Kaon-nucleon scattering in an extended cloudy bag model

We calculate the shape of the and invariant mass distributions in the and decays that are dominated by the resonance. The weak interaction part is the same for both processes and the hadronization into the different meson–baryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the meson–baryon final-state interaction using two chiral unitary models from different theoretical groups. Both approaches give a good description of antikaon–nucleon scattering data, the complex energy shift in kaonic hydrogen and the line shapes of in photoproduction, based on the two-pole scenario for the . We find that this reaction reflects more the higher mass pole and we make predictions of the line shapes and relative strength of the meson–baryon distributions in the final state.

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“…This view has also been invoked in Ref. [32]. However, it was with the advent of chiral unitary theory that this idea gained strength [33–47].…”

Section: Introductionmentioning

confidence: 96%

Predictions for the $${\varvec{\Lambda }_b \rightarrow J/\psi ~ \Lambda (1405)}$$ Λ b → J / ψ Λ ( 1405 ) decay

Roca

Mai²,

Oset

et al. 2015

Eur. Phys. J. C

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“…Very early it was already postulated that it could be a resonance made from the interaction of the coupled channelsKN and πΣ [1,2]. Other works followed, looking at theKN interaction from other perspective [3]. A big step forward was made possible with the use of chiral dynamics in its unitarized form, the so called chiral unitary approach, which has brought a new perspective to the problem and has shown the importance of coupled channels and unitarity [4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Λ(1405)poles obtained fromπ0Σ0photoproduction data

2013

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We present a strategy to extract the position of the two Λ(1405) poles from experimental photoproduction data measured recently at different energies in the γp → K + π 0 Σ 0 reaction at Jefferson Lab. By means of a chiral dynamics motivated potential but with free parameters, we solve the Bethe Salpeter equation in the coupled channelsKN and πΣ in isospin I=0 and parameterize the amplitude for the photonuclear reaction in terms of a linear combination of the πΣ → πΣ and KN → πΣ scattering amplitudes in I=0, with a different linear combination for each energy. Good fits to the data are obtained with some sets of parameters, by means of which one can also predict the cross section for the K − p → π 0 Σ 0 reaction. These later results help us decide among the possible solutions. The result is that the different solutions lead to two poles similar to those found in the chiral unitary approach. With the best result we find the two Λ(1405) poles at 1385 − 68i MeV and 1419 − 22i MeV.

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“…In addition, one needs a good scattering amplitude to be implemented in this equation. The study of strangeness −1 has a long history [5,6,7,8,9,10,11,12] within K-matrix models, dispersion relations, meson-exchange models, quark models, cloudy bag-models or large N c QCD, just to quote a few. However, in more recent years it has received a lot of attention from the application of SU(3) baryon Chiral Perturbation Theory (CHPT) to this sector together with a unitarization procedure, see e.g., [13,14,15,16,17,18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

On the strangeness -1 S-wave meson-baryon scattering

2006

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We consider meson-baryon interactions in S-wave with strangeness −1. This is a nonperturbative sector populated by plenty of resonances interacting in several two-body coupled channels. We study this sector combining a large set of experimental data. The recent experiments are remarkably accurate demanding a sound theoretical description to account for all the data. We employ unitary chiral perturbation theory up to and including O(p 2 ) to accomplish this aim. The spectroscopy of our solutions is studied within this approach, discussing the rise from the pole content of the two Λ(1405) resonances and

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Kaon-nucleon scattering in an extended cloudy bag model

Cited by 76 publications

References 14 publications

Predictions for the $${\varvec{\Lambda }_b \rightarrow J/\psi ~ \Lambda (1405)}$$ Λ b → J / ψ Λ ( 1405 ) decay

Predictions for the $${\varvec{\Lambda }_b \rightarrow J/\psi ~ \Lambda (1405)}$$ Λ b → J / ψ Λ ( 1405 ) decay

Λ(1405)poles obtained fromπ0Σ0photoproduction data

On the strangeness -1 S-wave meson-baryon scattering

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