Status of some P-wave baryon resonances and importance of inelastic channels

Burkert, Volker D.; Kamano, Hiroyuki; Klempt, Eberhard; Ronchen, Deborah; Sarantsev, Andrey V.; Sato, Toru; Svarc, Alfred; Tiator, Lothar; Workman, Ron L.

doi:10.48550/arxiv.1412.0241

Cited by 3 publications

(5 citation statements)

References 34 publications

(57 reference statements)

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“…The multipole amplitude of the photoproduction process is given by (11) where the index γ denotes the initial γN state. T µκ is the hadronic half-off-shell T -matrix introduced in Sec.…”

Section: B Photon-induced Reactionsmentioning

confidence: 99%

“…In the past, the dominant source of information on resonance properties was provided by elastic πN scattering [7][8][9]. The analysis of inelastic reactions is, however, essential [10,11] when aiming at a reliable extraction of the entire spectrum and, consequently, at an identification of missing states that might couple predominantly to channels other than πN .…”

Section: Introductionmentioning

confidence: 99%

“…For example, some states like the four-star N (1535)1/2 − resonance are known to have a large ηN branching ratio. Less well-established resonances like the N (1710)1/2 + , whose parameters are only weakly constrained from elastic πN scattering [9,[11][12][13], may show a noticeable signal in their ηN decay [10,11]. A narrow structure discovered in eta photoproduction on the neutron [14][15][16] at around E = 1.68 GeV could also appear in eta production on the proton target.…”

Section: Introductionmentioning

confidence: 99%

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Eta photoproduction in a combined analysis of pion- and photon-induced reactions

et al. 2015

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The ηN final state is isospin-selective and thus provides access to the spectrum of excited nucleons without being affected by excited ∆ states. To this end, the world database on eta photoproduction off the proton up to a center-of-mass energy of E ∼ 2.3 GeV is analyzed, including data on differential cross sections, and single and double polarization observables. The resonance spectrum and its properties are determined in a combined analysis of eta and pion photoproduction off the proton together with the reactions πN → πN , ηN , KΛ and KΣ. For the analysis, the so-called Jülich coupled-channel framework is used, incorporating unitarity, analyticity, and effective three-body channels. Parameters tied to photoproduction and hadronic interactions are varied simultaneously. The influence of recent MAMI T and F asymmetry data on the eta photoproduction amplitude is discussed in detail.

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Section: B Photon-induced Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eta photoproduction in a combined analysis of pion- and photon-induced reactions

et al. 2015

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“…There are as well four isolated positive-parity nucleon resonances: N (1880)1/2 + , N (1900)3/2 + , N (2000)5/2 + , N (1990)7/2 + . These resonances have a 2 * rating only [18], except for the 3 * N (1900)3/2 + [19] which is observed in several partial wave analyses [20]. Here, we assume that all four resonances exist and that they form a spin-quartet [17].…”

mentioning

confidence: 99%

Three-Body Nature ofNandΔResonances from Sequential Decay Chains

Thiel¹,

Sokhoyan²,

Gutz³

et al. 2015

Phys. Rev. Lett.

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The N π 0 π 0 decays of positive-parity N * and ∆ * resonances at about 2 GeV are studied at ELSA by photoproduction of two neutral pions off protons. The data reveal clear evidence for several intermediate resonances: ∆(1232), N (1520)3/2 − , and N (1680)5/2 + , with spin-parities J P = 3/2 + , 3/2 − , and 5/2 + . The partial wave analysis (within the Bonn-Gatchina approach) identifies N (1440)1/2 + and the N (ππ)S−wave (abbreviated as N σ here) as further isobars, and assigns the final states to the formation of nucleon and ∆ resonances and to non-resonant contributions. We observe the known ∆(1232)π decays of ∆(1910)1/2 + , ∆(1920)3/2 + , ∆(1905)5/2 + , ∆(1950)7/2 + , and of the corresponding spin-parity series in the nucleon sector, N (1880)1/2 + , N (1900)3/2 + , N (2000)5/2 + , and N (1990)7/2 + . For the nucleon resonances, these decay modes are reported here for the first time. Further new decay modes proceed via N (1440)1/2 + π, N (1520)3/2 − π, N (1680)5/2 + π, and N σ. The latter decay modes are observed in the decay of N * resonances and at most weakly in ∆ * decays. It is argued that these decay modes provide evidence for a 3-quark nature of N * resonances rather than a quark-diquark structure.

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“…Its properties and even its existence have been debated intensively over time and seem to be intimately intertwined with the reaction π − p → K 0 Λ, as argued in the overview given in Ref. [100]. Similar arguments apply to the N(1900)3/2 + as outlined in that reference.…”

Section: Status Of Data and Analyses For Specific Reactionsmentioning

confidence: 85%

Physics opportunities with meson beams

et al. 2015

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Over the past two decades, meson photo-and electroproduction data of unprecedented quality and quantity have been measured at electromagnetic facilities worldwide. By contrast, the meson-beam data for the same hadronic final states are mostly outdated and largely of poor quality, or even nonexistent, and thus provide inadequate input to help interpret, analyze, and exploit the full potential of the new electromagnetic data. To reap the full benefit of the high-precision electromagnetic data, new high-statistics data from measurements with meson beams, with good angle and energy coverage for a wide range of reactions, are critically needed to advance our knowledge in baryon and meson spectroscopy and other related areas of hadron physics. To address this situation, a stateof-the-art meson-beam facility needs to be constructed. The present paper summarizes unresolved issues in hadron physics and outlines the vast opportunities and advances that only become possible with such a facility.

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Status of some P-wave baryon resonances and importance of inelastic channels

Cited by 3 publications

References 34 publications

Eta photoproduction in a combined analysis of pion- and photon-induced reactions

Eta photoproduction in a combined analysis of pion- and photon-induced reactions

Three-Body Nature ofNandΔResonances from Sequential Decay Chains

Physics opportunities with meson beams

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Status of some P-wave baryon resonances and importance of inelastic channels

Cited by 3 publications

References 34 publications

Eta photoproduction in a combined analysis of pion- and photon-induced reactions

Eta photoproduction in a combined analysis of pion- and photon-induced reactions

Three-Body Nature ofN*andΔ*Resonances from Sequential Decay Chains

Physics opportunities with meson beams

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Three-Body Nature ofNandΔResonances from Sequential Decay Chains