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Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

Authors :
Adamczewski-Musch, J.
Arnold, O.
Atomssa, E. T.
Behnke, C.
Belounnas, Amel
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.
Palka, M.
Parpottas, Yiannis
Pechenov, V.
Pechenova, O.
Petousis, Vlassis
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, Y. G.
Spataro, S.
Ströbele, H.
Stroth, J.
Strzempek, P.
Sturm, C.
Svoboda, O.
Tlusty, P.
Traxler, M.
Tsertos, Haralambos
Usenko, E.
Wagner, V.
Wendisch, C.
Wiebusch, M. G.
Wirth, J.
Zanevsky, Y.
Zumbruch, P.
Sarantsev, A. V.
Tsertos, Haralambos [0000-0001-5966-343X]
Source :
Physical Review C, Phys.Rev.C
Publication Year :
2017

Abstract

We 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, albeit with some model dependence. © 2017 American Physical Society. 95 6

Details

Database :
OpenAIRE
Journal :
Physical Review C, Phys.Rev.C
Accession number :
edsair.od......4485..35d82e48d1c06a9b9db366bbd3f353a1

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