dc.contributor.author |
Witthauer, L. |
|
dc.contributor.author |
Dieterle, M. |
|
dc.contributor.author |
Abt, S. |
|
dc.contributor.author |
Achenbach, P. |
|
dc.contributor.author |
Afzal, F. |
|
dc.contributor.author |
Ahmed, Z. |
|
dc.contributor.author |
Annand, J. R. M. |
|
dc.contributor.author |
Arends, H. J. |
|
dc.contributor.author |
Bashkanov, M. |
|
dc.contributor.author |
Beck, R. |
|
dc.contributor.author |
Biroth, M. |
|
dc.contributor.author |
Borisov, N. S. |
|
dc.contributor.author |
Braghieri, A. |
|
dc.contributor.author |
Briscoe, W. J. |
|
dc.contributor.author |
Cividini, F. |
|
dc.contributor.author |
Costanza, S. |
|
dc.contributor.author |
Collicott, C. |
|
dc.contributor.author |
Denig, A. |
|
dc.contributor.author |
Downie, E. J. |
|
dc.contributor.author |
Drexler, P. |
|
dc.contributor.author |
Ferretti-Bondy, M. I. |
|
dc.contributor.author |
Gardner, S. |
|
dc.contributor.author |
Garni, S. |
|
dc.date.accessioned |
2018-02-08T07:05:22Z |
|
dc.date.available |
2018-02-08T07:05:22Z |
|
dc.date.issued |
2016-09-22 |
|
dc.identifier.citation |
Physical Review Letters, 117, 132502 |
en_US |
dc.identifier.issn |
0031-9007 |
|
dc.identifier.uri |
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.117.132502 |
|
dc.identifier.uri |
http://repository.seku.ac.ke/handle/123456789/3832 |
|
dc.description |
DOI:https://doi.org/10.1103/PhysRevLett.117.132502 |
en_US |
dc.description.abstract |
The double polarization observable E and the helicity dependent cross sections σ1/2 and σ3/2 were measured for η photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4π detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from η→2γ and η→3π0. The results show that the narrow structure previously observed in η photoproduction from the neutron is only apparent in σ1/2 and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in η production are only N1/2− (S11) and N 1/2+ (P11). Furthermore, the extracted Legendre coefficients of the angular distributions for σ1/2 are in good agreement with recent reaction model predictions assuming a narrow resonance in the P11 wave as the origin of this structure. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
American Physical Society |
en_US |
dc.subject |
photon: beam |
en_US |
dc.subject |
polarization: longitudinal |
en_US |
dc.subject |
cross section |
en_US |
dc.subject |
helicity: dependence |
en_US |
dc.subject |
eta: photoproduction |
en_US |
dc.subject |
tagged beam |
en_US |
dc.subject |
nucleon: recoil |
en_US |
dc.subject |
photon: decay |
en_US |
dc.subject |
angular distribution |
en_US |
dc.subject |
nucleon resonance |
en_US |
dc.subject |
narrow resonance |
en_US |
dc.subject |
partial wave analysis |
en_US |
dc.subject |
bremsstrahlung |
en_US |
dc.subject |
deuterium: liquid |
en_US |
dc.subject |
Crystal Ball |
en_US |
dc.subject |
Mainz Linac |
en_US |
dc.subject |
p |
en_US |
dc.subject |
n |
en_US |
dc.subject |
experimental results |
en_US |
dc.title |
Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections |
en_US |
dc.type |
Article |
en_US |