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

Oller, J. A.

doi:10.1140/epja/i2006-10011-3

Cited by 160 publications

(230 citation statements)

References 82 publications

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“…However, this difference might also be due, in part or to a good extent, to the fact that so far the equations in SCCM have been driven only by the T-W vector interaction without any additional ones such as the attractive KN -term in the diagonalKN channel present in NMFA. Recently, there have been several works on the improved coupledKN equations in free space which incorporate the next-to-leading-order interactions, including the corresponding scalar-isoscalar (or KN term) contribution [37][38][39][40]. Such additional terms have certainly improved the fit to available data by ≈20% thanks to several additional parameters related to them.…”

Section: Sccmmentioning

confidence: 99%

Dmesons in nuclear matter: ADNcoupled-channel equations approach

2006

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A set of coupled two-body scattering equations is solved for the DN system embedded in an isosymmetric nuclear matter. The in-medium behavior of charmed D mesons, (D + , D 0 ), is investigated from the self-consistent solution within this scheme. The effective meson-baryon Lagrangian in charm quantum number one sector, the key ingredient in the present study, is adopted from a recent model by Hofmann and Lutz that has aimed at combining the charmed meson degree of freedom in a consistent manner with chiral unitary models. After a critical examination, the original model is modified in several important aspects, such as the method of regularization, to be more consistent and practical for our objective. The resultant interaction is used to reproduce the position and width of the s-wave c (2593) resonance in the isospin zero DN channel. In the isospin one channel, it generates a rather wide resonance at ∼2770 MeV. The corresponding in-medium solution is then sought by incorporating Pauli blocking and the D-and π -meson dressing self-consistently. At normal nuclear matter density, the resultant c (2593) is found to stay narrow and shifted at a lower energy, whereas the I = 1 resonance is lowered in position as well and broadened considerably.

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Section: Sccmmentioning

confidence: 99%

Dmesons in nuclear matter: ADNcoupled-channel equations approach

2006

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“…The interaction of antikaon (K) with nucleon (N ) has drawn attention for decades [1][2][3][4][5][6][7][8][9][10][11] since this interaction provides essential elements to understand the strangeness in nuclear hadron physics. TheKN interaction is strongly attractive in the isospin I = 0 and also the πΣ interaction is attractive at low energies.…”

Section: Introductionmentioning

confidence: 99%

K¯NNabsorption within the framework of the fixed-center approximation to Faddeev equations

Bayar

Oset

2013

Phys. Rev. C

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We present a method to evaluate theK absorption width in the boundKN N system. Most calculations of this system ignore this channel and only consider theKN → πΣ conversion. Other works make a qualitative calculation using perturbative methods. Since the Λ(1405) resonance is playing a role in the process, the same resonance is changed by the presence of the absorption channels and we find that a full nonperturbative calculation is called for, which we present here. We employ the Fixed Center Approximation to Faddeev equations to account forK rescattering on the (N N ) cluster and we find that the width of the states found previously for S = 0 and S = 1 increases by about 30 MeV due to theKN N absorption, to a total width of about 80 MeV.

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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]. 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 [2][3][4][5][6][7][8][9][10][11]. One of the novel aspects of these works has been the finding of two poles, and thus two states, rather than one, associated to the experimental peaks of the Λ(1405) resonance.…”

Section: Introductionmentioning

confidence: 99%

The two Λ(1405) poles from photoproduction data

Oset

Roca

2015

EPJ Web of Conferences

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Abstract. We present results extracting 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 and γp → K + π ± Σ ∓ reactions at Jefferson Lab. The analysis is done by means of a chiral dynamics motivated potential but with free parameters, which guarantees analyticity and unitarity in the solutions. With the best result we find the two Λ(1405) poles at about 1352 − 48i MeV and 1419 − 29i MeV.

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

Cited by 160 publications

References 82 publications

Dmesons in nuclear matter: ADNcoupled-channel equations approach

Dmesons in nuclear matter: ADNcoupled-channel equations approach

K¯NNabsorption within the framework of the fixed-center approximation to Faddeev equations

The two Λ(1405) poles from photoproduction data

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