Chiral Dynamics of the Two Λ(1405) States
نویسنده
چکیده
D. JIDO, J.A. OLLER, E. OSET, A. RAMOS AND U.-G. MEIßNER ECT, Villa Tambosi, Strada delle Tabarelle 286, I-38050 Villazzano, Italy Departamento de F́ısica, Universidad de Murcia, 30071 Murcia, Spain Departamento de F́ısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Aptd. 22085, 46071 Valencia, Spain Departament d’Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain 5 HISKP, University of Bonn, Nußalle 14-16, D-53115 Bonn, Germany
منابع مشابه
Chiral Dynamics, Structure of Λ(1405), and K̄n Phenomenology
We investigate the structure of the Λ(1405) resonance and K̄N phenomenology in the perspective of chiral SU(3) dynamics. Utilizing the chiral coupled-channel approach which well describes the K̄N scattering observable, we perform three different analyses to clarify the structure of the Λ(1405) resonance. The results consistently indicate the meson-baryon molecule picture of the Λ(1405). We argue ...
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The K − p → π 0 π 0 Σ 0 reaction is studied within a chiral unitary model. The distribution of π 0 Σ 0 states forming the Λ(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of Γ = 38 MeV. We use these data in combination with those of the π − p → K 0 πΣ reaction and elements of chiral unitary theory to prove that there are two Λ(1405) states i...
متن کاملStructure of Λ ( 1405 ) and chiral dynamics ∗
We report on a recent theoretical work on the structure of the Λ(1405) resonance within a chiral unitary approach, in which the resonance is dynamically generated in meson-baryon scattering. Studying the analytic structure of the scattering amplitude, we have found that there are two poles lying around energies of Λ(1405) with different widths and couplings to the meson-baryon states. We discus...
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The electric mean squared radii 〈r〉E of Λ(1405) are calculated in the chiral unitary model. We describe the Λ(1405) as a dynamically generated resonance fully in the octet meson and octet baryon scattering. We also consider “Λ(1405)” as a bound state of K̄N . For the later “Λ(1405),” we obtain negative and larger absolute value of electric mean squared radius than that of ordinary baryons, which...
متن کاملar X iv : n uc l - th / 0 30 30 62 v 1 2 5 M ar 2 00 3 Chiral dynamics of the two Λ ( 1405 ) states
Using a chiral unitary approach for the meson–baryon interactions, we show that two octets of J π = 1/2 − baryon states, which are degenerate in the limit of exact SU(3) symmetry, and a singlet are generated dynamically. The SU(3) breaking produces the splitting of the two octets, resulting in the case of strangeness S = −1 in two poles of the scattering matrix close to the nominal Λ(1405) reso...
متن کاملar X iv : h ep - p h / 05 10 12 2 v 1 1 0 O ct 2 00 5 Two pole structure of the Λ ( 1405 ) resonance
The Kp → ππΣ reaction is studied within a chiral unitary model. The distribution of πΣ states forming the Λ(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of Γ = 38 MeV. This reaction gives maximal possible weight to the second Λ(1405) state found in chiral unitary theories, which is narrow and of higher energy than the nominal Λ(1405). In c...
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