Evaluation of the gn--&gt;pi-p differential cross sections in the Delta-isobar region

Briscoe, W. J.; Kudryavtsev, A. E.; Pedroni, P.; Strakovsky, I. I.; Tarasov, V. E.; Workman, R. L.

doi:10.48550/arxiv.1209.0024

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…The extension to ηN , KΛ and KΣ photoproduction is planned for the future and will require direct photon couplings to these states. As for photoproduction on the neutron, the JLab FROST and HD-ICE experiments are currently being analyzed [108,109] and theoretical methods are being developed to disentangle the neutron amplitudes [101,110,111] For completeness, a multipole decomposition of the pseudoscalar meson photoproduction amplitude is given in Appendix A.…”

Section: B Two-potential Formalism For Photoproductionmentioning

confidence: 99%

Photocouplings at the pole from pion photoproduction

et al. 2014

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The reactions γp → π 0 p and γp → π + n are analyzed in a semi-phenomenological approach up to E ∼ 2.3 GeV. Fits to differential cross section and single and double polarization observables are performed. A good overall reproduction of the available photoproduction data is achieved. The Jülich2012 dynamical coupled-channel model -which describes elastic πN scattering and the world data base of the reactions πN → ηN , KΛ, and KΣ at the same time -is employed as the hadronic interaction in the final state. The framework guarantees analyticity and, thus, allows for a reliable extraction of resonance parameters in terms of poles and residues. In particular, the photocouplings at the pole can be extracted and are presented.

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Section: B Two-potential Formalism For Photoproductionmentioning

confidence: 99%

Photocouplings at the pole from pion photoproduction

et al. 2014

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“…Many research groups carry out low-energy, coupledchannel, partial-wave analyses (PWA) for baryon spectroscopy. Currently, the most active are ANL-Osaka [22], Bonn-Gatchina [23,24], JPAC [25,26], Jülich-Bonn [27,28], MAID [29], and SAID [30,31]. These groups perform global fits to hadro-and/or photoproduction data using a finite set of partial waves to extract baryon resonance properties [32,33].…”

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confidence: 99%

Analyticity constraints for hadron amplitudes: Going high to heal low-energy issues

Mathieu¹,

Nys²,

Pilloni³

et al. 2018

EPL

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Analyticity constitutes a rigid constraint on hadron scattering amplitudes. This property is used to relate models in different energy regimes. Using meson photoproduction as a benchmark, we show how to test contemporary low energy models directly against high energy data. This method pinpoints deficiencies of the models and treads a path to further improvement. The implementation of this technique enables one to produce more stable and reliable partial waves for future use in hadron spectroscopy and new physics searches.Introduction.-Determination of various hadronic effects represents a major challenge in searches for New Physics through precision measurements [1][2][3][4][5]. For example, the possible identification of Beyond Standard Model signals in B meson decays is hindered by uncertainties in hadronic final state interactions. The strongly coupled nature of QCD prevents us from computing these effects directly from the underlying microscopic formulation. Nevertheless, one can use the first principles of Smatrix theory to impose stringent constraints on hadron scattering amplitudes [6][7][8]. These approaches are encountering a renewed interest even in the more formal context of strongly coupled theories [9][10][11].In this Letter, we show how to use analyticity to relate the amplitudes at high energies to the physics at low energies, where resonance effects dominate. This is not only important for reducing hadronic uncertainties in the aforementioned processes, but is of interest on its own merits for unraveling the spectrum of QCD. According to phenomenological predictions and lattice QCD simulations, the current spectrum summarized in the Particle Data Group (PDG) is far from complete [12]. For example, the recent discoveries of unexpected peaks in data indicate that the true hadron spectrum is far more complex than predicted [13][14][15][16][17][18]. As a working case, we focus here on the baryon sector in the intermediate energy range. In the PDG these N * and ∆ resonances are referred to as "poorly known" [12], despite the large amount of data available. The ambiguities encountered when identifying resonances are related to the fact that, as the center of mass energy increases, so does the number of contributing partial waves, vastly complicating the reaction models used in data analysis. The 2 − 3 GeV mass region is of particular interest for baryon spectroscopy since, besides the ordinary quark model multiplets, it is expected

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Evaluation of the gn-->pi-p differential cross sections in the Delta-isobar region

Cited by 2 publications

References 5 publications

Photocouplings at the pole from pion photoproduction

Photocouplings at the pole from pion photoproduction

Analyticity constraints for hadron amplitudes: Going high to heal low-energy issues

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