Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018

Tiator, L.; Gorchtein, M.; Kashevarov, V.L.; Nikonov, K.; Ostrick, M.; Hadžimehmedović, M.; Omerović, R.; Osmanović, H.; Stahov, J.; Švarc, A.

doi:10.1140/epja/i2018-12643-x

Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018

L. Tiator
(
- Mainz U., Inst. Kernphys.
)
,
M. Gorchtein
(
- Mainz U., Inst. Kernphys.
)
,
V.L. Kashevarov
(
- Mainz U., Inst. Kernphys.
)
,
K. Nikonov
(
- Mainz U., Inst. Kernphys.
)
,
M. Ostrick
(
- Mainz U., Inst. Kernphys.
)

Jul 12, 2018

31 pages

Published in:

Eur.Phys.J.A 54 (2018) 12, 210

Published: Dec 6, 2018

e-Print:

1807.04525 [nucl-th]

DOI:

10.1140/epja/i2018-12643-x

View in:

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Abstract: (Springer)

The isobar model EtaMAID has been updated with new and high precision data for

\eta

and

\eta^{\prime}

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^{\ast}

states contributing to

\eta

photoproduction and 12

N^{\ast}

states contributing to

\eta^\prime

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(\gamma,\eta^{\prime})p

near

\eta^{\prime}

threshold.

Note:

31 pages, 29 figures, replaced with revised version

eta: photoproduction
eta(958): photoproduction
isobar model
partial wave
angular dependence
nucleon resonance
narrow resonance
Bonn ELSA Stor
Mainz Linac
CLAS

References(87)

Figures(29)

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