Well-Established Nucleon Resonances Revisited by Double-Polarization Measurements

Thiel, A.; Anisovich, A. V.; Bayadilov, D.; Bantes, B.; Beck, R.; Beloglazov, Y. A.; Bichow, M.; Boese, S.; Brinkmann, K.-Th.; Challand, Th.; Credé, V.; Dietz, F.; Drexler, P.; Dutz, H.; Eberhardt, H.; Elsner, D.; Ewald, R.; Fornet-Ponse, K.; Friedrich,; Frommberger, F.; Funke, Ch.; Gottschall, M.; Gruener, M.; Gutz, E.; Hammann, Ch.; Hannappel, J.; Hartmann, J.; Hillert, W.; Hoffmeister, P.; Honisch, Christiane; Jaeglé, I.; Juergensen, I.; Kaiser, David; Kalinowsky, H.; Kalischewski, F.; Kammer, S.; Keshelashvili, I.; Kleber, V.; Клейн, Ф.; Klempt, E.; Krusche, B.; Lang, Μ.; Lopatin, I.; Maghrbi, Y.; Makónyi, K.; Metag, V.; Meyer, W.; Mueller, J.; Nanova, M.; Nikonov, V. A.; Novotny, R.; Piontek, D.; Reicherz, G.; Sarantsev, A.; Schmidt, Ch.; Schmieden, H.; Seifen, T.; Sokhoyan, V.; Sumachev, V. V.; Thoma, U.; vanPee, H.; Walther, Dirk; Wendel, Ch.; Wiedner, U.; Wilson, A.; Winnebeck, A.; Wunderlich, Y.

doi:10.1103/physrevlett.109.102001

Cited by 67 publications

(41 citation statements)

References 21 publications

(24 reference statements)

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“…The predictions of JüBo show a similar disagreement as SAID for the two lowest photon energy bins at E γ = 633 and 667 MeV. The differences between the predictions of the MAID model and the data in the medium energy region were discussed in [86] and traced back to the multipoles E 0+ and E 2− . The largest deviations between the different models can be observed in the higher energy bins (E γ > 1150 MeV).…”

Section: Differential Cross Sections and The Beam Asymmetry σmentioning

confidence: 75%

“…In addition to the data on T , P, and H, differential cross section data (e.g. [71]), data on Σ [90,91,96], G [86] and on E [100] were included for this reaction, making in total seven observables available for the PWA. It should be mentioned that this was the first time that the available data allowed for an energy-independent reconstruction of multipoles in the energy range covering the second resonance region of N(1520)3/2 − and N(1535)1/2 − .…”

Section: γP → π 0 P: the Polarization Observables T P Hmentioning

confidence: 99%

“…Interesting phenomena can be seen drawing the χ 2 /n df of each fitted order L max ≥ 1 against the center-of-mass energy W. Such plots are shown in Figs. 14, 15, and 16 for G [86,87], E [101], and T [102,103]. For specific truncation orders, bumps can be observed in the χ 2 -plots within certain energy regions.…”

Section: : An Expansion Into Partial Wavesmentioning

confidence: 99%

See 2 more Smart Citations

Spectroscopy of baryon resonances

Beck

Thoma

2017

EPJ Web Conf.

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Abstract. Within project A.1 of the SFB/TR16 "Subnuclear Structure of Matter", a large amount of data on photoproduction reactions has been accumulated at the Bonn Electron Stretcher Accelerator ELSA with the CBELSA/TAPS detector and was analysed in detail. In particular, data have been taken with unpolarized or with linearly or circularly polarized photons and with unpolarized or with longitudinally or transversely polarized protons. Photoproduction off neutrons was studied to determine the helicity amplitudes for the excitation of resonances off neutrons. In a partial wave analysis of the data, new resonances have been found and the properties of new and of known resonances have been determined, including the measurement of partial widths of so far unmeasured decay modes.

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Section: Differential Cross Sections and The Beam Asymmetry σmentioning

confidence: 75%

Section: γP → π 0 P: the Polarization Observables T P Hmentioning

confidence: 99%

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Spectroscopy of baryon resonances

Beck

Thoma

2017

EPJ Web Conf.

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“…Further measurements are planned to increase the statistics to investigate other reactions and higher energies. Together with the measurements with a longitudinally polarized target and both linearly [15] or circularly [16] polarized photon beams this is an important step towards the complete experiment and will provide further constraints for the partial wave analysis.…”

Section: Measurement Of Double Polarization Observables With the Cbelmentioning

confidence: 99%

Measurement of double polarization observables in meson photoproduction with the CBELSA/TAPS experiment

Hartmann¹

2014

Proceedings of XV International Conference on Hadron Spectroscopy — PoS(Hadron 2013)

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One of the remaining problems within the standard model is to gain a good understanding of the low energy regime of QCD, where perturbative methods fail. One key towards a better understanding is baryon spectroscopy. Unfortunately, in the past most baryon spectroscopy data have been obtained only using πN scattering. To gain access to resonances with small πN partial width, photoproduction experiments, investigating various final states, provide essential information. In order to extract the contributing resonances, partial wave analyses need to be performed. Here, the complete experiment is required to unambiguously determine the contributing amplitudes. This involves the measurement of carefully chosen single and double polarization observables. The Crystal Barrel/TAPS experiment with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam allows the measurement of a large set of polarization observables. Due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage, it is ideally suited for the measurement of the photoproduction of neutral mesons decaying into photons. Preliminary results for the target asymmetry T , recoil polarization P and the double polarization observable H are discussed for π 0 and η photoproduction off the proton.

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“…1 show that the N * 's and * 's from these two analyses have much in common, but there are some key differences that need to be resolved. The measurement of double polarization asymmetries, like the so called G-function with linearly polarized photons on a longitudinally polarized target open a unique window on to the higher partial waves [8,9]. They show that the need for important spin-3 components above 1.55 GeV, seen in the top right corner of at this conference [8,10].…”

mentioning

confidence: 99%

SPQR – Spectroscopy: Prospects, Questions & Results

Pennington

2014

EPJ Web of Conferences

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Abstract. Tremendous progress has been made in mapping out the spectrum of hadrons over the past decade with plans to make further advances in the decade ahead. Baryons and mesons, both expected and unexpected, have been found, the results of precision experiments often with polarized beams, polarized targets and sometimes polarization of the final states. All these hadrons generate poles in the complex energy plane that are consequences of the strong coupling regime of QCD. They reveal how this works.

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Well-Established Nucleon Resonances Revisited by Double-Polarization Measurements

Cited by 67 publications

References 21 publications

Spectroscopy of baryon resonances

Spectroscopy of baryon resonances

Measurement of double polarization observables in meson photoproduction with the CBELSA/TAPS experiment

SPQR – Spectroscopy: Prospects, Questions & Results

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