6533b855fe1ef96bd12b11e1
RESEARCH PRODUCT
Study of η and η′ Photoproduction at MAMI
H. J. ArendsT. RostomyanF. AfzalS. GarniP. PedroniA. RajabiReinhard BeckS. CostanzaM. OberleK. SpiekerB. OussenaE. McnicolA. ThomasG. M. HuberC. CollicottJ. C. McgeorgeD. P. WattsD. I. GlazierD. I. GlazierM. UnverzagtK. LivingstonB. StrandbergS. GardnerA. MushkarenkovR. KondratievConcettina SfientiR. MiskimenA. ThielJ. R. M. AnnandV. V. PolyanskiJ. WettigG. M. GurevichS. SchumannM. F. TaraginTh. StrubMichaela ThielV. L. KashevarovF. CividiniB. KruscheV. SokhoyanA. NeiserL. TiatorIgor StrakovskyW. J. BriscoeA. BraghieriD. HornidgeDavid ManleyV. LisinDavid HamiltonA. FixD. GlowaJ. MancellM. OstrickP. B. OtteM. DieterleO. SteffenJ. LinturiW. GradlD. G. MiddletonI. KeshelashviliS. N. PrakhovP. OttP. P. MartelS. KayM. KorolijaRon L. WorkmanRoderick M. MacraeL. V. Fil'kovL. ZanaG. RosnerA. KäserD. HowdleC. S. AkondiLilian WitthauerD. M. SchottA. J. SartyS. WagnerI. SupekG. ReicherzM. I. Ferretti BondyZ. AhmedP. AdlarsonE. J. DownieD. WerthmüllerC. MullenA. G. DenigDurga PaudyalM. WolfesR. F. B. CodlingE. MornacchiI. J. D. MacgregorJ. Robinsonsubject
Cusp (singularity)PhysicsParticle physicsPhotonProton010308 nuclear & particles physicsGeneral Physics and Astronomy01 natural sciencesNuclear physicsCross section (physics)Excited state0103 physical sciencesIsobar010306 general physicsMicrotronCrystal Balldescription
The reactions γp→ηp and γp→η′p are measured from their thresholds up to the center-of-mass energy W=1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η′ threshold, W=1896 MeV (Eγ=1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η′ total cross section from its threshold, can only be explained by a strong coupling of the poorly known N(1895)1/2− state to both ηp and η′p. Including the new high-accuracy results in the ηMAID fit to available η and η′ photoproduction data allows the determination of the N(1895)1/2− properties.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-05-26 | Physical Review Letters |