Study of η and η' Photoproduction at MAMI

V L Kashevarov^{1

2}, P Ott¹, S Prakhov^{1

3

4}, P Adlarson¹, F Afzal⁵, Z Ahmed⁶, C S Akondi⁷, J R M Annand⁸, H J Arends¹, R Beck⁵, A Braghieri⁹, W J Briscoe³, F Cividini¹, R Codling⁸, C Collicott^{10

11}, S Costanza^{9

12}, A Denig¹, E J Downie^{1

3}, M Dieterle¹³, M I Ferretti Bondy¹, L V Fil'kov², A Fix¹⁴, S Gardner⁸, S Garni¹³, D I Glazier^{8

15}, D Glowa¹⁵, W Gradl¹, G Gurevich¹⁶, D J Hamilton⁸, D Hornidge¹⁷, D Howdle⁸, G M Huber⁶, A Käser¹³, S Kay¹⁵, I Keshelashvili¹³, R Kondratiev¹⁶, M Korolija¹⁸, B Krusche¹³, J Linturi¹, V Lisin¹⁶, K Livingston⁸, I J D MacGregor⁸, R MacRae⁸, J Mancell⁸, D M Manley⁷, P P Martel^{1

17}, J C McGeorge⁸, E McNicol⁸, D G Middleton^{1

17}, R Miskimen¹⁹, E Mornacchi¹, C Mullen⁸, A Mushkarenkov^{9

19}, A Neiser¹, M Oberle¹³, M Ostrick¹, P B Otte¹, B Oussena^{1

3}, D Paudyal⁶, P Pedroni⁹, V V Polyanski², A Rajabi¹⁹, G Reicherz²⁰, J Robinson⁸, G Rosner⁸, T Rostomyan¹³, A Sarty¹¹, D M Schott³, S Schumann¹, C Sfienti¹, V Sokhoyan^{1

3}, K Spieker⁵, O Steffen¹, B Strandberg⁸, I I Strakovsky³, Th Strub¹³, I Supek¹⁸, M F Taragin³, A Thiel⁵, M Thiel¹, L Tiator¹, A Thomas¹, M Unverzagt¹, S Wagner¹, D P Watts¹⁵, D Werthmüller^{8

13}, J Wettig¹, L Witthauer¹³, M Wolfes¹, R L Workman³, L Zana¹⁵; A2 Collaboration at MAMI

Affiliations

¹ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany.
² Lebedev Physical Institute, 119991 Moscow, Russia.
³ The George Washington University, Washington, D.C. 20052-0001, USA.
⁴ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
⁵ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany.
⁶ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
⁷ Kent State University, Kent, Ohio 44242-0001, USA.
⁸ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Italy.
¹⁰ Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
¹¹ Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada.
¹² Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.
¹³ Departement für Physik, Universität Basel, CH-4056 Basel, Switzerland.
¹⁴ Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634034 Tomsk, Russia.
¹⁵ SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
¹⁸ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁹ University of Massachusetts, Amherst, Massachusetts 01003, USA.
²⁰ Institut für Experimentalphysik, Ruhr-Universität, D-44780 Bochum, Germany.

PMID: 28598665
DOI: 10.1103/PhysRevLett.118.212001

Study of η and η' Photoproduction at MAMI

V L Kashevarov et al. Phys Rev Lett. 2017.

. 2017 May 26;118(21):212001.

doi: 10.1103/PhysRevLett.118.212001. Epub 2017 May 26.

Authors

Affiliations

¹ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany.
² Lebedev Physical Institute, 119991 Moscow, Russia.
³ The George Washington University, Washington, D.C. 20052-0001, USA.
⁴ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
⁵ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany.
⁶ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
⁷ Kent State University, Kent, Ohio 44242-0001, USA.
⁸ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Italy.
¹⁰ Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
¹¹ Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada.
¹² Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.
¹³ Departement für Physik, Universität Basel, CH-4056 Basel, Switzerland.
¹⁴ Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634034 Tomsk, Russia.
¹⁵ SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
¹⁸ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁹ University of Massachusetts, Amherst, Massachusetts 01003, USA.
²⁰ Institut für Experimentalphysik, Ruhr-Universität, D-44780 Bochum, Germany.

PMID: 28598665
DOI: 10.1103/PhysRevLett.118.212001

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 (E_{γ}=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.

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Study of η and η' Photoproduction at MAMI

Affiliations

Study of η and η' Photoproduction at MAMI

Authors

Affiliations

Abstract