Chiral dynamics of low-energy kaon-baryon interactions with explicit resonance

Krippa, Boris; Londergan, J. T.

doi:10.1103/physrevc.58.1634

Cited by 13 publications

(5 citation statements)

References 13 publications

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“…We also calculate the coupling strength g i to each channel, which is obtained as the residue of the pole in the effective interaction as in Eq. (31). The values of the couplings are summarized in Table II.…”

Section: Numerical Analysismentioning

confidence: 99%

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Origin of resonances in the chiral unitary approach

Hyodo

Jido

Hosaka³

2008

Phys. Rev. C

221

305

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We study the origin of the resonances associated with pole singularities of the scattering amplitude in the chiral unitary approach. We propose a "natural renormalization" scheme using the low-energy interaction and the general principle of the scattering theory. We develop a method to distinguish dynamically generated resonances from genuine quark states [Castillejo-Dalitz-Dyson (CDD) poles] using the natural renormalization scheme and phenomenological fitting. Analyzing physical meson-baryon scatterings, we find that the Lambda(1405) resonance is largely dominated by the meson-baryon molecule component. In contrast, the N(1535) resonance requires a sizable CDD pole contribution, while the effect of the meson-baryon dynamics is also important.Comment: RevTeX4, 14 pages, 4 figures, 4 tables, title changed by editors, final version to appear in Phys. Rev.

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Section: Numerical Analysismentioning

confidence: 99%

“…In most cases, the CDD pole is introduced explicitly as an elementary field in the chiral perturbation theory [30,31] or in the unitarized framework [29,32,33,34]. There are, however, some cases in which the CDD pole contribution is hidden in the model parameters.…”

Section: Introductionmentioning

confidence: 99%

Origin of resonances in the chiral unitary approach

Hyodo

Jido

Hosaka³

2008

Phys. Rev. C

221

305

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“…It should be pointed out, that the Λ(1405) is generated dynamically in our approach whereas in Refs. [63,64] it is treated as an elementary field.…”

Section: In-medium Transition Ratesmentioning

confidence: 99%

Antikaon production in A+A collisions at SIS energies within an off-shell G-matrix approach

et al. 2003

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The production and propagation of antikaons -described by dynamical spectral functions A h (X, P , M 2 ) as evaluated from a coupled channel G-matrix approachis studied for nucleus-nucleus collisions at SIS energies in comparison to the conventional quasi-particle limit and the available experimental data using off-shell transport theory. We find that the K − spectra for 12 C + 12 C and 58 N i + 58 N i at 1.8 A·GeV remain underestimated in the G-matrix approach as in the on-shell quasiparticle approximation whereas the preliminary spectra for Au + Au at 1.5 A·GeV are well described in both limits. This also holds approximately for the K − rapidity distributions in semi-central collisions of N i + N i at 1.93 A·GeV. However, in all limits considered there is no convincing description of all spectra simultaneously. Our off-shell transport calculations, furthermore, demonstrate that the strongest in-medium effects should be found for low antikaon momenta in the center-of-mass frame, since the deceleration of the antikaons in the attractive Coulomb and nuclear potentials and the propagation to the on-shell mass induces a net shift and squeezing of the K − spectra to the low momentum regime.

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“…, 8) and singlet (e = 0) baryon resonances, with M 9e the mass of the e th nonet member. The flavor coefficients in (12) are,…”

Section: Partial Waves From Nonet-baryon Exchangementioning

confidence: 99%

“…Those limitations of BChPT have motivated the introduction of unitarization techniques to extend its phenomenological scope to higher energies in N π and N K + processes, and to the S = −1 sector. Unitary coupled-channels techniques based on Lippmann-Schwinger or Bethe-Salpeter equations have been succesfully applied to the study of N K and other meson-baryon processes, even at relatively high energies [7][8][9][10][11][12][13][14]. A unitarization method dealing directly with the chiral effective theory T -matrix was introduced in [15,16], drawing elements from the N/D method of [17] and from analogous approaches in the meson sector [18,19].…”

Section: Introductionmentioning

confidence: 99%

Polarized pK- scattering in Unitary Baryon Chiral Perturbation Theory

Bouzas

2010

Eur. Phys. J. A

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We study pK − scattering in the energy range from threshold through the Λ(1520) peak in UBChPT, taking into account O(q) vertices from meson-baryon contact interactions and s-and u-channel groundstate baryon exchange, s-and u-channel decuplet-and nonet-baryon exchange and t-channel vectormeson exchange, as well as O(q 2 ) flavor-breaking vertices. Detailed fits to data are presented, including a substantial body of differential cross-section data with meson momentum q lab > 300 MeV not considered in previous treatments. * E-mail: abouzas@mda.cinvestav.mx 1 O(q n ) denotes a generic quantity of chiral order n, with q a nominally small quantity such as a meson momentum or mass.

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Chiral dynamics of low-energy kaon-baryon interactions with explicit resonance

Cited by 13 publications

References 13 publications

Origin of resonances in the chiral unitary approach

Origin of resonances in the chiral unitary approach

Antikaon production in A+A collisions at SIS energies within an off-shell G-matrix approach

Polarized pK- scattering in Unitary Baryon Chiral Perturbation Theory

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