$\Delta$(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI
- Adamczewski-Musch, J.
- Arnold, O.
- Atomssa, E.T.
- Behnke, C.
- Belounnas, A.
- Belyaev, A.
- Berger-Chen, J.C.
- Biernat, J.
- Blanco, A.
- Blume, C.
- Böhmer, M.
- Bordalo, P.
- Chernenko, S.
- Chlad, L.
- Deveaux, C.
- Dreyer, J.
- Dybczak, A.
- Epple, E.
- Fabbietti, L.
- Fateev, O.
- Filip, P.
- Finocchiaro, P.
- Fonte, P.
- Franco, C.
- Friese, J.
- Fröhlich, I.
- Galatyuk, T.
- Garzón, J.A.
- Gernhäuser, R.
- Golubeva, M.
- Guber, F.
- Gumberidze, M.
- Harabasz, S.
- Heinz, T.
- Hennino, T.
- Hlavac, S.
- Höhne, C.
- Holzmann, R.
- Ierusalimov, A.
- Ivashkin, A.
- Kämpfer, B.
- Karavicheva, T.
- Kardan, B.
- Koenig, I.
- Koenig, W.
- Kolb, B.W.
- Korcyl, G.
- Kornakov, G.
- Kotte, R.
- Kühn, W.
- Kugler, A.
- Kunz, T.
- Kurepin, A.
- Kurilkin, A.
- Kurilkin, P.
- Ladygin, V.
- Lalik, R.
- Lapidus, K.
- Lebedev, A.
- Liu, T.
- Lopes, L.
- Lorenz, M.
- Mahmoud, T.
- Maier, L.
- Mangiarotti, A.
- Markert, J.
- Maurus, S.
- Metag, V.
- Michel, J.
- Morinière, E.
- Mihaylov, D.M.
- Morozov, S.
- Müntz, C.
- Münzer, R.
- Naumann, L.
- Nowakowski, K.N.
- Palka, M.
- Parpottas, Y.
- Pechenov, V.
- Pechenova, O.
- Petukhov, O.
- Pietraszko, J.
- Przygoda, W.
- Ramos, S.
- Ramstein, B.
- Reshetin, A.
- Rodriguez-Ramos, P.
- Rosier, P.
- Rost, A.
- Sadovsky, A.
- Salabura, P.
- Scheib, T.
- Schuldes, H.
- Schwab, E.
- Scozzi, F.
- Seck, F.
- Sellheim, P.
- Siebenson, J.
- Silva, L.
- Sobolev, Yu G.
- Spataro, S.
- Ströbele, H.
- Stroth, J.
- Strzempek, P.
- Sturm, C.
- Svoboda, O.
- Tlusty, P.
- Traxler, M.
- Tsertos, H.
- Usenko, E.
- Wagner, V.
- Wendisch, C.
- Wiebusch, M.G.
- Wirth, J.
- Zanevsky, Y.
- Zumbruch, P.
- Petousis, V.
- Sarantsev, A.V.
DOIAbstract
International audienceWe report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e− and ppe+e−γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+e−γ) and Δ+→pe+e− Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is identified for the first time and the sensitivity to N-Δ transition form factors is tested. The Δ(1232) Dalitz decay branching ratio is also determined for the first time; our result is (4.19 ± 0.62 syst. ± 0.34 stat.) ×10−5, ...
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