- p --> Sigma0 pi0 photon ; pi- p --> Lambda K0 photon ; pi- p --> Sigma0 K0 photon
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