Remarks Bearing on the Interpretation of the Λ(1405) Resonance

Dalitz, R.H.; McGinley, J. G.

doi:10.1007/978-94-009-8381-6_29

Cited by 12 publications

(10 citation statements)

References 31 publications

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“…These two pieces of information are to some extent equivalent to a detection of ( apparently nonexistent ) Σ hypernuclei. The FINUDA data is related to a hyperon 5 He system. The only, so far, detected sigma hypernucleus has also been found in He.…”

Section: Discussionmentioning

confidence: 99%

“…5 He are in the bracket ( -28 till -26 MeV ) depending on absorptive strength tried in the region W o < 10 MeV motivated by the hyperhelium width. Differential equation (2) is integrated numerically to distances of 50 f m For technical simplicity the Coulomb potential is suppressed at distances exceeding 28 f m. These boundary conditions are good enough to obtain stability of the method and a three digit precision of energies and widths.…”

Section: The Origin Of Anomalous Threshold Peak In the σ + Momentummentioning

confidence: 99%

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Trapping of Σ⁺hyperons in nuclei

Wycech

Piscicchia

2016

EPJ Web Conf.

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Abstract. The nuclear capture of K − studied by FINUDA discovered a puzzling low momentum component in the spectrum of final Σ + hyperon. This component is interpreted here as the effect of Gamov state formed by the hyperon. Such state is quasi-localized in space with a radius in between the hyper-nuclear and the hyper-atomic radius. Experimental and theoretical consequences of this discovery are studied.

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Section: Discussionmentioning

confidence: 99%

Section: The Origin Of Anomalous Threshold Peak In the σ + Momentummentioning

confidence: 99%

Trapping of Σ⁺hyperons in nuclei

Wycech

Piscicchia

2016

EPJ Web Conf.

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“…This is definite evidence that the f 0 (980) behaves as a KK-molecule, just as Nathan Isgur [22] had suggested. This very same method could equally be applied to the Λ(1405), as Dalitz [23] had long ago proposed, see also [24]. Unfortunately the data on K − p → ππΣ and π − p → K 0 πΣ channels are not precise enough, with fine enough gradation, to be sure only the pole on the unphysical πΣ sheet below KN threshold is all that is required.…”

Section: Coupled Channelsmentioning

confidence: 97%

Exciting baryons: Now and in the future

Pennington

2012

AIP Conference Proceedings

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Abstract. This is the final talk of NSTAR2011 conference. It is not a summary talk, but rather a looking forward to what still needs to be done in excited baryon physics. In particular, we need to hone our tools connecting experimental inputs with QCD. At present we rely on models that often have doubtful connections with the underlying theory, and this needs to be dramatically improved, if we are to reach definitive conclusions about the relevant degrees of freedom of excited baryons. Conclusions that we want to have by NSTAR2021.Keywords: Baryons, spectrum, decays, coupled channels, mesons, QCD PACS: 13.30.Eg, 11.80.Et, 14.40.Be, WHERE WE AREOne cannot look to the future of the baryon physics program without reviewing where we are at present. For the past 50 years we have sought to understand the spectrum of baryons. It is sometimes thought that spectroscopy is nothing more than stamp collecting, making pretty patterns, but providing few insights into the workings of the world. This is to misunderstand its fundamental importance. The spectrum of states of any system are determined by the constituents that make up that system and the forces that bind them together. Thus the spectrum provides us with insights into the fundamental degrees of freedom and into the nature of strong coupling QCD.Baryons have a special place in the panoply of hadrons, as their structure is most obviously related to the color degree of freedom. While a color singlet quark-antiquark system is basically the same however many colors there are, the minimum number of quarks in a baryon is intimately tied to the number of colors. If N c were five, the world would be quite different. Moreover the flavor pattern of baryons was a key ingredient in the development of the quark model. This simple model has long served as the paradigm for what we expect the baryon spectrum, both nucleons and ∆'s, to look like [1]. The most quoted template, Fig. 1, was provided by Capstick and Roberts [2], based on three independent quark degrees of freedom, Fig 2. While the lower lying states have been well determined by experiment, many of those above 1.6 GeV or so are missing. A possible reason for this could be that most of the early evidence was accumulated from πN scattering, and decays into the same channel. Perhaps these states are missing because we have not looked in the right place. Consequently, there has been a major effort to investigate other channels like ππN and KY . These are an increasing part of the πN total cross-section as the energy goes up. However, for the most part they have only contributed hints and glimpses of missing states and not yet too much new definitive evidence.

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“…The polarimeter tags Møller scattering events through coincident detection of the two outgoing electrons in a pair of lead glass detectors of thickness 6.4 cm. Lead plates of 1 cm thickness in front of the detectors ensure the shower maximum to lie inside the detector material for the symmetric scattering case at the magic 6 beam energy of 2.4 GeV. To minimise systematic errors through the Levchuk effect [35], symmetric scattering is selected through momentum.…”

Section: Circular Polarisation and Møller Polarimetrymentioning

confidence: 99%

“…Corresponding models indeed appear more successful than genuine three constituent quark models in some aspects, for example, determining the parity ordering of the lowest nucleon excitations [5]. Meson-baryon dynamics seem to play an important role for higher baryon excitations too [6][7][8][9][10][11][12][13][14]. In addition to the interaction of pseudoscalar mesons with baryons, vector mesons should also contribute to resonance formation [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of Mesons

Schmieden

Клейн

2017

EPJ Web Conf.

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Abstract. B.1 is one of the experimental projects within the CRC 16. It aims at the systematic investigation of the photoproduction of mesons off nucleons in order to understand reaction mechanisms and the relevant degrees of freedom in resonance formation. Of particular interest is the photoproduction of mesons heavier than the pion and resonances involving hidden or open strangeness. Essential hardware contributions have been made to the experimental programme of the CRC 16 through tagging systems, and photon-beam polarisation and polarimetry. A new experiment has been set up within the framework of the BGO-OD collaboration. This combines a forward magnetic spectrometer with a central BGO calorimeter with charged particle recognition and identification. The BGO-OD experiment enables reconstruction of complex final states composed of both charged and neutral particles, complementary to the existing CBELSA/TAPS calorimeter which is optimised for multi-photon final states. Selected results of the 12-year CRC period are presented from both experiments.

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Remarks Bearing on the Interpretation of the Λ(1405) Resonance

Cited by 12 publications

References 31 publications

Trapping of Σ⁺hyperons in nuclei

Trapping of Σ⁺hyperons in nuclei

Exciting baryons: Now and in the future

Photoproduction of Mesons

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Remarks Bearing on the Interpretation of the Λ(1405) Resonance

Cited by 12 publications

References 31 publications

Trapping of Σ+hyperons in nuclei

Trapping of Σ+hyperons in nuclei

Exciting baryons: Now and in the future

Photoproduction of Mesons

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Trapping of Σ⁺hyperons in nuclei

Trapping of Σ⁺hyperons in nuclei