Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI

Abstract

We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the $\vec{\gamma }\vec{p}\to \eta p$ reaction up to a center-of-mass energy of W=1.9 GeV. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of $\eta$ meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.

5 pages, 3 figures, accepted for publication in PRL

References in corpus (7)

• Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• Quasi-free photoproduction of eta-mesons of the neutron
• P-wave excited baryons from pion- and photo-induced hyperon production
• Recoil polarization and beam-recoil double polarization measurement of ηelectroproduction on the proton in the region of the S_{11}(1535) resonance

Cited by in corpus (6)

• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• Light Baryon Spectroscopy
• Photoproduction of $\eta$ mesons off the proton for $1.2<E_{\gamma }<4.7$ GeV using CLAS at Jefferson Laboratory
• Truncated Partial-Wave Analysis for $\eta$-photoproduction observables via Bayesian Statistics
• Experimental study of $\eta$ meson photoproduction reaction at MAMI
• Double polarisation experiments in meson photoproduction