Measurement of the beam asymmetry in eta-photoproduction off the proton
| dc.creator | al., D. Elsner et | |
| dc.date | 2007-02-14 | |
| dc.date.accessioned | 2026-07-07T11:23:50Z | |
| dc.date.available | 2026-07-07T11:23:50Z | |
| dc.description | The beam asymmetry, $Σ$, was measured at ELSA in the reaction $\vec γp \to ηp$ using linearly polarised tagged photon beams, produced by coherent bremsstrahlung off a diamond. The crystal was oriented to provide polarised photons in the energy range $E_γ= 800$ to 1400 MeV with the maximum polarisation of $P_γ= 49$ % obtained at 1305 MeV. Both dominant decay modes of the $η$ into two photons and $3π^0$ were used to extract the beam asymmetry from the azimuthal modulation of the cross section. The measurements cover the angular range $Θ_\text{cm}\simeq 50$ -- 150 degrees. Large asymmetries up to 80 % are observed, in agreement with a previous measurement. The eta-MAID model and the Bonn--Gatchina partial wave analysis describe the measurements, but the required partial waves differ significantly. | |
| dc.description | 8 pages, 8 figures, submitted to EPJA | |
| dc.identifier | https://arxiv.org/abs/nucl-ex/0702032 | |
| dc.identifier | http://arxiv.org/abs/nucl-ex/0702032 | |
| dc.identifier | Eur.Phys.J.A33:147-155,2007 | |
| dc.identifier | doi:10.1140/epja/i2007-10447-9 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195030 | |
| dc.subject | Nuclear Experiment | |
| dc.title | Measurement of the beam asymmetry in eta-photoproduction off the proton | |
| dc.type | text |