Chiral dynamics of the S11(1535) and S11(1650) resonances revisited

Bruns, Peter C.; Mai, Maxim; Meißner, Ulf‐G.

doi:10.1063/1.3700538

Cited by 15 publications

(17 citation statements)

References 11 publications

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“…While we have to notice that spin symmetry of three-quark component of S 11 (1650) in the traditional quark model is expected to be the completely symmetric [3] S [43], which should weaken the transition between the three-quark component of S 11 (1650) and the present obtained N ss (1661). In addition, as we can see in Table III, N ss (1661) should couple strongly to ηN and KΛ channels, this is consistent with the large branching ratio of the N * (1535) resonance to ηN channel [31], and the strong coupling of N * (1535) to KΛ channel predicted by isobar model [16] and chiral perturbation theory [22]. One may notice that non-vanishing coupling constant of N * (1650) to KΣ channel was reported in a very recent work [45], while as we can see in Ref.…”

supporting

confidence: 82%

“…Meanwhile, it is claimed that the sea quark-antiquark pairs contribution to properties of nucleon should be significant [13][14][15]. Besides, it is shown that the strangeness components in N * (1535) should account for the mass ordering of N * (1440), N * (1535), and Λ * (1405) [16], and the strong coupling of N * (1535) to the strangeness channels [17][18][19], which are consistent with the predictions of the chiral perturbation theory [20][21][22]. In addition, it is shown that data for the electromagnetic and strong decays of N * (1535) can also be well fitted by taking the strangeness contributions into account [23][24][25].…”

Section: Introductionsupporting

confidence: 68%

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Decay patterns of low-lying Nss¯ states via strangeness channels

An¹,

Xie²,

Li³

2018

Phys. Rev. C

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Here we investigate the decay patterns of the low-lying hidden strangeness nucleon resonances (≡ N ss ) to the strangeness channels by employing the chiral Lagrangian approach, where the N ss states are treated as compact pentaquark states. The S-wave decays of these states to the P B (pseudoscalar meson and baryon) and V B (vector meson and baryon) channels are studied.According to the obtained masses and decay properties, we find four states, namely, N ss (1874) with quantum numbers I(J P ) = 1/2(1/2 − ), N ss (1885) with I(J P ) = 1/2(3/2 − ), N ss (2327) with I(J P ) = 1/2(1/2 − ), and N ss (2252) with I(J P ) = 1/2(3/2 − ), may be associated to the well established nucleon resonances N * (1895), N * (1875), and the newly predicted N * (2355) and N * (2250) by CLAS collaboration, respectively. In addition, several other obtained hidden strangeness nucleon resonances may be expected to be dominant components of the predicted missing resonances in the literatures. * Electronic address: gli@mail.qfnu.edu.cnRecently, triggered by the observation of the P + c pentaquark states, the hidden strange pentaquark states as η ′ N and φN bound states [26], KΣ * and K * Σ bound states [27,28], and compact five-quark states [29] were investigated. In Ref. [30], a possible φp resonance was investigated in the Λ + c → π 0 φp decay by considering a triangle singularity mechanism, where the obtained φp invariant mass distribution agrees with the existing data. It is very

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supporting

confidence: 82%

Section: Introductionsupporting

confidence: 68%

Decay patterns of low-lying Nss¯ states via strangeness channels

An¹,

Xie²,

Li³

2018

Phys. Rev. C

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“…Yet one pole disappeared when the offshell corrections were switched on, and only one Λ(1405) survived. This contradicts [15,33]; in their ansatz, off-shell effects were found to be small and two poles were present. Revai [34,35] suggests that the two-pole structure is a consequence of the on-shell factorization approximation; without this approximation, only one pole was found.…”

Section: Introductionmentioning

confidence: 89%

Hyperon III: $$K^{-}p - \pi \varSigma $$ coupled-channel dynamics in the $$\varLambda (1405)$$ mass region

et al. 2020

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Low-energy data on the three charge states in γ p → K + (Σπ) from CLAS at JLab, on K − p → π 0 π 0 Λ and π 0 π 0 Σ from the Crystal Ball at BNL, bubble chamber data on K − p → π − π + π ± Σ ∓ , low-energy total cross sections on K − induced reactions, and data on the K − p atom are fitted with the BnGa partial-wave-analysis program. We find that the data can be fitted well with just one isoscalar spin-1/2 negative-parity pole, the Λ(1405), and background contributions. In a fit with one isocsalar state, the Λ(1405) structure can be determined as a dominantly SU(3) singlet state. A fit with two isoscalar singlet states, with imposed properties of the low-mass state, is, however, also not incompatible with data.

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“…While this can, a posteriori, deliver an improved description of the transition form factor, questions of how to bring models with hadronic degrees of freedom and quark/gluonic degrees of freedom conceptually together remain a challenge. Methods like chiral unitary approaches use only hadrons as degrees of freedom and have been used to study and predict meson-baryon dynamics [53,54].…”

Section: Pos(hadron2017)010mentioning

confidence: 99%

Phenomenology of baryon resonances

Döring¹,

Landay²,

Mai³

et al. 2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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Results for light baryon spectroscopy by different collaborations and the state of the art in the subfield is reviewed. Highlights contain common efforts of different phenomenology groups and the impact of recent high-precision data from ELSA, JLab, MAMI, and other facilities. Questions will be addressed, on one side, of how to proceed to reach conclusive answers in baryon spectroscopy, and, on the other side, how phenomenology can be connected to theory in a meaningful way.

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Chiral dynamics of the S11(1535) and S11(1650) resonances revisited

Cited by 15 publications

References 11 publications

Decay patterns of low-lying Nss¯ states via strangeness channels

Decay patterns of low-lying Nss¯ states via strangeness channels

Hyperon III: $$K^{-}p - \pi \varSigma $$ coupled-channel dynamics in the $$\varLambda (1405)$$ mass region

Phenomenology of baryon resonances

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