Neutron helicity amplitudes

Anisovich, A. V.; Burkert, Volker; Compton, N.; Hicks, K.; Klein, F. J.; Klempt, E.; Nikonov, V. A.; Sandorfi, A. M.; Sarantsev, A.; Thoma, U.

doi:10.1103/physrevc.96.055202

Cited by 33 publications

(56 citation statements)

References 78 publications

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“…In both channels the S 11 resonance dominates near threshold and the second largest peak arises from P 11 , followed by large contributions from F -wave resonances. This is different in the most recent BnGa analysis [32], where the P 13 (1900) plays a dominant role and F -waves are practically negligible. Such ambiguities in the PWA can be expected when only two observables are measured as in the η proton channel.…”

Section: B Total Cross Sectionscontrasting

confidence: 58%

Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018

et al. 2018

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The isobar model EtaMAID has been updated with new and high precision data for η and η photoproduction on protons and neutrons from MAMI, ELSA, GRAAL and CLAS. The background is described in a recently developed Regge-cut model, and for the resonance part the whole list of nucleon resonances has been investigated with 21 N * states contributing to η photoproduction and 12 N * states contributing to η photoproduction. A new approach is discussed to avoid double counting in the overlap region of Regge and resonances. A comparison is done among four newly updated partial waves analyses for observables and partial waves. Finally, the possibility of a narrow resonance near W = 1900 MeV is discussed, that would be able to explain unexpected energy and angular dependence of observables in p(γ, η )p near η threshold.

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Section: B Total Cross Sectionscontrasting

confidence: 58%

Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018

et al. 2018

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“…The photocouplings of baryon resonances are mostly given as helicity amplitudes A 1/2 , A 3/2 , and for excitations off protons, we gave these quantities only [103]. In a fit to data on photoproduction off neutrons, we evaluated also the electric and magnetic multipole amplitudes [104]. In many cases, + .…”

Section: Negative Parity Resonancesmentioning

confidence: 99%

Partial wave analysis

2017

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Abstract. The project A.2 of the SFB/TR16 "Subnuclear Structure of Matter" aimed at a combined multichannel partial wave analysis of all or of most data on pion and photo-induced reactions for invariant masses from the Δ(1232) region to 2300 MeV. In this review the most important results are presented. It is shown that the data and their partial wave analysis have improved our understanding of the dynamics of excited light-quark baryons significantly.

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“…The fit was further constrained by the data photoproduction off protons. Recently, CLAS reported new and very precise data on γn → K 0 Λ; the new data allowed for a new determination of the helicity amplitudes for photoproduction of neutrons [137].…”

Section: Helicity Amplitudes Off Neutronsmentioning

confidence: 99%

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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Neutron helicity amplitudes

Cited by 33 publications

References 78 publications

Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018

Eta and etaprime photoproduction on the nucleon with the isobar model EtaMAID2018

Partial wave analysis

Spectroscopy of baryon resonances

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