Photoproduction of eta pi pairs off nucleons and deuterons

Kaser, A. and Muller, F. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Bartolome, P. A. and Beck, R. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Costanza, S. and Dieterle, M. and Downie, E. J. and Drexler, P. and Fil`kov, L. V. and Fix, A. and Garni, S. and Glazier, D. I. and Hamilton, D. and Hornidge, D. and Howdle, D. and Huber, G. M. and Jaegle, I. and Jude, T. C. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. 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, P. and Oussena, B. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. and Robinson, J. and Rostomyan, T. and Schumann, S. and Sikora, M. H. and Sober, D. and Starostin, A. and Strub, Th. and Supek, I. and Thiel, M. and Thomas, A. and Unverzagt, M. and Walford, N. K. and Watts, D. P. and Werthmuller, D. and Witthauer, L.. (2016) Photoproduction of eta pi pairs off nucleons and deuterons. European Physical Journal A: Hadrons and Nuclei , 52 (9). p. 272.

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Abstract

Quasi-free photoproduction of πη-pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to 1.9 GeV. Total cross sections, angular distributions, invariant-mass distributions of the πη and meson-nucleon pairs, and beam-helicity asymmetries have been measured for the reactions γp→pπ0η, γn→nπ0η , γp→nπ+η , and γn→pπ−η from nucleons bound inside the deuteron. For the γp initial-state data for free protons have also been analyzed. Finally, the total cross sections for quasi-free production of π0η pairs from nucleons bound in 3 He nuclei have been investigated in view of final state interaction (FSI) effects. The experiments were performed at the tagged photon beam facility of the Mainz MAMI accelerator using an almost 4π covering electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. The shapes of all differential cross section data and the asymmetries are very similar for protons and neutrons and agree with the conjecture that the reactions are dominated by the sequential Δ⋆3/2−→ηΔ(1232)→πηN decay chain, mainly with Δ(1700)3/2− and Δ(1940)3/2− . The ratios of the magnitude of the total cross sections also agree with this assumption. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

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:	EDP Sciences with Springer and Società Italiana di Fisica
ISSN:	1434-6001
e-ISSN:	1434-601X
Note:	Publication type according to Uni Basel Research Database: Journal article
Identification Number:	doi: 10.1140/epja/i2016-16272-1 isi: 000383155400004
Last Modified:	22 Feb 2017 14:40
Deposited On:	22 Feb 2017 14:40

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