The isospin structure of photoproduction of pi eta pairs from the nucleon in the threshold region

Kaeser, A. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Bartolome, P. A. and Beck, R. and Bekrenev, V. and Berghaeuser, H. and Braghieri, A. and Branford, D. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Costanza, S. and Demissie, B. and Dieterle, M. and Downie, E. J. and Drexler, R. and Fil`kov, L. V. and Fix, A. and Glazier, D. I. and Hamilton, D. and Heid, E. and Hornidge, D. and Howdle, D. and Huber, G. M. and Jahn, O. and Jaegle, I. and Jude, T. C. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Kruglov, S. P. and Krusche, B. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Maghrbi, Y. and Mancell, J. and Manley, D. M. and Marinides, Z. and McGeorge, J. C. and McNicoll, E. and Mekterovic, D. and Metag, V. and Micanovic, S. and Middleton, D. G. and Mushkarenkov, A. and Nikolaev, A. and Novotny, R. and Oberle, M. and Ostrick, M. and Otte, R. and Oussena, B. and Pedroni, R. and Pheron, F. and Polonski, A. and Prakhov, S. N. and Robinson, J. and Rosner, G. and Rostomyan, T. and Schumann, S. and Sikora, M. H. and Sober, D. I. and Starostin, A. and Supek, I. and Thiel, M. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Werthmueller, D. and Witthauer, L.. (2015) The isospin structure of photoproduction of pi eta pairs from the nucleon in the threshold region. Physics letters B, 748. pp. 244-250.

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Abstract

Photoproduction of pi eta-pairs from nucleons has been investigated from threshold up to incident photon energies of approximate to 1.4GeV. The quasi-free reactions gamma p -> p pi(0)eta, gamma n -> n pi(0)eta, gamma p -> n pi(+)eta and gamma n -> p pi(-)eta were for the first time measured from nucleons bound in the deuteron. The corresponding reactions from a free-proton target were also studied to investigate final-state interaction effects (for neutral pions the free-proton results could be compared to previous measurements; the gamma p -> n pi(+)eta reaction was measured for the first time). For the pi(0)eta final state coherent production via the gamma d -> d pi(0)eta reaction was also investigated. The experiments were performed at the tagged photon beam of the Mainz MAMI accelerator using an almost 4 pi coverage electromagnetic calorimeter composed of the Ball and TAPS detectors. The total cross sections for the four different final states obey the relation sigma(p pi(0)eta) approximate to sigma(n pi(0)eta) approximate to 2 sigma(n pi(+)eta) as expected for a dominant contribution from a Delta* -> eta Delta(1232) -> pi eta Nreaction chain, which is also supported by the shapes of the invariant-mass distributions of nucleon-meson and pi-eta pairs. The experimental results are compared to the predictions from an isobar reaction model. (C) 2015 The Authors. Published by Elsevier B.V.

Faculties and Departments:	05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:	Krusche, Bernd
Item Type:	Article, refereed
Article Subtype:	Research Article
Publisher:	Elsevier B.V.
ISSN:	0370-2693
Note:	Publication type according to Uni Basel Research Database: Journal article
Identification Number:	doi: 10.1016/j.physletb.2015.07.007 isi: 000359146200037
Last Modified:	30 Jun 2016 11:01
Deposited On:	09 May 2016 09:14

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