Photoproduction of neutral pions at backward angles in the resonance region and the ?-cusp

Althoff, K.H.; Gies, M.; Kaul, O.; Königsmann, K.; Menze, D.; Meyer, W.; Miczaika, T.; Pfeil, Walter-Josef; Roderburg, E.; Schwille, W. J.

doi:10.1007/bf01546970

Cited by 20 publications

(11 citation statements)

References 17 publications

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“…The S(1535) resonance is expected to have a large component of because of its large mass and strong coupling to KN. Figure 3 shows differential cross sections for S photoproduction as a function of the total energy, s. The cross sections measured in the present experiment are mostly consistent with previously published data [6][7][8][9] . Differential cross sections drastically decrease as energies up to ~2.1 GeV.…”

Section: Experimental Methodssupporting

confidence: 90%

Backward-meson photoproduction at SPring-8∕LEPS

Sumihama¹,

Khemchandani²,

Nagahiro³

et al. 2011

AIP Conference Proceedings

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Section: Experimental Methodssupporting

confidence: 90%

Backward-meson photoproduction at SPring-8∕LEPS

Sumihama¹,

Khemchandani²,

Nagahiro³

et al. 2011

AIP Conference Proceedings

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“…completely dominates both proton and neutron channels. And, as a side remark, due to the large branchings into the πN and ηN channels, this resonance produces a very significant cusp effect in the cross sections of pion photoproduction [73,74]. The second S 11 (1650) exhibits visible cusp effects due to the opening of the KΛ and KΣ channels.…”

Section: B Total Cross Sectionsmentioning

confidence: 99%

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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“…Such unitary cusps are for example well-known for pion production reactions. The cusp structure in π 0 and π + photoproduction off the proton at the η-production threshold was discussed in detail in [71], and the cusp structure in γp → pπ 0 at the γp → nπ + threshold was analyzed in [72]. From the experimental side obviously two pieces of information are missing to distinguish between these different scenarios.…”

Section: The Quasi-free Reaction γN → Nη Off the Neutronmentioning

confidence: 99%

Quasi-free photoproduction of η-mesons off the deuteron

Jaeglé¹,

Krusche²,

Anisovich³

et al. 2011

Eur. Phys. J. A

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Abstract. Precise data for quasi-free photoproduction of η mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5 GeV. The η-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the quasi-free reaction off the bound proton to η-production off the free proton. No significant effects beyond the folding of the free cross section with the momentum distribution of the bound protons have been found. These Fermi motion effects can be removed by an analysis using the invariant mass of the η-nucleon pairs reconstructed from the final state four-momenta of the particles. The total cross section for quasi-free η-photoproduction off the neutron reveals even without correction for Fermi motion a pronounced bump-like structure around 1 GeV of incident photon energy, which is not observed for the proton. This structure is even narrower in the invariant mass spectrum of the η-neutron pairs. Position and width of the peak in the invariant mass spectrum are W ≈ 1665 MeV and FWHM Γ ≈ 25 MeV. The data are compared to the results of different models.

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Photoproduction of neutral pions at backward angles in the resonance region and the ?-cusp

Cited by 20 publications

References 17 publications

Backward-meson photoproduction at SPring-8∕LEPS

Backward-meson photoproduction at SPring-8∕LEPS

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

Quasi-free photoproduction of η-mesons off the deuteron

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