Photoproduction of ηπ pairs off nucleons and deuterons
- Käser, A.
- Müller, F.
- Ahrens, J.
- Annand, J. R. M.
- Arends, H. J.
- Bantawa, K.
- Bartolome, P. A.
- Beck, R.
- Braghieri, A.
- Briscoe, W. J.
- Cherepnya, S.
- Costanza, S.
- Dieterle, M.
- Downie, E. J.
- Drexler, P.
- Fil’kov, L. V.
- Fix, A.
- Garni, S.
- Glazier, D. I.
- Hamilton, D.
- Hornidge, D.
- Howdle, D.
- Huber, G. M.
- Jaegle, I.
- Jude, T. C.
- Kashevarov, V. L.
- Keshelashvili, I.
- Kondratiev, R.
- Korolija, M.
- Krusche, B.
- Lisin, V.
- Livingston, K.
- MacGregor, I. J.D.
- Maghrbi, Y.
- Mancell, J.
- Manley, D. M.
- Marinides, Z.
- McGeorge, J.C.
- McNicoll, E.
- Mekterovic, D.
- Metag, V.
- Micanovic, S.
- Middleton, D. G.
- Mushkarenkov, A.
- Nikolaev, A.
- Novotny, R.
- Oberle, M.
- Ostrick, M.
- Otte, P.
- Oussena, B.
- Pedroni, P.
- Pheron, F.
- Polonski, A.
- Prakhov, S.
- Robinson, J.
- Rostomyan, T.
- Schumann, S.
- Sikora, M. H.
- Sober, D.
- Starostin, A.
- Strub, Th.
- Supek, I.
- Thiel, M.
- Thomas, A.
- Unverzagt, M.
- Walford, N. K.
- Watts, D. P.
- Werthmüller, D.
- Witthauer, L.
DOIAbstract
Quasi-free photoproduction of πηπη -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 πηπη and meson-nucleon pairs, and beam-helicity asymmetries have been measured for the reactions γp→pπ0ηγp→pπ0η , γn→nπ0ηγn→nπ0η , γp→nπ+ηγp→nπ+η , and γn→pπ−ηγn→pπ−η from nucleons bound inside the deuteron. For the γpγp initial-state data for free protons have also been analyzed. Finally, the total cross sections for quasi-free production of π0ηπ0η pairs from nucleons bound in 3 He nuclei have been investigated in view of final state interaction (FSI) effects. T...
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