S- and p-wave structure of S = −1 meson–baryon scattering in the resonance region

Sadasivan, Daniel; Mai, Maxim; Döring, Michael

doi:10.1016/j.physletb.2018.12.035

Cited by 25 publications

(29 citation statements)

References 62 publications

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“…The contents of this chapter coincides to a large part with the work of Ref. [107]. All authors of Ref.…”

Section: Sand P -Wave Structure Of S = −1 Meson-baryon Scattering In supporting

confidence: 70%

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Sadasivan

2020

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“…The contents of this chapter coincides to a large part with the work of Ref. [107]. All authors of Ref.…”

Section: Sand P -Wave Structure Of S = −1 Meson-baryon Scattering In supporting

confidence: 70%

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Sadasivan

2020

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“…For the status of such measurements, see [64]. Further progress has also been made by including the P-waves and performing a sophisticated error analysis [65], confirming again and sharpening further the two-pole scenario of the Λ(1405) (note that the P-waves had already been included earlier with a focus on the S = 0 sector [66]). Despite these remaining uncertainties, it must be stated clearly that the two-pole nature of the Λ(1405) is established!…”

Section: Where Do We Stand?mentioning

confidence: 74%

Two-Pole Structures in QCD: Facts, Not Fantasy!

Meißner

2020

Symmetry

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The two-pole structure refers to the fact that particular single states in the spectrum as listed in the PDG tables are often two states. The story began with the Λ ( 1405 ) , when in 2001, using unitarized chiral perturbation theory, it was observed that there are two poles in the complex plane, one close to the K ¯ p and the other close to the π Σ threshold. This was later understood combining the SU(3) limit and group-theoretical arguments. Different unitarization approaches that all lead to the two-pole structure have been considered in the mean time, showing some spread in the pole positions. This fact is now part of the PDG book, although it is not yet listed in the summary tables. Here, I discuss the open ends and critically review approaches that cannot deal with this issue. In the meson sector, some excited charm mesons are good candidates for such a two-pole structure. Next, I consider in detail the D 0 * ( 2300 ) , which is another candidate for this scenario. Combining lattice QCD with chiral unitary approaches in the finite volume, the precise data of the Hadron Spectrum Collaboration for coupled-channel D π , D η , D s K ¯ scattering in the isospin I = 1 / 2 channel indeed reveal its two-pole structure. Further states in the heavy meson sector with I = 1 / 2 exhibiting this phenomenon are predicted, especially in the beauty meson sector. I also discuss the relation of these two-pole structures and the possible molecular nature of the states under consideration.

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“…These findings were corroborated by a later study [39] that followed similar ideas. The recent work of Reference [40] obtains the s-and p-wave scattering amplitudes from the leading-order (LO) and NLO Lagrangians, the parameters of which are fitted to the low-energy data, also including the invariant πΣ mass distributions from photo-production reactions at CLAS [17]. A dynamically generated p-wave state with isospin one and J P = 1/2 + is found in that study, which in fact mimics the absence of the Σ * (1385) resonance that plays a relevant role in the πΣ distributions.…”

Section: Introductionmentioning

confidence: 99%

The K¯N Interaction in Higher Partial Waves

et al. 2021

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We present a chiral K¯N interaction model that has been developed and optimized in order to account for the experimental data of inelastic K¯N reaction channels that open at higher energies. In particular, we study the effect of the higher partial waves, which originate directly from the chiral Lagrangian, as they could supersede the role of high-spin resonances employed in earlier phenomenological models to describe meson-baryon cross sections in the 2 GeV region. We present a detailed derivation of the partial wave amplitudes that emerge from the chiral SU(3) meson-baryon Lagrangian up to the d-waves and next-to-leading order in the chiral expansion. We implement a nonperturbative unitarization in coupled channels and optimize the model parameters to a large pool of experimental data in the relevant energy range where these new contributions are expected to be important. The obtained results are encouraging. They indicate the ability of the chiral higher partial waves to extend the description of the scattering data to higher energies and to account for structures in the reaction cross-sections that cannot be accommodated by theoretical models limited to the s-waves.

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S- and p-wave structure of S = −1 meson–baryon scattering in the resonance region

Cited by 25 publications

References 62 publications

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Two-Pole Structures in QCD: Facts, Not Fantasy!

The K¯N Interaction in Higher Partial Waves

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S- and p-wave structure of S = −1 meson–baryon scattering in the resonance region

Cited by 25 publications

References 62 publications

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Unitary Bethe-Salpeter Methods in Two- and Three-Body Systems

Two-Pole Structures in QCD: Facts, Not Fantasy!

The K¯N Interaction in Higher Partial Waves

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Product

Resources

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S- and p-wave structure of S = −1 meson–baryon scattering in the resonance region