The radiative decay of the $Λ(1405)$ and its two-pole structure

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dc.creatorGeng, L. S.
dc.creatorOset, E.
dc.creatorDoring, M.
dc.date2007-02-08
dc.date2007-05-18
dc.date.accessioned2026-07-07T11:59:02Z
dc.date.available2026-07-07T11:59:02Z
dc.descriptionWe evaluate theoretically the radiative decay widths into $γΛ$ and $γΣ^0$ of the two poles of the $Λ(1405)$ 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 $Λ(1405)$ radiative decays, one gives more weight to one or the other pole, resulting in quite different shapes in the $γΛ(Σ^0)$ invariant mass distributions. Our results for the high-energy pole agree with those of the empirical determination of the $γΛ$ and $γΣ^0$ 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 $K^-p\toπ^0γΛ(Σ^0)$ and $π^-p\to K^0γΛ(Σ^0)$ reactions and have shown that they, indeed, lead to different shapes for the $γΛ(Σ^0)$ invariant mass distributions.
dc.descriptionVersion to appear in European Physical Journal A; a brief description of the chiral unitary coupled-channel approach added
dc.identifierhttps://arxiv.org/abs/hep-ph/0702093
dc.identifierhttp://arxiv.org/abs/hep-ph/0702093
dc.identifierEur.Phys.J.A32:201-211,2007
dc.identifierdoi:10.1140/epja/i2007-10371-0
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206428
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe radiative decay of the $Λ(1405)$ and its two-pole structure
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