6533b855fe1ef96bd12afdbe

RESEARCH PRODUCT

Measurement of the transverse target and beam-target asymmetries in η meson photoproduction at MAMI

M. OberleP. P. MartelM. DieterleB. OussenaAron M. BernsteinC. CollicottD. P. WattsA. B. NeganovE. F. McnicollS. CherepnyaH. OrtegaDavid HamiltonW. GradlA. N. MushkarenkovA. N. MushkarenkovW. MeyerW. J. BriscoeJ. MancelD. HornidgeG. ReicherzP. Hall BarrientosB. KruscheV. LisinE. J. DownieI. J. D. MacgregorV. L. KashevarovV. L. KashevarovLothar TiatorK. LivingstonN. S. BorisovP. PedroniD. WerthmüllerR. A. MiskimenR. KondratievG. M. GurevichA. FixD. M. ManleyM. KorolijaP. OttA. PolonskiS. CostanzaS. N. PrakhovYu. A. UsovO. SteffenV. V. PolyanskiR. BeckM. WolfesA. B. LazarevA. BraghieriTh. StrubS. GarniI. I. StrakovskyH. J. ArendsD. G. MiddletonLilian WitthauerG. M. HuberAnthony W. ThomasD. I. GlazierI. KeshelashviliJ. R. M. AnnandS. SchumannP. B. OtteA. NikolaevB. M. K. NefkensD. HowdleL. V. Fil'kovC. S. AkondiM. OstrickA. J. SartyI. SupekT. RostomyanM. Unverzagt

subject

PhysicsParticle physicsPhotonProtonMesonNuclear Theorymedia_common.quotation_subjectPartial wave analysisNuclear TheoryGeneral Physics and AstronomyAsymmetryHigh Energy Physics - ExperimentNuclear physicsbeam-target asymmetry F; γ⃗ p⃗ →ηp reaction; Mainz Microtron MAMIHigh Energy Physics::ExperimentNucleonNuclear ExperimentMicrotronNuclear ExperimentCrystal Ballmedia_common

description

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.

10.1103/physrevlett.113.102001https://doi.org/10.1103/physrevlett.113.102001