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Study of η and η' Photoproduction at MAMI

Kashevarov, V. L. and Ott, P. and Prakhov, S. and Adlarson, P. and Afzal, F. and Ahmed, Z. and Akondi, C. S. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Braghieri, A. and Briscoe, W. J. and Cividini, F. and Codling, R. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Dieterle, M. and Bondy, M. I. Ferretti and Fil`kov, L. V. and Fix, A. and Gardner, S. and Garni, S. and Glazier, D. I. and Glowa, D. and Gradl, W. and Gurevich, G. and Hamilton, D. J. and Hornidge, D. and Howdle, D. and Huber, G. M. and Kaser, A. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Linturi, J. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and MacRae, R. and Mancell, J. and Manley, D. M. and Martel, P. P. and McGeorge, J. C. and McNicol, E. and Middleton, D. G. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Mushkarenkov, A. and Neiser, A. and Oberle, M. and Ostrick, M. and Otte, P. B. and Oussena, B. and Paudyal, D. and Pedroni, P. and Polyanski, V. V. and Rajabi, A. and Reicherz, G. and Robinson, J. and Rosner, G. and Rostomyan, T. and Sarty, A. and Schott, D. M. and Schumann, S. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strandberg, B. and Strakovsky, I. I. and Strub, Th. and Supek, I. and Taragin, M. F. and Thiel, A. and Thiel, M. and Tiator, L. and Thomas, A. and Unverzagt, M. and Wagner, S. and Watts, D. P. and Werthmuller, D. and Wettig, J. and Witthauer, L. and Wolfes, M. and Workman, R. L. and Zana, L.. (2017) Study of η and η' Photoproduction at MAMI. Physical Review Letters, 118 (21). p. 212001.

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Abstract

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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
e-ISSN:1079-7114
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:15 Jan 2018 13:58
Deposited On:15 Jan 2018 13:52

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